FSDM311L - Fairchild - Datasheet.Directory

July 2006

FSDM311 Rev. 1.1.0 • 7/14/06

FSDM311 Green Mode Fairchild Power Switch (FPS™)

FSDM311

Green Mode Fairchild Power Switch (FPS™)

Features

 Internal Avalanche Rugged SenseFET

 Precision Fixed Operating Frequency (67KHz)

 Advanced Burst-Mode Operation (power consumption

< 0.1W at 265VAC, no-load condition)

 Internal Start-up Circuit

 Pulse-by-Pulse Current Limit

 Over-Voltage Protection (OVP)

 Over-Load Protection (OLP)

 Internal Thermal Shutdown Function (TSD)

 Auto-Restart Mode

 Under-Voltage Lockout (UVLO) with Hysteresis

 Built-in Soft-Start

Applications

 Charger & Adapter for Mobile Phone, PDA & MP3

 Auxiliary Power for White Goods, PC, C-TV & Monitor

Related Application Notes

 AN-4137, AN-4141, AN-4147 (Flyback)

 AN-4134 (Forward)

 AN-4138 (Charger)

Description

The FSDM311, consisting of integrated Pulse-Width

Modulator (PWM) and SenseFET, is specifically

designed for high-performance, off-line Switch Mode

Power Supplies (SMPS) with minimal external

components. This device is an integrated high-voltage,

power-switching regulator which combines a VDMOS

SenseFET with a voltage mode PWM control block. The

integrated PWM controller features include: a fixed

oscillator, Under-Voltage Lockout (UVLO) protection,

Leading Edge Blanking (LEB), an optimized gate turn-

on/turn-off driver, Thermal Shutdown (TSD) protection,

and temperature-compensated, precision-current

sources for loop-compensation and fault-protection

circuitry. When compared to a discrete MOSFET and

controller or RCC switching converter solution, the

FSDM311 device reduces total component count and

design size and weight; while increasing efficiency,

productivity, and system reliability. This device provides

a basic platform that is well suited for the design of cost-

effective flyback converters.

Ordering Information

Product Number Package Marking Code BVDSS fOSC RDS (ON)

FSDM311 8DIP DM311 650V 67KHz

14Ω

FSDM311L 8LSOP DM311 650V 67KHz 14Ω

FPS™ is a trademark of Fairchild Semiconductor Corporation.

FSDM311 Rev. 1.1.0 • 7/14/06 2

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Typical Application & Output Power Table

Figure 1 Typical Flyback Application

OUTPUT POWER TABLE

Open Frame(1)

Product 230VAC±15%(2) 85~265VAC

FSDM311 13W 8W

FSDM311L 13W 8W

Notes:

1. Maximum practical continuous power in open-frame

design with sufficient drain pattern as a heat sink,

at 50°C ambient.

2. 230VAC or 100/115VAC with doubler.

Internal Block Diagram

Figure 2 Functional Block Diagram of FSDM311

FSDM311 Rev. 1.1.0 • 7/14/06 3

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Pin Assignments

Figure 3 Pin Configuration (Top View)

Pin Definitions

Pin Number Pin Name Pin Function Description

1 GND

Ground. SenseFET source terminal on primary side and internal control

ground.

2 VCC

Positive supply voltage input. Although connected to an auxiliary

transformer winding, current is supplied from pin 5 (Vstr) via an internal switch

during start-up (see Internal Block Diagram section). When VCC reaches the

UVLO upper threshold (9V), the internal start-up switch opens and device

power is supplied by the auxiliary transformer winding.

3 Vfb

Feedback. Inverting input to the PWM comparator with its normal input level

between 0.5V and 2.5V. It has a 0.4mA current source connected internally,

while a capacitor and opto-coupler are typically connected externally. A

feedback voltage of 4.5V triggers overload protection (OLP). There is a time

delay while charging the external capacitor Cfb from 3V to 4.5V using an

internal 5μA current source. This time delay prevents false triggering under

transient conditions, but allows the protection mechanism to operate under true

overload conditions.

4 NC

No Connection.

5 Vstr

Start-up. This pin connects directly to the rectified AC line voltage source. At

start-up, the internal switch supplies internal bias and charges an external

storage capacitor placed between the VCC pin and ground. Once the VCC

reaches 9V, the internal switch stops charging the capacitor.

6,7,8 Drain

SenseFET Drain. The drain pins are designed to connect directly to the

primary lead of the transformer and are capable of switching a maximum of

650V. Minimizing the length of the trace connecting these pins to the

transformer is recommended to decrease leakage inductance.

FSDM311 Rev. 1.1.0 • 7/14/06 4

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Absolute Maximum Ratings

The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The

device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables

are not guaranteed at the absolute maximum ratings.

TA=25°C, unless otherwise specified.

Symbol Parameter Value Unit

VDRAIN Drain Pin Voltage 650 V

VSTR Vstr Pin Voltage 650 V

VDG Drain-Gate Voltage 650 V

VGS Gate-Source Voltage ±20 V

IDM Drain Current Pulsed(3) 1.5 A

IDContinuous Drain Current (Tc=25°C) 0.5 A

IDContinuous Drain Current (Tc=100°C) 0.32 A

EAS Single Pulsed Avalanche Energy(4) 10 mJ

VCC Supply Voltage 20 V

VFB Feedback Voltage Range -0.3 to VSTOP V

PDTotal Power Dissipation 1.40 W

TJOperating Junction Temperature Internally limited °C

TAOperating Ambient Temperature -25 to +85 °C

TSTG Storage Temperature -55 to +150 °C

Notes:

3. Repetitive rating: Pulse width is limited by maximum junction temperature.

4. L = 24mH, starting TJ = 25°C.

Thermal Impedance

FSDM311 8DIP. TA=25°C, unless otherwise specified.

Symbol Parameter Value Unit

θJA Junction-to-Ambient Thermal Impedance(5) 88.84 °C/W

θJC Junction-to-Case Thermal Impedance(6) 13.94 °C/W

Notes:

5. Free standing with no heat sink, without copper clad. (Measurement Condition – Just before junction temperature

TJ enters into OTP.)

6. Measured on the DRAIN pin close to plastic interface.

All items are tested with the standards JESD 51-2 and 51-10 (DIP).

FSDM311 Rev. 1.1.0 • 7/14/06 5

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Electrical Characteristics

TA=25°C, unless otherwise specified.

Symbol Parameter Conditions Min. Typ. Max. Unit

SenseFET SECTION

VDS=650V, VGS=0V - - 25

IDSS Zero-Gate-Voltage Drain Current VDS=520V, VGS=0V,

TC=125°C - - 200 μA

RDS(ON) Drain-Source On-State Resistance(7) VGS=10V, ID=0.5A - 14 19 Ω

gfs Forward Trans-Conductance VDS=50V, ID=0.5A 1.0 1.3 - S

CISS Input Capacitance - 162 -

COSS Output Capacitance - 18 -

CRSS Reverse Transfer Capacitance

VGS=0V, VDS=25V,

f=1MHz - 3.8 -

td(on) Turn-On Delay Time - 9.5 -

trRise Time - 19 -

td(off) Turn-Off Delay Time - 33 -

tfFall Time

VDS=325V, ID=1.0A

- 42 -

QgTotal Gate Charge - 7.0 -

Qgs Gate-Source Charge - 3.1 -

Qgd Gate-Drain (Miller) Charge

VGS=10V, ID=1.0A,

VDS=325V - 0.4 -

CONTROL SECTION

fOSC Switching Frequency 61 67 73 KHz

ΔfOSC Switching Frequency Variation(8) -25°C ≤ TA ≤ 85°C - ±5 ±10 %

DMAX Maximum Duty Cycle 60 67 74 %

VSTART VFB=GND 8 9 10 V

VSTOP

UVLO Threshold Voltage VFB=GND 6 7 8 V

IFB Feedback Source Current 0V ≤ VFB ≤ 3V 0.35 0.40 0.45 mA

tS/S Internal Soft-Start Time 10 15 20 ms

VREF Reference Voltage(9) 4.2 4.5 4.8 V

ΔVREF/ΔT Reference Voltage Variation with

Temperature(8)(9) -25°C ≤ TA ≤ 85°C - 0.3 0.6 mV/°C

BURST-MODE SECTION

VBURH 0.6 0.7 0.8 V

VBURL

TJ=25°C 0.45 0.55 0.65 V

VBUR(HYS)

Burst-Mode Voltage

Hysteresis - 150 - mV

PROTECTION SECTION

ILIM Peak Current Limit 0.475 0.55 0.625 A

TSD Thermal Shutdown Temperature(9) 125 145 - °C

VSD Shutdown Feedback Voltage 4.0 4.5 5.0 V

VOVP Over-Voltage Protection 20 - - V

IDELAY Shutdown Delay Current 3V ≤ VFB ≤ VSD 4 5 6 μA

TOTAL DEVICE SECTION

IOP Operating Supply Current (control part only) VCC ≤ 16V - 1.5 3.0 mA

ICH Start-Up Charging Current VCC=0V , VSTR=50V 450 550 650 μA

Notes:

7. Pulse test: Pulse width ≤ 300μs, duty ≤ 2%.

8. These parameters, although guaranteed, are tested in EDS (wafer test) process.

9. These parameters, although guaranteed, are not 100% tested in production.

FSDM311 Rev. 1.1.0 • 7/14/06 6

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Temperature Characteristics

These characteristic graphs are normalized at TA = 25°C.

-50 0 50 100 150

0.85

0.90

0.95

1.00

1.05

1.10

1.15

Temperature [°C]

Vref

-50 0 50 100 150

0.85

0.90

0.95

1.00

1.05

1.10

1.15

Temperature [°C]

IOP

Figure 4 Reference Voltage (VREF) vs. TAFigure 5. Operating Supply Current (IOP) vs. TA

-50 0 50 100 150

0.85

0.90

0.95

1.00

1.05

1.10

1.15

Temperature [°C]

VSTAART

-50 0 50 100 150

0.85

0.90

0.95

1.00

1.05

1.10

1.15

Temperature [°C]

VSTOP

Figure 6. Start Threshold Voltage (VSTART) vs. TAFigure 7. Stop Threshold Voltage (VSTOP) vs. TA

-50 0 50 100 150

0.85

0.90

0.95

1.00

1.05

1.10

1.15

Temperature [°C]

fOSC

-50 0 50 100 150

0.85

0.90

0.95

1.00

1.05

1.10

1.15

Temperature [°C]

DMAX

Figure 8. Operating Frequency (fOSC) vs. TAFigure 9. Maximum Duty Cycle (DMAX) vs. TA

FSDM311 Rev. 1.1.0 • 7/14/06 7

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Temperature Characteristics (continued)

-50 0 50 100 150

0.85

0.90

0.95

1.00

1.05

1.10

1.15

Temperature [°C]

ILIM

-50 0 50 100 150

0.85

0.90

0.95

1.00

1.05

1.10

1.15

Temperature [°C]

IFB

Figure 10. Peak Current Limit (ILIM) vs. TAFigure 11. Feedback Source Current (IFB) vs. TA

-50 0 50 100 150

0.85

0.90

0.95

1.00

1.05

1.10

1.15

Temperature [°C]

IDELAY

-50 0 50 100 150

0.85

0.90

0.95

1.00

1.05

1.10

1.15

Temperature [°C]

VSD

Figure 12. Shutdown Delay Current (IDELAY) vs. TAFigure 13. Shutdown Feedback Voltage (VSD) vs. TA

-50 0 50 100 150

0.85

0.90

0.95

1.00

1.05

1.10

1.15

Temperature [°C]

VOVP

Figure 14. Over-Voltage Protection (VOVP) vs. TA

FSDM311 Rev. 1.1.0 • 7/14/06 8

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Functional Description

1. Start-up: At start-up, the internal high-voltage current

source supplies the internal bias and charges the

external Vcc capacitor, as shown in Figure 15. In the

case of the FSDM311, when Vcc reaches 9V, the device

starts switching and the internal high-voltage current

source stops charging the capacitor. The device is in

normal operation provided that Vcc does not drop below

7V. After start-up, the bias is supplied from the auxiliary

transformer winding.

Figure 15. Internal Startup Circuit

Calculating the Vcc capacitor is an important step in

design with the FSDM311. At initial start-up in the

FSDM311, the maximum value of start operating current

ISTART is about 100μA, which supplies current to UVLO

and Vref Blocks. The charging current IVcc of the Vcc

capacitor is equal to ISTR - ISTART. After VCC reaches the

UVLO start voltage, only the bias winding supplies Vcc

current to the device. When the bias winding voltage is

not sufficient, the Vcc level decreases to the UVLO stop

voltage and the internal current source is activated

again to charge the Vcc capacitor. To prevent this Vcc

fluctuation (charging/discharging), a Vcc with a value

between 10uF and 47μF should be chosen.

Figure 16. Charging Vcc Capacitor Through Vstr

2. Feedback Control: The FSDM311 is a voltage-mode

controlled device, as shown in Figure 17. Usually, an

opto-coupler with shunt regulator, like KA431, is used to

implement the feedback network. The feedback voltage

is compared with an internally generated sawtooth

waveform, which directly controls the duty cycle. When

the KA431 reference pin voltage exceeds the internal

reference voltage of 2.5V, the opto-coupler LED current

increases, the feedback voltage Vfb is pulled down, and

it reduces the duty cycle. This happens when the input

voltage increases or the output load decreases.

Figure 17. PWM and Feedback Circuit

FSDM311 Rev. 1.1.0 • 7/14/06 9

FSDM311 Green Mode Fairchild Power Switch (FPS™)

3. Leading Edge Blanking (LEB): At the instant the

internal SenseFET is turned on, the primary-side

capacitance and secondary-side rectifier diode reverse

recovery typically cause a high current spike through the

SenseFET. Excessive voltage across the Rsense resistor

leads to incorrect pulse-by-pulse current limit protection.

To avoid this, a leading edge blanking (LEB) circuit

disables pulse-by-pulse current limit protection block for

a fixed time (tLEB) after the SenseFET turns on.

4. Protection Circuit: The FSDM311 has several

protective functions, such as overload protection (OLP),

over-voltage protection (OVP), under-voltage lockout

(UVLO), and thermal shutdown (TSD). Because these

protection circuits are fully integrated in the IC without

external components, the reliability is improved without

increasing cost. Once a fault condition occurs, switching

is terminated and the SenseFET remains off. This

causes Vcc to fall. When Vcc reaches the UVLO stop

voltage VSTOP (7V), the protection is reset and the

internal high-voltage current source charges the Vcc

capacitor via the Vstr pin. When Vcc reaches the UVLO

start voltage VSTART (9V), the device resumes normal

operation. In this manner, the auto-restart can

alternately enable and disable the switching of the

power SenseFET until the fault condition is eliminated.

Figure 18. Protection Block

4.1 Overload Protection (OLP): Overload is defined as

the load current exceeding a pre-set level due to an

unexpected event. In this situation, the protection circuit

should be activated to protect the SMPS. However,

even when the SMPS is operating normally, the

overload protection (OLP) circuit can be activated during

the load transition. To avoid this undesired operation,

the OLP circuit is designed to be activated after a

specified time to determine whether it is a transient

situation or true overload situation. If the output

consumes more than the maximum power determined

by ILIM, the output voltage (Vo) decreases below its rating

voltage. This reduces the current through the opto-

coupler LED, which also reduces the opto-coupler

transistor current, thus increasing the feedback voltage

(VFB). If VFB exceeds 3V, the feedback input diode is

blocked and the 5μA current source (IDELAY) starts to

charge Cfb slowly up to Vcc. In this condition, VFB

increases until it reaches 4.5V, when the switching

operation is terminated, as shown in Figure 19. The

shutdown delay time is the time required to charge Cfb

from 3V to 4.5V with a 5μA current source.

FB DELAY

DELAY

Vt Vt

tC I AVt VVt V

12 1 2

()-()

; 5 ,() 3,() 4.5

====

Figure 19. Overload Protection (OLP)

4.2 Thermal Shutdown (TSD): The SenseFET and the

control IC are integrated, making it easier for the control

IC to detect the temperature of the SenseFET. When

the temperature exceeds approximately 145°C, thermal

shutdown is activated.

5. Soft-Start: The FPS has an internal soft-start circuit

that slowly increases the feedback voltage, together with

the SenseFET current, right after it starts up. The typical

soft-start time is 15ms, as shown in Figure 20, where

progressive increment of the SenseFET current is

allowed during the start-up phase. The soft-start circuit

progressively increases current limits to establish proper

working conditions for transformers, inductors,

capacitors, and switching devices. It also helps to

prevent transformer saturation and reduces the stress

on the secondary diode.

Figure 20. Internal Soft-Start

FSDM311 Rev. 1.1.0 • 7/14/06 10

FSDM311 Green Mode Fairchild Power Switch (FPS™)

6. Burst Operation: To minimize the power dissipation

in standby mode, the FSDM311 enters burst--mode

operation. As the load decreases, the feedback voltage

decreases. The device automatically enters burst mode

when the feedback voltage drops below VBURL(0.55V). At

this point, switching stops and the output voltages start

to drop. This causes the feedback voltage to rise. Once

it passes VBURH (0.70V), switching starts again. The

feedback voltage falls and the process repeats. Burst-

mode operation alternately enables and disables

switching of the power MOSFET to reduce the switching

loss in the standby mode.

Figure 21. Burst Operation Block

Figure 22. Burst Operation Function

FSDM311 Rev. 1.1.0 • 7/14/06 11

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Application Tips

Methods of Reducing Audible Noise

Switching mode power converters have electronic and

magnetic components, which generate audible noises

when the operating frequency is in the range of

20~20,000Hz. Even though they operate above 20KHz,

they can make noise in some load conditions. Designers

can employ several methods to reduce noise, including:

Glue or Varnish

The most common method involves using glue or

varnish to tighten magnetic components. The motion of

core, bobbin, and coil; and the chattering or

magnetostriction of core, can cause the transformer to

produce audible noise. The use of rigid glue and varnish

helps reduce the transformer noise, but can crack the

core because sudden changes in the ambient

temperature cause the core and the glue to expand or

shrink at different rates.

Figure 23. Equal Loudness Curves

Ceramic Capacitor

Using a film capacitor instead of a ceramic capacitor as

a snubber is another noise reduction solution. Some

dielectric materials show a piezoelectric effect,

depending on the electric field intensity. Hence, a

snubber capacitor becomes one of the most significant

sources of audible noise. It is possible to use a Zener

clamp circuit instead of an RCD snubber for higher

efficiency as well as lower audible noise.

Figure24. Typical Feedback Network of FPS

Other Reference Materials

AN-4134: Design Guidelines for Off-line Forward

Converters Using Fairchild Power Switch (FPS™)

Adjusting Sound Frequency AN-4137: Design Guidelines for Off-line Flyback

Converters Using Fairchild Power Switch (FPS™)

Moving the fundamental frequency of noise out of the

2~4KHz range is the third method. Generally, humans

are more sensitive to noise in the range of 2~4KHz.

When the fundamental frequency of noise is located in

this range, the noise is perceived as louder, although

the noise intensity level is identical. Refer to Figure 23

for equal loudness curves.

AN-4138: Design Considerations for Battery Charger

Using Green Mode Fairchild Power Switch (FPS™)

AN-4140: Transformer Design Consideration for Off-line

Flyback Converters Using Fairchild Power Switch

(FPS™)

When FPS acts in burst mode and the burst operation is

suspected to be a source of noise, this method may be

helpful. If the frequency of burst mode operation lies in

the range of 2~4KHz, adjusting the feedback loop can

shift the burst operation frequency. To reduce the burst

operation frequency, increase a feedback gain capacitor

(CF), opto-coupler supply resistor (RD), and feedback

capacitor (CB); and decrease a feedback gain resistor

(RF), as shown in Figure 24.

AN-4141: Troubleshooting and Design Tips for Fairchild

Power Switch (FPS™) Flyback Applications

AN-4147: Design Guidelines for RCD Snubber of

Flyback

AN-4148: Audible Noise Reduction Techniques for

Fairchild Power Switch (FPS™) Applications

FSDM311 Rev. 1.1.0 • 7/14/06 12

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Typical Application Example

Application Output Power Input Voltage Output Voltage (Max. Current)

12.5W DC 275~375V

5.1V (2.5A, isolated)

15V (20mA, non-isolated)

PC Standby Power

(Demo board) 10W DC 120~375V

5.1V (2.0A, isolated)

15V (20mA, non-isolated)

Features

 Auxiliary Power for PC Power Supply with Passive PFC

DC Input Voltage 275V ~ 375V (Voltage Doubler) for 12.5W Output

DC Input Voltage 120V ~ 375V (Off-Line Universal Input) for 10W Output

 Isolated Secondary Output 5.1V / 2.5A (max), 3.5A (peak) @VIN=275~375VDC

Isolated Secondary Output 5.1V / 2.0A (max), 2.5A (peak) @VIN =120~375VDC

 Non-Isolated Aux-Output 15V(13~17V) / 10mA (up to 20mA)

 Regulation 5.1V ±2.5% - Accuracy depends on Reference (e.g. shunt regulator or precision resistors)

 Low No-Load Power Consumption:

< 100mW @ All Input Voltage

< 820mW @ All Input Voltage, 0.5W Output

 High Efficiency:

> 80% @ 375Vdc Input, 12.5W Output

> 79% @ 160Vdc Input, 10W Output

Schematic

Note: The selection of aux-winding diode D2 affects Aux-Output (Vcc) regulation. If another component should be used, its

validity must be verified experimentally.

Figure 25. Schematic of FSDM311 PC Standby Power

FSDM311 Rev. 1.1.0 • 7/14/06 13

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Transformer Construction

BOTTOM

(pin side)

TOP

Figure 26. Transformer Construction Diagram

Wire (W5v or Wcc)

Insulation Tape

Core

Return

Wire

3~4mm 3~4mm

Figure 27. Winding Direction for Each Winding (Left) and

Cross-Sectional View for W5v / Wcc Insulation Taping (Right)

Figure 28. Details on W5v / Wcc Insulation Taping

FSDM311 Rev. 1.1.0 • 7/14/06 14

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Winding Specification

All windings should be wound tightly and evenly across the bobbin.

Winding Pin(S → F) Wire (φ:mm) Turns Winding Method

Top Insulation: Polyester Tape t = 0.025mm, 2 Layers(10)

Wp4 f2 → 1 0.22φ ×1 53 Solenoid winding

Insulation: Polyester Tape t = 0.025mm, 1 Layers(10)

Wp3 2 → f20.22φ ×1 53 Solenoid winding

Insulation: Polyester Tape t = 0.025mm, 2 Layers(11)

W5v 7,8,9 → 11,12 0.55φ ×2 12 Bifilar Solenoid winding

Insulation: Polyester Tape t = 0.025mm, 2 Layers(11)

Wcc 5 → 6 0.35φ ×1 34 Solenoid winding

Insulation: Polyester Tape t = 0.025mm, 1 Layers(10)

Wp2 f1 → 2 0.22φ ×1 53 Solenoid winding

Insulation: Polyester Tape t = 0.025mm, 1 Layers(10)

Bottom Wp1 3 → f10.22φ ×1 53 Solenoid winding

Notes:

10. Overlapped section length between the start and the end of insulation tape is about 3mm – see Figure 29.

11. See Figure

27 (right) and Figure 28 for details.

Figure 29. Overlapped Section of Insulation Taping

Electrical Characteristics

Pin Specification Remark

Magnetizing Inductance (Lm) 1 – 3 2.3mH (typical)

(2.2mH < Lm ≤ 2.4mH)

67KHz, 1 V

All other pins open

Leakage Inductance 1 – 3 < 35μH 67KHz, 1V

All other pins shorted

First Resonant Frequency 1 – 3 > 630KHz All other pins open

Core & Bobbin

 Core: EE1927S (SAMWHA Electronics, PL7 / Ae = 23.4mm2)

 Bobbin: Vertical, 12 pins, 6 pins at each side, 20mm width (bobbin wall to wall)

FSDM311 Rev. 1.1.0 • 7/14/06 15

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Circuit Part List

Item Qty. Reference Value Description

1 1 CS1 1.5nF 50V MLCC X7R, ±10% Tolerance SMD 0805

2 1 CY1 1nF AC250V Y1 Safety Capacitor

3 1 C1 10nF 1KV Ceramic

4 1 C2 1nF 1KV Ceramic

5 2 C3, C4 1000µF 10V Low ESR (40mΩ) Electrolytic

(e.g. Samwha Electric WB series)

6 1 C5 470µF 10V

Low ESR (70mΩ) Electrolytic

(e.g. Samwha Electric WB series)

7 1 C6 47nF 50V Ceramic X7R, ±5% Tolerance

8 1 C7 150nF 50V Ceramic X7R, ±5% Tolerance

9 2 C8, C9 47μF 25V Electrolytic

10 2 D1, D2 1N4007 1A, 1000V Diode (Fairchild Semiconductor)

11 1 D3 SB540 5A, 40V Schottky Diode

12 1 D4 1N4148 200mA, 100V Fast Switching Diode (Fairchild Semiconductor)

13 1 J1 (Wire) Jumper (Test Point)

14 1 L1 1μH 3.5A Inductor

15 1 RS1 10Ω Resistor 1/4W SMD 1206

16 1 R1 10Ω Resistor 1/4W

17 1 R2 1Ω Resistor 1/4W

(R3) Option for V2 Voltage Clamping

18 1 R4 6.2kΩ 2% 2% Precision Resistor 1/4W

19 1 R5 6kΩ 2% 2% Precision Resistor 1/4W

20 1 R6 20kΩ Resistor 1/4W

21 1 R7 200Ω Resistor 1/4W

22 1 R8 680Ω Resistor 1/4W

23 1 T1 EE1927S Transformer (Core: EE1927S Samwha Electronics)

24 1 U1 FSDM311 Fairchild Power Switch (Fairchild Semiconductor FPS)

25 1 U2 H11A817B Opto-coupler (Fairchild Semiconductor)

26 1 U3 KA431A Shunt Regulator (Fairchild Semiconductor)

27 1 ZD1 P6KE180A 180V TVS

28 1 ZD2 1N4763A 91V 1W Zener Diode

(ZD3) Option for V2 Voltage Clamping

(ZD4) Option for Protecting VFB Pin

FSDM311 Rev. 1.1.0 • 7/14/06 16

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Layout Information

Single layer, size 59 x 40mm

Figure 30. PCB Layout – Top- Side Print (Top) and Bottom-Side Print (Bottom)

FSDM311 Rev. 1.1.0 • 7/14/06 17

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Physical Dimensions

8-DIP

Dimensions are in millimeters (inches) unless otherwise noted.

FSDM311 Rev. 1.1.0 • 7/14/06 18

FSDM311 Green Mode Fairchild Power Switch (FPS™)

Physical Dimensions (Continued)

8-LSOP

Dimensions are in millimeters (inches) unless otherwise noted.

FSDM311 Rev. 1.1.0 • 7/14/06 19

FSDM311 Green Mode Fairchild Power Switch (FPS™)

TRADEMARKS

The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an

exhaustive list of all such trademarks.

ACEx™ GlobalOptoisolator™ OCXPro™ μSerDes™ TinyBuck™

ActiveArray™ GTO™ OPTOLOGIC®SILENT SWITCHER®TinyLogic®

Bottomless™ HiSeC™ OPTOPLANAR™ SMART START™ TINYOPTO™

Build it Now™ I2C™ PACMAN™ SPM™ TinyPower™

CoolFET™ i-Lo™ POP™ Stealth™ TinyPWM™

CROSSVOLT™ ImpliedDisconnect™ Power247™ SuperFET™ TruTranslation™

DOME™ IntelliMAX™ PowerEdge™ SuperSOT™-3 UHC™

EcoSPARK™ ISOPLANAR™ PowerSaver™ SuperSOT™-6 UltraFET®

E2CMOS™ LittleFET™ PowerTrench®SuperSOT™-8 UniFET™

EnSigna™ MICROCOUPLER™ QFET®SyncFET™ VCX™

FACT™ MicroFET™ QS™ TCM™ Wire™

FACT Quiet Series™ MicroPak™ QT Optoelectronics™ TinyBoost™

FAST®MICROWIRE™ Quiet Series™

FASTr™ MSX™ RapidConfigure™ Across the board. Around the world.™

FPS™ MSXPro™ RapidConnect™ Programmable Active Droop™

FRFET™ OCX™ ScalarPump™ The Power Franchise®

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS

HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF

THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE

UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF

FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE

PRODUCTS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR

SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.

As used herein:

1. Life support devices or systems are devices or

systems which, (a) are intended for surgical implant

into the body or (b) support or sustain life, and (c)

whose failure to perform when properly used in

accordance with instructions for use provided in the

labeling, can be reasonably expected to result in a

significant injury of the user.

2. A critical component in any component of a life

support, device, or system whose failure to

perform can be reasonably expected to cause the

failure of the life support device or system, or to

affect its safety or effectiveness.

PRODUCT STATUS DEFINITIONS

Definition of Terms

Datasheet Identification Product Status Definition

Advance Information Formative or In Design This datasheet contains the design specifications for product development.

Specifications may change in any manner without notice.

Preliminary First Production This datasheet contains preliminary data; supplementary data will be

published at a later date. Fairchild Semiconductor reserves the right to make

changes at any time without notice to improve design.

No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor

reserves the right to make changes at any time without notice to improve

design.

Obsolete

Not In Production This datasheet contains specifications on a product that has been

discontinued by Fairchild Semiconductor. The datasheet is printed for

reference information only.

Rev. I20