FAN7544MX_NL - Fairchild Semiconductor

www.fairchildsemi.com

Rev. 1.0.0

Features

• Low Start-up and Operating Current : 140µA, 6.5mA

• Under Voltage Lock Out With 1.9V of Hysteresis

• 600mA of Totem Pole Output with High State Clamp

• Trimmed 1.5% Internal Bandgap Reference

• Programmable Preheat Time & Frequency

• Programmable Run Frequency

• High Accuracy Oscillator

Descriptions

The FAN7544 provides simple and high performance elec-

tronic ballast control functions. The FAN7544 is optimized

for electronic ballast requiring a minimum board area, by

reducing component counts and lowering power dissipation.

The features include programmable preheating time and fre-

quency and programmable run frequency. The initial pre-

heating time and frequency can be adjusted according to the

types of lamps using the CPH, CT and RPH. Output gate

driver circuit clamps power MOSFET gate voltage to the

supply voltage.

Internal Block Diagram

FAN7544

Simple Ballast Controller

8-DIP 8-SOP

GND

Latch

1.9V

CPH Vcc

RPH

OUT1

UVLO

11.6V

Vcc

Frequency

Divider

5.2V

1.5V

Oscillator

6.25Ict

Ict

Irt=Vref/Rt

OUT2

Iph=Vref/Rph

Current

Source

Current

Source

2.9V

Irt

Iph - Irt

2.1

Shutdown signal

−

Bias

Current

9V Vsup

TSD

−

VCPH

10µA

1.6µA

FAN7544

Pin Assignments

Pin Definitions

Pin Number Pin Name Pin Function Description

1 RPH Preheat frequency set resistor

TOscillator frequency set capacitor

3 RT Oscillator frequency set resistor

4 CPH Preheat time set capacitor

5 GND Ground

6 OUT2 Gate drive output 2

7 OUT1 Gate drive output 1

CC Supply voltage

CPH

RPH VCC

OUT1

OUT2

GND

FAN7544

YWW

YWW : Work Week Code

FAN7544

Absolute Maximum Ratings

Temperature Characteristics (-25°C ≤ Ta ≤ 125°C)

Parameter Symbol Value Unit

Supply Voltage VCC 30 V

Peak Drive Output Current IOH, IOL ±600 mA

Output Drive Clamping Diode Current Iclamp ±10 mA

CPH, CT, RT, and RPH Pins Input Voltage VIN -0.3 to 6 V

Operating Temperature Range Topr -25 to 125 °C

Storage Temperature Range Tstg -65 to 150 °C

Power Dissipation 8-DIP Pd 0.8 W

8-SOP 0.5

Thermal Resistance (Junction-to-Air) 8-DIP Rθja 100 °C/W

8-SOP 165

Parameter Symbol Value Unit

Temperature Stability for Operating Frequency (fos) ∆fos(Typ) 3 %

FAN7544

Electrical Characteristics

Unless otherwise specified, for typical values Vcc=15V, Ta=25°C, For Min/Max values Ta is the operating ambient

temperature range with -25°C ≤ Ta ≤ 125°C and 12.7V ≤ VCC ≤ 30V

Note:

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

Parameter Symbol Conditions Min. Typ. Max. Unit

UNDER VOLTAGE LOCK OUT SECTION

Start Threshold Voltage VTH(st) VCC Increasing 10.5 11.6 12.7 V

UVLO Hysteresis HY(st) - 1.4 1.9 2.4 V

SUPPLY CURRENT SECTION

Start Up Supply Current IST VCC < VTH(st) - 0.14 0.2 mA

Operating Supply Current ICC Output not switching - 6.5 10 mA

Dynamic Operating Supply Current IDCC 50kHz, CL =1nF - 8 12 mA

OSCILLATOR SECTION

CPH Pin Charging Current 1 ICPHL VCPH=2V 1.3 1.6 1.9 µA

CPH Pin Charging Current 2 ICPHH VCPH=4V 7 10 13 µA

CPH Pin Clamp Voltage VCLAMP - 4.8 5.6 6.4 V

Preheating Frequency fPH VCPH=0V,

RPH=47kΩ, CT=470pF 70 81.5 93 kHz

Preheating Dead Time tpd VCPH=0V,

RPH=47kΩ, CT=470pF 0.8 1.3 1.8 µs

Operating Frequency fOS VCPH=Open,

RT=80kΩ, CT=470pF 45.5 50 54.5 kHz

Operating Dead Time tOD VCPH=Open,

RT=80kΩ, CT=470pF 1.6 2.0 2.4 µs

CT Threshold Voltage(note1) ∆VCT Ta=25°C 3.2 3.7 4.2 V

CT Charging Current ICHG - 170 220 270 µA

CT Discharging Current IDIS - 0.9 1.15 1.4 mA

Temperature Stability (Note1) ∆f/∆T-25°C ≤ Ta ≤ 125°C,

VCC = 25V -13%

Voltage Stability ∆f/∆V 12.7V ≤ VCC ≤ 30V, Ta=25°C - - 3 %

OUTPUT SECTION

Gate Driver Source Current(note1) IOSOURCE VOUT=0V - 500 - mA

Gate Driver Sink Current(note1) IOSINK VOUT=14.6V - 500 - mA

Rising Time (Note1) tr CL=1nF, Vcc=15V, Ta=25°C - 130 170 ns

Falling Time (Note1) tf CL=1nF, Vcc=15V, Ta=25°C - 50 100 ns

Maximum Output Voltage Vomax VCC = 25V 13 15 17 V

Output Voltage With UVLO Activated Vomin VCC = 5V, IO = 100µA--1V

PROTECTION SECTION

Shutdown Sink Current(note1) ISD RPH=47kΩ-0.6-mA

Latch Mode Quiescent Current ILATCH VCC = 15V - 0.36 0.57 mA

Thermal Shutdown Junction

Temperature (Note1) TSD -- 150 - °C

FAN7544

Typical Characteristics

Figure 1. UVLO

-60 -40 -20 0 20 40 60 80 100 120 140

Current [mA]

Temperature [°C]

idcc @VCC=30V

idcc @VCC=15V

idcc @VCC=12.5V

-60 -40 -20 0 20 40 60 80 100 120 140

Current [mA]

Temperature [°C]

idcc @VCC=30V

idcc @VCC=15V

idcc @VCC=12.5V

idcc @VCC=30V

idcc @VCC=15V

idcc @VCC=12.5V

0 5 10 15 20 25 30

-0.001

0.000

0.001

0.002

0.003

0.004

0.005

0.006

0.007

0.008

Idcc[A]

Vcc[V]

0 5 10 15 20 25 30

-0.001

0.000

0.001

0.002

0.003

0.004

0.005

0.006

0.007

0.008

Idcc[A]

Vcc[V]

-60 -40 -20 0 20 40 60 80 100 120 140

7.0

7.5

8.0

8.5

9.0

9.5

10.0

10.5

11.0

11.5

12.0

12.5

13.0

13.5

14.0

Voltage [V]

Temperature [°C]

UV+

UV-

-60 -40 -20 0 20 40 60 80 100 120 140

7.0

7.5

8.0

8.5

9.0

9.5

10.0

10.5

11.0

11.5

12.0

12.5

13.0

13.5

14.0

-60 -40 -20 0 20 40 60 80 100 120 140

7.0

7.5

8.0

8.5

9.0

9.5

10.0

10.5

11.0

11.5

12.0

12.5

13.0

13.5

14.0

Voltage [V]

Temperature [°C]

UV+

UV-

-60 -40 -20 0 20 40 60 80 100 120 140

Current [mA]

Temperature [°C]

icc @VCC=30V

icc @VCC=15V

iccl @VCC=12.5V

-60 -40 -20 0 20 40 60 80 100 120 140

Current [mA]

Temperature [°C]

icc @VCC=30V

icc @VCC=15V

iccl @VCC=12.5V

-60 -40 -20 0 20 40 60 80 100 120 140

53 Rt=80kΩ, Ct=470p

fosc [kHz]

Temperature [°C]

-60 -40 -20 0 20 40 60 80 100 120 140

53 Rt=80kΩ, Ct=470p

fosc [kHz]

Temperature [°C]

Figure 2. Dynamic Operating Current

Figure 4. Operating Current

Figure 3. UVLO Hysteresis

Figure 5. Switching Frequency

FAN7544

Typical Characteristics(Con’t)

30 35 40 45 50 55

100

110

120

Fosc[kHz]

Rph [kΩ]

CT=470pF

Vcc=15V

Ta=25°C

30 35 40 45 50 55

100

110

120

Fosc[kHz]

Rph [kΩ]

CT=470pF

Vcc=15V

Ta=25°C

50 60 70 80 90

80 CT=470pF

Vcc=15V

Ta=25°C

Fosc [kHz]

Rt [kΩ]

50 60 70 80 90

80 CT=470pF

Vcc=15V

Ta=25°C

Fosc [kHz]

Rt [kΩ]

Figure 6. Preheating Frequency, CT=470pF Figure 7. Switching Frequency, CT=470pF

Figure 8. Preheating Frequency, CT=1nF Figure 9. Switching Frequency, CT=1nF

10 15 20 25 30

100

110

120

130

Fosc[kHz]

Rph [kΩ]

CT=1nF

Vcc=15V

Ta=25°C

10 15 20 25 30

100

110

120

130

Fosc[kHz]

Rph [kΩ]

CT=1nF

Vcc=15V

Ta=25°C

20 25 30 35 40 45 50

100

Fosc[kHz]

Rt [kΩ]

CT=1nF

Vcc=15V

Ta=25°C

20 25 30 35 40 45 50

100

Fosc[kHz]

Rt [kΩ]

CT=1nF

Vcc=15V

Ta=25°C

FAN7544

Application Information

Start-up Circuit

The start-up current is supplied to the IC through the start up resistor (Rst). In order to reduce the power dissipation in Rst, the

Rst is connected to the full wave rectified output voltage.

The following equations can be used to calculate the size of Rst

The size of supply capacitor (Cs) is normally decided in

terms of the start up time and operating current built up

by auxiliary operating current source.

The turn off snubber capacitor (CQ) and two diodes

(D1, D2) constitute the auxiliary operating current

source for the IC. The charging current through the CQ

flows into the IC and also charges the supply capacitor.

If the size of CQ is increased, the VCC voltage on the

Cs is also increased.

Under Voltage Lock Out(UVLO)

UVLO mode of the FAN7544 is designed to maintain

an ultra low supply current of less than 140uA, and to

guarantee that the IC is fully functional before two out-

put drivers are activated.

Oscillator

The gate drive output frequency is as half as that of the triangular waveform on timing capacitor (CT) at pin #2. In normal

operating mode, the timing capacitor charging current is 4×Irt(=Vref/RT). The discharging current is 5.25 times of the charg-

ing current (5.25×4×Ιrt). The charging period of the timing capacitor is the on time of the MOSFET. During the discharging

period, both of the MOSFETs are off.

Rst Vin ac

() 2Vthst()max,–×

Ist max,

---------------------------------------------------------------------------

85 2 12.5–×

0.2 10 3–

--------------------------------------539kΩ==

PRSt

Vin ac_max()2Vcc–⋅()

RSt

------------------------------------------------------------------------ 0.5W≤=

RSt 2 Vin ac_max()2Vcc–⋅()

×≥

RSt 260K≥

260K RSt 539K≤≤∴

DC 400V

Rectifier

Output

Rst

Vcc

ZD1

Figure 10. Start-up Circuit

Figure 11. CT & Output Waveforms

VCT

OUT1

OUT2

Charging

Period(∆TCH)

Discharging

Period(∆TDIS)

ICH IDIS=6.25*ICH

3.7V

Vref

ICH

IDIS

Dead Time

FAN7544

Operating Mode

The FAN7544 has three operating mode as was shown in the figure 12.

1) Preheating Mode

The preheating mode is defined as the IC’s internal status is in when the lamp filaments are being heated to correct emission

temperature. This is necessary for maximizing lamp life and reducing the required ignition voltage. As soon as the Vcc

exceeds the UVLO high threshold , the preheating time set-up capacitor, CPH starts to be charged by the internal 1.6µA cur-

rent source until the VCPH reaches 2.9V. From 0V to 2.9V of the VCPH after the VCPH start to be charged, the switching fre-

quency throughout the preheating mode is determined by CT and RPH and the preheating time is decided by the CPH and the

1.6µA current source. (∆TPRE=CPH×2.9V/1.6µA)

2) Ignition mode

The ignition mode is defined as the IC’s internal status is in when a high voltage is established across the lamp necessary for

igniting the lamp. When the VCPH exceeds 2.9V, the FAN7544 enters the ignition mode, and moves to the run mode when the

VCPH exceeds 5V. In this period, the internal 10µA current source charges the external preheating timing capacitor(CPH) in

order to increase noise immunity with sharp slop of the VCPH. The ignition time is decided CPH and internal 10µA current

source(∆TIGN=CPH×∆VCPH2/ICPHH). In this mode, the switching frequency is determined by CT, RPH and RT because the

ICT is decided by the following equation.

3) Run Mode

After the lamp has successfully ignited, the FAN7544 enters run mode. The run mode is defined as the IC’s internal status is in

when the lamp is being driven with a normal power level after the lamp is discharged. The run mode switching frequency is

determined by the timing resistor RT and timing capacitor CT. As soon as the VCPH exceeds 5V, the protection masking mode

is disable and the IC can enter the protection mode.

Protection Mode

If the voltage at the RPH pin decreases below 2V during the run mode, the FAN7544 enters the protection mode and all gate

drive outputs(OUT1 & OUT2) are latched off in the low state and the VCPH is decreased to 0V. To exit the protection mode,

the Vcc must go down below the UVLO low threshold.

()

RPH RT

CT RT CPH

II VV

−

=+ −

()

02.9

52.9

2.9 5

52.9

;

CPH

PH RT

CT RT PH

CPH

PH RT

CT RT CPH

CPH

CT RT

VV V

iI V VI

;Preheating Fre

iI VV

Frequency Sw

VRun Frequen

enc

−

=+ − =

−

≤<

−

=+ −

−

≥

Figure 12. Timing Diagram

Vcc

fpre

frun

fign

preheating ignition run

Vth(st)

VCPH

2.9V

frun

fpre

tph tsw

ICPHL=1.6µAICPHH=10µA

FAN7544

Application Circuit

<32W×2 Lamps Ballast>

AC INPUT

5678

OUT

Vcc

GND

Idet

INV

EA_OUT

MULT

FAN7527B

1234

TNR

CX1

CY1 CY2

LF1

CX2

NTC

D10

D12

D11

D13

DC_400V

VR1

R11

ZD50

R12 D2

R10

OUT1CT

FAN7544

ZD51

R53

C52

CPH

R51

R50

C100//C101

D51 C200//C201

C102

5678

Vcc

OUT2

GND

CPH

12 4

C202

C54

M50

M51

R52

C50

RPH

L100

L200

DC_400V

D50

C51

C53

R54

R55 R56

Q50

R57

R58

R102

R100,

R101

R200,

R201

R202

R203

R103

C55

C203

C103

D200

D100

Open Lamp

Detection Circuit

T1 13

ZD53 R59

R104,

R105

R106

R204,

R205 R206

D101

D201

C56

Q51

R13

RPH

Ignition Fail

Detection Circuit

R14

ZD52

R60

C57

C58

FAN7544

Components List (for Wide-Range 32W× 2Lamps Application)

Part number Value Note Manufacturer

INPUT PART

F1 250V, 3A Fuse -

CX1 47nF, 275Vac Box-Cap -

CX2 150nF, 275Vac Box-Cap -

CY1, CY2 2200pF, 3000V Y-Cap -

TNR 470V 471 -

NTC 10Ω10D09 -

D10, D11, D12, D13 400V, 1A 1N4004 Fairchild

PFC PART

R1, R2, R8 910kΩCeriamic, 1206 -

R3 22kΩCeriamic, 1206 -

R4 25.5kΩCeriamic, 1206 -

R5 10ΩCeriamic, 1206 -

R6 22kΩCeriamic, 1206 -

R7 0.47Ω1W -

R9 100kΩCeriamic, 1206 -

R10 2.2kΩCeriamic, 1206 -

R11 220kΩ1W -

R12 150kΩ1W

R13 4.7ΩCeriamic, 1206

R14 0ΩCeriamic, 1206

VR1 10kΩVariable Resistor -

C1 0.22µF, 630V Miller-Cap -

C2 47µF, 450V Electrolytic -

C3 10µF, 50V Electrolytic -

C4 105 Ceramic, 0805 -

C5 102 Ceramic, 0805 -

C6 105 Ceramic, 0805 -

L1 0.9mH(80T:6T) EI2820

D1, D4 600V, 1A, Ultrafast UF4005 Fairchild

D2 Schottky Diode MBR0540 Fairchild

D3 Small Signal Diode FDLL4148 Fairchild

M1 500V, 5A, Power Mosfet FQP5N50C, FQPF5N50C Fairchild

Ballast PART

R50 390kΩ1W -

R51, R53 39ΩCeriamic, 1206 -

R52, R57, R60 0ΩCeriamic, 1206 -

R54, R55 47kΩCeriamic, 1206 -

R56 5.6Ω1W -

R58, R59 62kΩCeriamic, 0805 -

RPH 51kΩCeriamic, 1206

RT 82kΩCeriamic, 1206 -

R100, R104, R200, R204 820kΩCeriamic, 1206 -

R101, R105, R201, R205 300kΩCeriamic, 1206 -

FAN7544

Part number Value Note Manufacturer

R102, R202 5.1kΩCeriamic, 1206 -

R103, R203 50kΩCeriamic, 1206 -

R106, R206 30kΩCeriamic, 1206

C50 4.7µF, 50V Electrolytic -

C51 105 Ceriamic, 0805 -

C52, C53 104 Ceramic, 1206 -

C54 1nF, 630V Miller-Cap -

C55, C56, C57, C58 104 Ceramic, 0805 -

CT 471 Ceramic, 0805 -

CPH 474 Ceramic, 0805 -

C100, C101, C200, C201 6.8nF, 630V Miller-Cap -

C102, C202 4.7nF, 1000V Miller-Cap -

L100, L200 3.2mH(120T) EE2820 -

T1 4mH(50T:50T) EE1614 -

4mH(50T:100T) C53: 0Ω, ZD51 : Open

Q50 NPN transistor KST2222A Fairchild

M50, M51 500V, 5A, Power Mosfet FQP5N500C, FQPF5N50C Fairchild

D50, D51, D100, D101,

D200, D201 Small Signal Diode FDLL4148 Fairchild

ZD50, ZD51 15V, 1W Zener Diode 1N4744A Fairchild

ZD52, ZD53 15V, Zener Diode MMSZ5245B Fairchild

FAN7544

Mechanical Dimensions

Package

Dimensions in millimeters/inches

8-SOP-225

FAN7544

Mechanical Dimensions (Continued)

Package

Dimensions in millimeters/inches

8-DIP-300

FAN7544

9/21/04 0.0m 001

Stock#DSxxxxxxxx

 2004 Fairchild Semiconductor Corporation

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 THE PRESIDENT 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.

www.fairchildsemi.com

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.

Ordering Information

Product Number Package Operating Temperature Packing

FAN7544N 8DIP

-25°C ~ +125°CTube

FAN7544M 8SOP

FAN7544MX 8SOP Tape & Reel