BM1Q011FJE2 - ROHM SEMICONDUCTOR - Datasheet.Directory

Datasheet

○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays

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TSZ02201-0F1F0A200180-1-2

21.Jan.2016 Rev.001

TSZ22111・14・001

www.rohm.com

AC/DC Drivers

Quasi-Resonant Control type

DC/DC Converter IC

BM1Q011FJ

●General Description

The quasi-resonant controller typed AC/DC converter IC

BM1Q011FJ provides an optimum system for all products

that include an electrical outlet. Quasi-resonant operation

enables soft switching and helps to keep EMI low.

With MOSFET for switching and current detection

resistors as external devices, a higher degree of design

freedom is achieved.

This IC built in HV starter circuit, it contributes to low

consumption power and high speed start.

Because the burst mode is built-in and IC consumption

current is low, stand-by power becomes very low.

Because BM1Q011FJ series built-in soft-start, burst mode,

over current limiter which is cycle-by-cycle, over load

protection, over voltage protection, CS Open Protection

and so on, BM1Q011FJ are highly safety.

●Key Specifications

 Operating Power Supply Voltage Range:

: VCC：8.9V to 26.0V

VH： to 600V

 Operating Current: Normal：0.60mA (Typ.)

Burst ： 0.35mA(Typ.)

 Max frequency: 120kHz(Typ.)

 Operate temperature range: -40 to +85

●Typical Application Circuit

●Features

 Quasi-resonant method

 Built-in 650V tolerate start circuit

 Low power at the light load (burst operation)

 Maximum frequency control (120kHz)

 Frequency reduction function

 AC voltage correction function

 VCC pin : under voltage protection

 VCC pin : over voltage protection

 Over-current protection (cycle-by-cycle)

 Output driver 12V clamp circuits

 Soft start function

 ZT trigger mask function

 Over Load protection [Auto-restart]

 CS pin open protection [Auto-restart]

●Package

SOP-J7S 6.00mm × 4.90mm × 1.65mm

(Typ.) (Typ.) (Typ.)

●Applications

Air conditioner, AC adapters, TV such as the products

which need the outlet.

Figure 1. Application Circuit

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Datasheet

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TSZ02201-0F1F0A200180-1-2

21.Jan.2016 Rev.001

www.rohm.com

TSZ22111・15・001

●Absolute Maximum Ratings（Ta=25C）

Item Symbol Rating Unit Condition

Input voltage range 1 Vmax1 -0.3 ~ 30 V VCC

Input voltage range 2 Vmax2 -0.3 ~ 6.5 V FB, CS

Input voltage range 3 Vmax3 -0.3 ~ 7.0 V ZT

Input voltage range 4 Vmax4 -0.3 ~ 15 V OUT

Input voltage range 5 Vmax5 -0.3 ~ 650 V VH

OUT pin out peak current1 IOH -0.5 A

OUT pin out peak current2 IOL 1.0 A

ZT pin current1 ISZT1 -3.0 mA

ZT pin current2 ISZT2 3.0 mA

CS pin current1 ISCS1 -0.45 mA Sink current

Allowable dissipation Pd 0.675 (Note1) W

Operating temperature Topr -40 ～ +85 oC

Max junction temperature Tjmax 150 oC

Storage temperature range Tstr -55 ～ +150 oC

(Note1) When mounted on 70 mm × 70 mm × 1.6 mm (glass epoxy on single-layer substrate).

Reduce to 5.4 mW/C when Ta = 25C or above.

●Operating Conditions（Ta=25C）

Parameter Symbol Rating Unit Conditions

Power supply voltage range 1 VCC 8.9～26.0 V VCC

Power supply voltage range 2 VH 80～600 V VH

●Electrical Characteristics (Unless otherwise noted, Ta = 25C, VCC = 15 V)

Parameter Symbol Specifications Unit Conditions

MIN TYP MAX

［Circuit current］

Circuit current (ON)1 ION1 - 600 1000 uA

FB=2.0V

(Switching operation)

Circuit current (ON)2 ION2 - 350 450 uA

FB=0.5V

(Switching OFF)

Circuit current(OFF) IOFF - - 25 uA

VCC=12V , VH: open

VCC UVLO = disable

［VH pin starter］

VH Start current 1 ISTART1 0.400 0.700 1.000 mA VCC= 0V

VH Start current 2 ISTART2 1.00 3.00 6.00 mA VCC=10V

VH OFF current ISTART3 - 10 20 uA

After releasing VCCUVLO

VH pin current

VH start current switched voltage VSC 0.400 0.800 1.400 V VCC pin

［VCC pin protection］

VCC UVLO voltage1 VUVLO1 12.50 13.50 14.50 V VCC rise

VCC UVLO voltage2 VUVLO2 7.50 8.20 8.90 V VCC fall

VCC UVLO hysteresis VUVLO3 - 5.30 - V VUVLO3= VUVLO1-VUVLO2

VCC charge start voltage VCHG1 7.70 8.70 9.70 V Starter circuit

VCC charge end voltage VCHG2 12.00 13.00 14.00 V Stop voltage from VCHG1

VCC OVP voltage1 VOVP1 26.00 27.50 29.00 V VCC rise

VCC OVP voltage2 VOVP2 - 23.50 - V VCC fall

VCC OVP hysteresis VOVP3 - 4.00 - V

［OUT pin］

OUT pin H voltage VOUTH 10.5 12.5 14.5 V IO=-20mA, VCC=15V

OUT pin L voltage VOUTL - - 0.30 V IO=+20mA

OUT pin Pull-down resistor RPDOUT 75 100 125 kΩ

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TSZ02201-0F1F0A200180-1-2

21.Jan.2016 Rev.001

www.rohm.com

TSZ22111・15・001

●IC control unit Electrical Characteristics (Unless otherwise noted, Ta = 25C, VCC = 15 V)

Parameter Symbol Specifications Unit Conditions

MIN TYP MAX

[ DC/DC converter unit （Turn-off）]

Pull-up resistor of FB pin RFB 22.5 30.0 37.5 kΩ

CS over current voltage 1A Vlim1A 0.475 0.500 0.525 V FB=2.2V (ACSNS＝L)

CS over current voltage 1B Vlim1B 0.310 0.350 0.390 V FB=2.2V (ACSNS＝H)

CS over current voltage 2A Vlim2A - 0.125 - V FB=0.5V (ACSNS＝L)

CS over current voltage 2B Vlim2B - 0.088 - V FB=0.5V (ACSNS＝H)

Voltage gain1

（∆VFB/∆VCS） AVCS1 3.40 4.00 4.60 V/V ACSNS＝L

Voltage gain 2

（∆VFB/∆VCS） AVCS2 4.86 5.71 6.57 V/V ACSNS＝H

ZT current switched CS 1 IZT1 0.93 1.00 1.07 mA

ZT current switched CS 2 IZT2 0.82 0.90 0.98 mA

ZT current hysteresis

switched CS voltage IZTHYS - 0.10 - mA

CS Leading Edge Blanking time TLEB - 0.250 - us

Turn-off time TOFF - 0.150 - us

Minimum ON width Tmin - 0.400 - us TLEB＋TOFF

Maximum ON width Tma

30.0 39.0 50.7 us

[ DC/DC converter unit （Turn-on）]

ZT input current 1 IZT1 4 14 24 uA OUT=L, ZT=4.65V

ZT input current 2 IZT2 6 16 26 uA OUT=L, ZT=5.00V

ZT input current 3 IZT3 8 18 28 uA OUT=L, ZT=5.35V

Max frequency 1 FSW1 108 120 132 kHz FB=2.0V

Max frequency 2 FSW2 - 30 - kHz FB=0.5V

Frequency reduction start

voltage VFBSW1 1.10 1.25 1.40 V

Frequency reduction end voltage VFBSW2 0.42 0.50 0.58 V

ZT comparator voltage1 VZT1 60 100 140 mV ZT fall

ZT comparator voltage2 VZT2 120 200 280 mV ZT rise

ZT trigger mask time TZTMASK - 0.6 - us

In OUT H ->L,

prevent noise

ZT trigger Timeout1 TZTOUT1 10.5 15.0 19.5 us Without bottom detection

ZT trigger Timeout2 TZTOUT2 3.5 5.0 6.5 us Count from final ZT trigger

[DC/DC protection ]

Soft start time1 TSS1 0.35 0.50 0.65 ms

Soft start time 2 TSS2 0.70 1.00 1.30 ms

Soft start time 3 TSS3 1.40 2.00 2.60 ms

Soft start time 4 TSS4 2.80 4.00 5.20 ms

FB Burst voltage VBURST 0.42 0.50 0.58 V

FB OLP voltage a VFOLP1A 2.6 2.8 3.0 V FBOLP detect（FB rise）

FB OLP voltage b VFOLP1B - 2.6 - V FBOLP detect（FB fall）

FB OLP detection timer TFOLP 44.8 64 83.2 ms

FBOLP stop timer TOLPST 358 512 666 ms

Latch mask time TLATCH 50 100 200 ms

* Definition of ACSNS (L : ZT current < IZT1 、H : ZT current > IZT1)

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Datasheet

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TSZ02201-0F1F0A200180-1-2

21.Jan.2016 Rev.001

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TSZ22111・15・001

●Pin Configuration

Table 1 Input-Output PIN Function

NO. Pin Name I/O Function ESD Diode

VCC GND

1 ZT I Zero current detect pin - ○

2 FB I Feedback signal input pin ○ ○

3 CS I Primary current sensing pin ○ ○

4 GND I/O GND pin ○ -

5 OUT O External MOS drive pin ○ ○

6 VCC I/O Power supply pin - ○

7 VH I Starter circuit pin - ○

● External Dimensions

Figure 2. SOP-J7 package external dimensions

●I/O Equivalent Circuit Diagram

Figure 3. I/O Equivalent Circuit Diagram

(TOP VIEW)

OUT

GND

VCC

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TSZ02201-0F1F0A200180-1-2

21.Jan.2016 Rev.001

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●Block Diagram

OSC

Figure 4. Block Diagram

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TSZ02201-0F1F0A200180-1-2

21.Jan.2016 Rev.001

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●Description of Blocks

(1-1) Starter Circuit VH pin（7pin）

The IC builds in starter circuit (tolerates 650V) to VH pin (8pin). It enables to be low standby power and high speed

starting. The operating current is shown in Figure 6. After starting the IC, the idling current ISTART3（typ=10uA） flows

from VH voltage. The loss by the idling current is shown below.

ex) power consumption of starter circuit only

Vac=100V Power＝100V*√2*10uA=1.41mW

Vac=240V Power＝240V*√2*10uA=3.38mW

Starting time is decided by VH current and VCC pin capacitor value. The reference value of starting time is shown in

Figure 7.

For example, VCC pin is charged within about 0.1 sec at CVCC=10uF. When the VCC pin is shorted to GND, the

current of ISTART1 flows to (shown in Figure 6). When the VH pin is shorted to GND, the large current flows from VH

line to GND. To prevent this, it is needed to insert the resistor (5kΩ~60kΩ) for limiting current between the VH line and

the VH pin. When VH pin is shorted to GND, the power of VH2/RVH is applied to this resistor, so please decide the

resistor value depending on specifications after having confirmed allowable electricity.

Figure 5. Starter Block Diagram

Figure 6. Start-up Current vs. VCC Voltage Figure 7. Start-up Time（example）

*The start up current is flown from VH pin (7Pin).

VCC Capacitor value [uF]

VCC Capacitor value – startup time

Start time

[

]

VCCUVLO

VCC

Cvcc

FUSE

Diode

Bridge

SW1

Input

Rvh

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TSZ02201-0F1F0A200180-1-2

21.Jan.2016 Rev.001

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TSZ22111・15・001

Figure 8 shows operation waveform of start-up.

Secondary

output

Switing

Voltage

VCC(5pin)

VH input

current

ABC

VUVLO1

ISTART1

ISTART3

ISTART2

Set voltage

VSC

Figure 8. Start-up Waveform

A: By inserting to outlet, the VH voltage applies. From this moment, charging to VCC pin starts from the VH pin through

starter circuit. At the time, due to VCC < VSC (typ=0.8V), VH input current is limited to ISTART1 by the VCC pin short

protection function.

B: Because of VCC voltage > VSC (typ=0.8V), VCC short protection is released and the current of the VH input current

waveform flows from VH pin.

C: Because of VCC voltage > VUVLO1 (typ=13.5V), the start-up circuit stops and VH input current is limited to ISTART3

(typ=10uA) only. Furthermore, for starting switching operation secondary output starts to rise however the VCC pin

voltage lowers because the Secondary output is low yet. The falling rate of the VCC is determined by the VCC pin

capacitance, the consumption current of the IC and the load current that flows from the VCC pin. (V/t = Cvcc/Icc)

D: Because secondary output has risen to specific voltage, the VCC pin is applied from the auxiliary winding and VCC

voltage is stabilized.

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TSZ02201-0F1F0A200180-1-2

21.Jan.2016 Rev.001

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(1-2) a case without using VH pin

This IC is also possible to start by connecting the start-up resistor to the VCC pin in the open start-up circuit (650V

breakdown voltage) of the VH pin. The structure that does not use the recharge function is shown in Figure 9.At

start-up (before VCC VULO released), please be careful to set the start-up resistor Rstart shown in Figure 9, because

the consumption current IOFF (Max=25uA) flows from VCC pin (6pin).

Figure 9. Application Circuit without using the VH pin

・How to set the start-up resistance

Start-up resistor Rstart shown in Figure 9 is necessary for the IC to start if you do not use the VH pin. If the value of

Rstart is small, the standby power is increased and the start-up time becomes shorter. Adversely, if the value of Rstart

is big, the standby power is reduced and start-up time becomes longer. When the VCC voltage=12V, the standby

current IOFF is 25μA (max) and the VCC UVLO voltage VUVLO1 is 14.5V (max).

ex） The example of start-up resistor Rstart setting

Rstart = (VH min - VUVLO1（max）) / IOFF（max）

In Vac=100V, if margin is -30%, VH min=100×√2×0.7=99V

VUVLO1（max）=14.5V, so Rstart = (99-14.5) / 25μA＝3.38MΩ

For an example, with a sufficient margin to 3.38MΩ, the Rstart is set to 2.0MΩ.In case of AC100V, Power consumption

in Rstart is below.

Pd (Rstart) = (VH-VCC)2/Rstart = (141V-14.5V) 2/2.0M = 8.00mW

Pd in using start-up resistor is more than in using VH pin. However, about the value of VCC pin capacitance and VCC

start-up resistor, please confirm by performing the evaluation of the actual application.

Rstart

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Datasheet

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TSZ02201-0F1F0A200180-1-2

21.Jan.2016 Rev.001

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(2) Start Sequence (Soft start, Light load operation, Auto recovery in over load protection)

The start sequence of IC is shown in Figure 10. About each detail, explain in each section.

Figure 10. Start Sequence Time Chart

A: The voltage is applied to the Input voltage VH pin (7pin).

B : VCC pin (6pin) voltage rise, when VCC＞VUVLO1（typ=13.5V）, IC starts operating. In the case that protection

function is normal condition, the IC starts switching operation. Then the VCC pin voltage drops absolutely by the

VCC pin consumption current. In case of the VCC< VCHG1 (typ =8.7V), the starting circuit operates and charges the

VCC. After starting to charge, it lasts charging until VCC> VCHG1 (typ =13.0V)

C: The IC has a soft start function which regulates the voltage level at the CS pin to prevent a rise in voltage and

current.

D: When the switching operation starts, the secondary output voltage VOUT rises. After starting switching, it is

necessary to set the output voltage to stable the due output voltage within the TFOLP (typ=64ms) period.

E: At light load condition, the burst operation starts for keeping power consumption low.

F: When it is heavy load, FB pin voltage (2pin) is larger than VFOLP1A (typ=2.8V), because output voltage is down.G:

When the condition that FB pin (2pin) voltage is more than VFOLP1A (typ=2.8V) continues for T FOLP (64ms typ), the

switching is stopped by the over load protection for TOLPST (typ=512ms). When the FB pin (2pin) voltage becomes to

be lower than VFOLP1B, the timer internal the IC T FOLP (64ms typ) is reset.

H: When VCC voltage (6pin) is less than VCHG1 (typ=8.7V), the starter circuit starts to operate and charge the VCC pin

(6pin) .

I : When VCC voltage (6pin) is more than VCHG2 (typ =13.0V), the starter circuit stops to charge to the VCC pin (6pin).

J: Same as F.

K: Same as G.

Vout

Switching

VH(7pin)

VCC(6pin) 13.5V

FB(2pin)

Soft

Start

Iout

Normal Load

Light LOAD

Within 44.8ms

VCC=8.5V

Over Load

Internal REF

Pull Up

Burst mode

2.8V

ABCDEFGHIJK

64msec

64ms

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Datasheet

BM1Q011FJ

TSZ02201-0F1F0A200180-1-2

21.Jan.2016 Rev.001

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TSZ22111・15・001

(3) VCC pin (6pin) Protection Function

The IC built in VCC UVLO (Under Voltage Protection) function, VCC OVP (Over Voltage Protection) function and

VCC charge function which operates when the VCC voltage drops.VCC UVLO and VCC OVP are the function that

prevents MOSFET for switching from destroying at the VCC voltage low or high conditions. And the VCC charge

function charges in high voltage line from starting circuits and stabilize the secondary output voltage.

(3-1) VCC UVLO / VCC OVP Function

VCC UVLO is the function monitors the VCC pin voltage and switches ON/OFF of the IC. This function has a voltage

hysteresis and it is auto recovery protection type. VCC OVP is also the type. Refer to the operation figure 11. The auto

recovery protection function of this IC’s VCC OVP stops the switching when the condition that the VCC pin (6pin)

voltage is more than VOVP1 (typ=27.5V) continues for more than mask time TSTOP (typ=100us). And it restarts switching

when the condition that VCC pin (6pin) voltage is lower than VOVP2 (typ=23.5V).

Figure 11. VCC UVLO / OVP Timing Chart

A: The VH (7pin) voltage is applied, and the VCC (6pin) voltage starts rising.

B: The VCC pin (6pin) voltage > VUVLO1, the VCC UVLO function is released and DC/DC operation starts.

C: The VCC pin (6pin) voltage >VOVP1, VCCOVP detects the over-voltage in the IC.

D: When the condition that the VCC (6pin) voltage is more than VOVP1 continues for TSTOP (typ =100us), switching is

stopped by the VCCOVP function.

E: The VCC (6pin) voltage < VCHG1, the VCCOVP function is released and the operation is restarted.

F: The high voltage line VH drops.

G: The VCC voltage < VUVLO2, VCCUVLO function starts operation and the switching is stopped.

H: The high voltage line VH is applied.

I: The VCC pin (6pin) becomes more than VUVLO1 and VCCUVLO function operates.

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TSZ02201-0F1F0A200180-1-2

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・Regarding capacitor value of VCC pin

For stable operation of the IC, please set the capacitor value to 1uF or higher of the VCC pin. When the VCC

capacitor terminal is too large, the response of the VCC pin to the Secondary output is slows down. Additionally,

if the degree of the transformer coupling is low, since a large surge occurs to the VCC pin, the IC may be

destroyed. In this case, it is necessary that a resistor which is from 10Ω to 100Ω is attached to the path between

the capacitor and diode at the back of the auxiliary winding or the capacitor of the VCC pin is increased. And the

fixed number is has to be set the VCC pin surge voltage not to exceed the absolute maximum rating of the VCC

pin by evaluating the waveform of the VCC pin.

・Regarding VCC OVP voltage protection setting method in case of rising Vout (secondary output)

The VCC pin voltage is determined by the transformer ratio (Np:Ns) and Vout (Secondary output). Therefore,

when the Secondary output becomes large, it is possible to protect the IC by VCCOVP. Setting method of

VCCOVP protection is shown below.

Figure 12. How to Set VCCOVP

The VCC voltage is determined by the formula below.

VCC voltage = (Vout-VFs)×Nb/Ns -VFb

(Vout: Secondary output, Nb: Number of auxiliary winding, Ns: Number of secondary winding

VFx: Secondary diode VF, VFb: auxiliary winding diode VF)

If you want to apply protection when it becomes Secondary output × 1.3, please set the number of turns to be the next

formula. 1.3 × (Vout × (Nb/Ns) - VF) > VOVP1

Because VCCOVP protection has a blanking time of TSTOP (typ = 100us), it is not detected for momentary surge noise

of the VCC pin. However, VCCOVP is detected when the VCC voltage becomes higher than VOVP1 for the period of

more than VSTOP. So it is necessary to check in application evaluation when you set VCCOVP.

Vout

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Datasheet

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(3-2）VCC Recharge Function

After the VCC (6pin) voltage > VUVLO1, the IC start to operate. After that, when the VCC pin voltage < VCHG1, VCC

charge function operates. Then the IC charges the VCC pin (6pin) from the VH pin through the starting circuits. This

operation prevents the IC from the VCC starting errors. After the VCC pin (6pin) is charged and rise to more than VCHG2,

the charging is stopped. This operation is shown to Figure 13.

Figure 13. VCC pin Charge Operation

A: As the VH pin voltage (7pin) rises, the VCC pin (6pin) is started to charge by the VCC charge function.

B: The VCC pin (6pin) voltage > VUVLO1, VCC UVLO function is released, VCC charge function is stopped, DC/DC

operation start.

C: The VCC pin (6pin) voltage is dropped because OUTPUT voltage is low at starting.

D: The VCC pin (6pin) voltage < VCHG1, the VCC charge function operates and VCC pin (6pin) voltage rises.

E: The VCC pin (6pin) voltage > VCHG2, the VCC charge function stops.

F: The VCC pin (6pin) voltage < VCHG1, the VCC charge function operates and VCC pin (6pin) voltage rises.

G: The VCC pin (6pin) voltage > VCHG2, the VCC charge function stops.

H: The output voltage stops stating operation and the VCC pin is charged from auxiliary winding. Then the VCC pin

(6pin) becomes to be stable.

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Datasheet

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21.Jan.2016 Rev.001

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(4) DC/DC Driver

The IC operates in PFM (Pulse Frequency Modulation) mode method. By monitoring the FB pin (2pin), ZT pin (1pin)

and CS pin(3pin), the IC supply optimum system for DC/DC operation. The IC controls ON width (Turn Off) of the

switching MOSFET by the FB pin (2pin) and CS pin (3pin). The IC also does OFF width (Turn ON) by the ZT pin (1pin).

The detail is shown below.

(4-1) QR-basic Operations

The QR basic block diagram and the basic operation are shown in Figure 14 and 15.

Figure 14. DC/DC Operation Block

OSC

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21.Jan.2016 Rev.001

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Figure 15. QR Basic Operation

About Figure 15

A: The IC detects a bottom signal and outputs SET signal. Then it turns ON the MOSFET. At this moment, a noise

occurs at the CS pin because the capacitor between DRAIN and SORCE of MOSFET is discharged. This noise is

called Leading Edge. And this IC has an internal filter for this noise (Refer to (4-3)). This filter and delay time make

the minimum pulse of the IC 400ns (typ). After that, the current flows to the MOSFET and the voltage (Vcs=Rs*Ip)

applies to the CS pin.

B: If the CS pin voltage rises to more than the FB pin voltage / Gain (typ=4) or over current detection voltage VCS

(typ=0.5V), the IC outputs the RESET signal and turns OUT off.

C: It takes delay time Tondelay until the IC turn off from point B. For this time, the maximum electric power increases

depending the AC voltage. This IC has the function that restricts the increment (Refer to (4-4)).

D: The DRAIN voltage drops because the energy stocked in transformer is discharged to secondary side and there is

no energy in it. At this moment, the IC detects a bottom signal but the signal is ignored not to exceed the maximum

frequency. Then the auto vibration of the transformer Lp and MOSFET Cds (the capacitor between the DRAIN and

SORCE) starts.

E: After the specific period passes from the point A and the time which determined by the maximum frequency also

passes, the SET signal is outputs if the IC detects a bottom and turns MOSFET on.

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Datasheet

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TSZ02201-0F1F0A200180-1-2

21.Jan.2016 Rev.001

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(4-2) Determination of ON Width（Turn OFF）

ON width is controlled by FB (2pin) and CS (3pin).By comparison between the FB pin voltage divided by AVcs (typ=4)

and CS pin voltage, the IC decides ON width. Besides, by comparison with Vlim1 (typ=0.5V) voltage which is

generated in the IC, the CS comparator level is changed lineally to be shown in Figure 16 (the bottom side). Then the

maximum frequency also changes. The CS pin (3pin) is shared with over current limiter circuit by pulse. The IC

changes the maximum blanking frequency and over current limiter level by the FB pin (2pin) voltage.

mode1: Burst operation

mode2: Frequency reduction operation（reduce max frequency）

mode3: Max frequency operation (operate at maximum frequency)

mode4: Over load operation（stop the pulse operation detecting the over load condition）

Figure 16. relation of the FB pin, over current limiter and maximum frequency

The ON width Ton is decided by the CS Limiter level (VCS).

Ton = (Lp*Vcs) / (Vin*RS)

Lp: primary inductance value, Vin: VH voltage (Figure 14), RS: Sense resistor (Figure 14)

To adjust over current limiter level, the IC switches the soft start function and over current protection at input voltage. In

this case, the value of Vlim1 and Vlim2 is changed as below.

Table 2. Over current protection voltage Detail

Soft start AC=100V AC=230V

Vlim1 Vlim2 Vlim1 Vlim2

start～0.5ms 0.063V (12%) 0.016V (3%) 0.044V (10%) 0.011V (2%)

0.5ms～1ms 0.125V (25%) 0.032V (6%) 0.088V (20%) 0.022V (4%)

1ms～2ms 0.250V (50%) 0.063V (12%) 0.175V (40%) 0.044V (9%)

2ms～4ms 0.375V (75%) 0.094V (19%) 0.263V (60%) 0.066V (13%)

4ms～ 0.500V (100%) 0.125V (25%) 0.350V (70%) 0.088V (18%)

*(percent) is shown the comparative related value with Vlim1（typ=0.5V）in normal operation.

The reason that distinguish between AC100V and AC230V is by CS over current protection voltage switch function

which is shown to（4-4）.

FB [V]

MAX Fsw[kHz]

0.5V 1.25V

30kHz

120kHz

0.0V 2.0V

mode1 mode2 mode3

2.8V

mode4

FB [V]

0.5V0.0V 2.0V

mode1 mode2 mode3

2.8V

mode4CS 　Limiter[V]

Vlim1

Vlim2

1.25V

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TSZ22111・15・001

(4-3) LEB（Leading Edge Blanking） Function

When a MOSFET for switching is turned ON, a surge current occurs in cause of a capacitance or rush current.

Therefore, when the CS (3pin) voltage rises temporarily, an over current limiter circuit may miss detections. To prevent

miss detections, the IC build-in blanking function which mask for TLEB （typ=250ns） from switching the OUT pin(5pin)

from L to H. This blanking function enables to reduce noise filter of the CS pin (3pin). However, when the CS pin noise

does not converge less than 250ns, it is needed to attach RC filter to the CS pin shown in Figure 17. Then, a delay

time occurs to the CS pin detection by RC filter. Also, even if the filter in not attached, it is recommended that it is

attached an Rcs resistor to the CS pin as a surge provision. Rcs recommended resistor value is about 1kΩ. If you

would like to filter, please adjust in Ccs for this resistor.

Figure 17. a circuit surrounding the CS pin

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21.Jan.2016 Rev.001

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(4-4) CS over Current Protection Switching Function

If the input voltage (VH) becomes higher, the slope of L current raises. The switching has a constant delay time, so

the maximum allowable power increases for a constant over current limiter depending AC voltage. For this

countermeasure, this IC switches the internal over current protection function monitoring the input voltage. In case of

high voltage (AC230V), it is needed to set the over current comparator to normal 0.7 times. The IC detects by

monitoring the ZT inflow current and switching. When the MOSFET is turns ON, Va becomes minus voltage depending

on the input voltage (VH). The ZT pin (1pin) cramps near 0V internal the IC. The way to determine Rzt1, Rzt2 and Czt

is below. The block diagram is shown in Figure 18. The graph is also shown in Figure 19 and 20.

Izt1 = (Va－Vzt) / Rzｔ1 ≒ Va / Rzｔ1 = VH * Na/Np /Rzｔ1

Rzt1 = Va / Izt1

Va: the auxiliary winding voltage (switching plus/minus) At deciding Rzt1, it should be determined from minus

voltage value, and deciding Rzt2, it should be done from plus voltage value.

Izt1: the current that flows to the ZT pin Vzt: the ZT pin voltage

As the formula, Rzt1 is has to be set to the value that is divided by 1zt (typ=1mA) for the auxiliary winding Va under

the AC voltage condition which the IC is going to switch the over current detection level. Secondly, the timing of turning

on is has to be set by Czt to operate the ZT pin bottom detection at the moment that the Drain voltage of MOSFET is

0V. Finally, Rzt2 is also has to set the maximum ZT pin voltage is around 1 to 3V for the plus voltage of the auxiliary

winding. (The noises are piled up to the ZT pin so the value of maximum voltage has been set considering a margin.)

For that, Rzt2 is calculated as below. (In the case of setting in 2V)

VZT = Va×Rzt2/(Rzt1+Rzt2) < 2V => Rzt2 < 2×Rzt1 / (Va-2)=2×Rzt1/(Na/Ns×(Vout-VFs)-2)

The auxiliary winding voltage Va has to be calculated in the plus voltage at maximum loads. In addition, the CS over

current protection switching ZT current has the hysteresis of IZTHYS (typ=0.1mA).

Figure 18. CS over Current Detection Switched ZT current block diagram

NOUT

Leading Edge

Blanking

Timer

(64ms)

FBOLP_OH

100mV

/200mV

1 shot

AND

ZT Blanking

OUT(H->L)

0.60us NOUT

AND

AND PRE

Driver

POUT

FB/4

0.50V

CURRENT SENSE (V-V Change)

Normal : ×1.0

FBOLP_OH

Max frequency

control

0.5V

300kΩ

100kΩ

Soft Start

30k

1ms

4ms

NOUT

TimeOut

15 usec

5 usec

12V Clamp

Circuit

1MΩ

2ms

0.5ms

AND

SET

RESET

Timer stop

(512ms)

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TSZ22111・15・001

Izt[mA]

1.0mA

Limiter[V]

Vlim1

Vlim1*0.7

0.9mA

Figure 19. FB pin Voltage vs. CS pin Voltage Characteristics Figure 20 Izt Current vs Switched CS Voltage Characteristics

ex) a setting method （Switching between AC100V and AC230V ）

AC100V: 141V±42V（±30% margin）

AC230V: 325V±65V（±20% margin）

The winding numbers of transformer are: Np = 100, Na = 15, Ns =20

According to above, when the IC switches the CS detection current between VH: 182 ~ 260V, in case of switching the

AC voltage at VH = 214V (AC150V) the minus voltage Va at MOSFET of QR turn on is calculated as below.

Va = Vin*Na / Np = 214V*15 / 100 *(-1) = -32.1

Rzt1 = Va / I

ZT = -32.1V/-1mA = 32.1kΩ

According to this, Rzt1 is set to 33kΩ. At this time, according to Rzt2=2×33k/(20/15×19-2)=2.83kΩ, Rzt2 is also set to

3kΩ. Czt is set to the value which turns on MOSFET when the Drain voltage is minimum voltage after having checked

the operation in the actual applications.

VH[V]

214V

Limiter[V]

Vlim1

Vlim1*0.7

192V

Figure 21 CS switching example VH voltage – CS voltage characteristics

(4-5) Determination of OFF Width（Turn on）

The OFF width is controlled at the ZT pin. While the switching is OFF, the IC supplies the electric power which is

stored at coils to the secondary output capacitor. After supplying, the DRAIN pin is drops because the current doesn’t

flow to the secondary side. For that, the voltage of auxiliary winding side also drops. The voltage divided by Rzt1 and

Rzt2 applies to the ZT pin (1pin). If the voltage level drops to less than VZT1 (typ =100mV), the IC turns on the OUT pin.

To detection the zero current at the ZT pin (1pin), Czt, Rzt1 and Rzt2 makes time constant. However, the bottom

time is adjusted by Czt because Rzt1 and Rzt2 needs to be set by the AC voltage correct function (4-3).

Toff1=Ls/(Vout+VF)*Is (Toff1 : transformer discharge time、Ls : secondary inductance 、Vout : Secondary output、

VF：secondary diode forward voltage、Is：secondary peak current）

For that, switching frequency is calculated below:

switching frequency=1 / {transformer charge and discharge time(Ton+Toff1) + (bottom-1/2) × resonant time }

resonance time = 1 / (2×π×Lp×Cds)

＊Lp: primary inductance , MOSFET D-S capacitor : Cds

Because a frequency reduction range in light load is restricted shown in Figure 16, bottom detection operates by the

frequency which is lower than max frequency function in Figure 16.Additionally, the ZT trigger mask function (4-6) and

a ZT timeout function (4-7) are built in IC.

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(4-6) ZT Trigger Mask Function（Figure 22）

When switching is set from ON to OFF, superposition of noise may occur at the ZT pin. Then, the ZT comparator and ZTOVP

comparator are masked for the TZTMASK time to prevent ZT comparator operation errors. In addition, taking a surge withstand

pressure into consideration, the ZT voltage set by resistor divided is has to be set within 3V for the auxiliary winding voltage.

Figure 22 ZT Trigger Mask Function

A: DC/DC OFF=>ON

B: DC/DC ON=>OFF then the surge noise occurs to ZT pin.

C: Since a noise occurs to ZT pin, the IC masks ZT comparator and ZTOVP comparator detection for TZTMASK time.

(4-7-1) ZT Timeout Function1 （Figure 23）

When the ZT pin voltage is not higher than VZT2 (typ=200mV) for TZTOUT1 (typ=15us) such as start or low output voltage or ZT

pin short, the IC turns on MOSFET by force.

(4-7-2) ZT Timeout Function2 （Figure 23）

After ZT comparator detects bottom, when the IC does not detect next bottom within TZTOUT2（typ =5us）, it turns on MOSFET by

force. After ZT comparator detects bottom at once, the function operates. For that, it does not operate at start or at low output

voltage. When the IC is not able to detect bottom by decreasing auxiliary winding voltage, the function operates.

Figure 23 ZT Timeout Function

A: At starting up, the IC starts to operate by ZT timeout function1 because of ZT=0V.

B: MOSFET turns ON.

C: MOSFET turns OFF.

D: ZT voltage is lower than VZT2 (typ=200mV) by ZT dump decreasing.

E: MOSFET turns ON by ZT timeout fucntion2 after TZT2 (typ=5us) from D point.

F: ZT voltage is lower than VZT2 (typ=200mV) by ZT dump decreasing.

G: MOSFET turns ON by ZT timeout fucntion2 after TZT2 (typ=5us) from F point.

H: ZT pin is short to GND.

I : MOSFET turns ON by ZT timeout function1 after TZTOUT1 (typ=15us).

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(5) Soft Start Sequence

Normally, when the AC voltage is applied, a large current flows to raise the output voltage. This IC has a built-in soft

start function to prevent the output voltage and current from large change. This function is reset when the VCC pin

(6pin) drops to less than VUVLO2 (typ=8.2V), and it performs at next applying. It operates as below after starting up.

(Refer to the article of (4)-1 turn off.)

・start ～ 0.5ms => Set CS limiter to 12.5% of normal operation.

・0.5ms～1ms => Set CS limiter to 25% of normal operation.

・1ms～2ms => Set CS limiter to 50% of normal operation.

・2ms～4ms => Set CS limiter to 75% of normal operation.

・4ms～ => normal operation

(6) CS (3pin) Open Protection

If the CS (3pin) is open, to prevent the OUT pin from making a error, the IC builds in the CS (3pin) open protection.

When the CS (3pin) is open, the OUT pin (5pin) switching is stopped by the function. (This is auto-recovery)

NOUT

Leading

Edge

Blanking

OUT

PRE

Driver

POUT

CURRENT SENSE

(V-V Change)

Normal : ×1.0

FBOLP_OH

VREF(4V)

1MΩ

VCCOVP

AND

Timeout

Bottom det

Figure 24. CS Open Protection

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TSZ22111・15・001

(8) OUTPUT Over Load Protection（FB OLP comparator）

The over load protection is the function that monitors the condition of the secondary output current’s over load and fixes the

OUT pin (5pin) to Low at an over load condition. At a over load condition, there is no current in a photocoupler so the FB pin

(2pin) rise to near 3.7V. When the condition continues for TFOLP （typ =64ms）, the IC judges this is over load state and the OUT

pin (5pin) is fixed to L. If the FB pin (2pin) drops to VFOLP1B (typ =2.6V) within TFOLP (typ =64ms) from the moment that its voltage

becomes higher VFOLP1A (typ =2.8V), the over load protection timer is reset. At starting up, the FB pin starts to operate from

more than VFOLP1A (typ =2.8V) voltage because it is pull-up by a resistor to internal voltage. For this reason, the starting up time

of the secondary output voltage is has to be set within TFOLP (typ =64ms) from starting up.

After detecting the over load condition, the IC is stopped for TOLPST (typ =512ms) and the IC operates auto-recovery. At this

moment, the IC operates soft start. At stopping, although the VCC voltage drops, the VCC pin voltage keeps more than VUVLO2

because it is charged from starting circuits.

VCC

VUVLO1

VUVLO2

VCHG1

Switching

FB VFOLP1A

64ms 64ms

512ms

VH charge

chargecharge

512ms

VCHG2

ABC

DEFGH

Figure 25. Over Load Protection: Auto-recovery

A: When FB voltage is over VFOLP1A, FBOLP comparator detects an over load state.

B: When the state A continues for TFOLP (typ=64ms), the IC stops switching by over load protection.

C: During stopping switching by over load protection, VCC (6pin) voltage drops. When VCC (6pin) voltage is lower than

VCHG, VCC re-charge function operates and the VCC (6pin) voltage is up.

D: When the VCC (6pin) voltage is higher than VCHG2 by re-charge function, VCC recharge function is stopped.

E: It passes for TOLPST (typ =512ms) from B, the IC starts switching with soft start.

F: When over load state continues, the FB (2pin) voltage is over VFOLP1A. When it passes for TFOLP (typ=64ms) from E,

the IC stops switching.

G: During stopping switching by over load protection, the VCC (6pin) voltage drops. When the VCC (6pin) voltage is

lower than VCHG, VCC re-charge function operates and the VCC (6pin) voltage is up.

H: When the VCC (6pin) voltage is higher than VCHG2 by re-charge function, VCC recharge function is stopped.

(9) OUT (5pin) Voltage Clamp Function

For the purpose which protects the external MOSFET, H level of the OUT (5pin) is clamped to VOUTH (typ=12.5V). It

prevents gate destruction of MOSFET by raising the VCC (6pin) voltage. (Refer to Figure 23) The OUT (5pin) is

pulled-down RPDOUT (typ=100kΩ).

NOUT

PRE

Driver

POUT

12V Clamp

Circuit

Figure 26. OUT (5pin) Construction

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TSZ22111・15・001

●Operation Mode of Protection Circuit

Operation mode of protection functions are shown in table3.

Table 3. Operation Mode of Protection Circuit

Item Protection mode

VCC Under Voltage Locked Out Auto recovery

VCC Over Voltage Protection Auto recovery (with 100us timer)

FB Over Load Protection Auto recovery (delay: 64ms, stop: 512ms)

CS Open Protection Auto recovery

ZT Over Voltage Protection -

VCC Charge Protection Auto recovery

● Power Dissipation

The thermal design should set operation for the following conditions.

(Since the temperature shown below is the guaranteed temperature, be sure to take a margin into account.)

1. The ambient temperature Ta must be 85 or less.

2. The IC’s loss must be within the allowable dissipation Pd.

The thermal abatement characteristics are as follows.

(PCB: 70 mm × 70 mm × 1.6 mm, mounted on glass epoxy substrate)

Figure 27. SOP-J8 Thermal Abatement Characteristics

100

200

300

400

500

600

700

800

900

1000

0 25 50 75 100 125 150

Ta[℃]

Pd[mW]

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TSZ22111・15・001

●Operational Notes

(1) Absolute maximum ratings

Damage may occur if the absolute maximum ratings such as for applied voltage or operating temperature range are

exceeded, and since the type of damage (short, open circuit, etc.) cannot be determined, in cases where a particular

mode that may exceed the absolute maximum ratings is considered, use of a physical safety measure such as a

fuse should be investigated.

(2) Power supply and ground lines

In the board pattern design, power supply and ground lines should be routed so as to achieve low impedance. If there

are multiple power supply and ground lines, be careful with regard to interference caused by common impedance in

the routing pattern. With regard to ground lines in particular, be careful regarding the separation of large current routes

and small signal routes, including the external circuits. Also, with regard to all of the LSI’s power supply pins, in

addition to inserting capacitors between the power supply and ground pins, when using capacitors there can be

problems such as capacitance losses at low temperature, so check thoroughly as to whether there are any problems

with the characteristics of the capacitor to be used before determining constants.

(3) Ground potential

The ground pin’s potential should be set to the minimum potential in relation to the operation mode.

(4) Pin shorting and attachment errors

When attaching ICs to the set board, be careful to avoid errors in the IC’s orientation or position. If such attachment

errors occur, the IC may become damaged. Also, damage may occur if foreign matter gets between pins, between a pin

and a power supply line, or between ground lines.

(5) Operation in strong magnetic fields

Note with caution that these products may become damaged when used in a strong magnetic field.

(6) Input pins

In IC structures, parasitic elements are inevitably formed according to the relation to potential. When parasitic

elements are active, they can interfere with circuit operations, can cause operation faults, and can even result in damage.

Accordingly, be careful to avoid use methods that enable parasitic elements to become active, such as when a voltage

that is lower than the ground voltage is applied to an input pin. Also, do not apply voltage to an input pin when there is no

power supply voltage being applied to the IC. In fact, even if a power supply voltage is being applied, the voltage applied

to each input pin should be either below the power supply voltage or within the guaranteed values in the electrical

characteristics.

(7) External capacitors

When a ceramic capacitor is used as an external capacitor, consider possible reduction to below the nominal

capacitance due to current bias and capacitance fluctuation due to temperature and the like before determining

constants.

(8) Thermal design

The thermal design should fully consider allowable dissipation (Pd) under actual use conditions.

Also, use these products within ranges that do not put output Tr beyond the rated voltage and ASO.

(9) Rush current

In a CMOS IC, momentary rush current may flow if the internal logic is undefined when the power supply is turned ON,

so caution is needed with regard to the power supply coupling capacitance, the width of power supply and GND pattern

wires, and how they are laid out.

(10) Handling of test pins and unused pins

Test pins and unused pins should be handled so as not to cause problems in actual use conditions, according to the

descriptions in the function manual, application notes, etc. Contact us regarding pins that are not described.

(11) Document contents

Documents such as application notes are design documents used when designing applications, and as such their

contents are not guaranteed. Before finalizing an application, perform a thorough study and evaluation, including for

external parts.

Status of this document

The Japanese version of this document is formal specification. A customer may use this translation version only for a reference

to help reading the formal version.

If there are any differences in translation version of this document formal version takes priority

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TSZ22111・15・001

●Ordering Information

B M 1 Q 0 1 1 F J - E 2

Product name

Package

Packaging and

forming specification

E2: Embossed tape and reel

●Marking Diagram

Line-Up

Marking Name Package Order name

1Q011 SOP-J7S BM1Q011FJ-E2

LOT No.

1PIN MARK

1Q011

Part Number Marking

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Physical Dimension, Tape and Reel Information

Package Name SOP-J7S

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TSZ22111・15・001

●Revision History

Date Revision Changes

21.Jun.2016 001 New Release

Notice-PGA-E Rev.003

Notice

Precaution on using ROHM Products

1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,

OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you

intend to use our Products in devices requiring extremely high reliability (such as medical equipment (Note 1), transport

equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car

accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or

serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.

Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any

damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific

Applications.

(Note1) Medical Equipment Classification of the Specific Applications

JAPAN

USA

CHINA

CLASSⅢ

CLASSⅡb

CLASSⅢ

CLASSⅣ

CLASSⅢ

2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor

products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate

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a failure or malfunction of our Products may cause. The following are examples of safety measures:

[a] Installation of protection circuits or other protective devices to improve system safety

[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure

3. Our Products are designed and manufactured for use under standard conditions and not under any special or

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product performance, reliability, etc, prior to use, must be necessary:

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H2S, NH3, SO2, and NO2

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[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of

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[h] Use of the Products in places subject to dew condensation

4. The Products are not subject to radiation-proof design.

5. Please verify and confirm characteristics of the final or mounted products in using the Products.

6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,

confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power

exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect

product performance and reliability.

7. De-rate Power Dissipation depending on ambient temperature. When used in sealed area, confirm that it is the use in

the range that does not exceed the maximum junction temperature.

8. Confirm that operation temperature is within the specified range described in the product specification.

9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in

this document.

Precaution for Mounting / Circuit board design

1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product

performance and reliability.

2. In principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must

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please consult with the ROHM representative in advance.

For details, please refer to ROHM Mounting specification

Notice-PGA-E Rev.003

Precautions Regarding Application Examples and External Circuits

1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the

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2. You agree that application notes, reference designs, and associated data and information contained in this document

are presented only as guidance for Products use. Therefore, in case you use such information, you are solely

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incurred by you or third parties arising from the use of such information.

Precaution for Electrostatic

This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper

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isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).

Precaution for Storage / Transportation

1. Product performance and soldered connections may deteriorate if the Products are stored in the places where:

[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2

[b] the temperature or humidity exceeds those recommended by ROHM

[c] the Products are exposed to direct sunshine or condensation

[d] the Products are exposed to high Electrostatic

2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period

may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is

exceeding the recommended storage time period.

3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads

may occur due to excessive stress applied when dropping of a carton.

4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of

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A two-dimensional barcode printed on ROHM Products label is for ROHM’s internal use only.

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When disposing Products please dispose them properly using an authorized industry waste company.

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Other Precaution

1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.

2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written

consent of ROHM.

3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the

Products or this document for any military purposes, including but not limited to, the development of mass-destruction

weapons.

4. The proper names of companies or products described in this document are trademarks or registered trademarks of

ROHM, its affiliated companies or third parties.

DatasheetDatasheet

Notice – WE Rev.001

General Precaution

1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.

ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny

ROHM’s Products against warning, caution or note contained in this document.

2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior

notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s

representative.

3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all

information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or

liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or

concerning such information.

Datasheet

Part Number bm1q011fj

Package SOP-J7S

Unit Quantity 2500

Minimum Package Quantity 2500

Packing Type Taping

Constitution Materials List inquiry

RoHS Yes

bm1q011fj - Web Page

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