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FAN7544
Features
* * * * * * *
Simple Ballast Controller
Descriptions
The FAN7544 provides simple and high performance electronic 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 frequency and programmable run frequency. The initial preheating 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. Low Start-up and Operating Current : 140A, 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
8-DIP
8-SOP
1 1
Internal Block Diagram
5V
9V Vsup Bias Current 1 2.1 Iph - Irt
UVLO 1.9V 8
CPH 4
Vcc
2.9V
11.6V SQ RQ Vcc
1.6A
10A
Vz
2.9V
CT 2
5V
Ict
Irt
7
OUT1
5.2V
6.25Ict
RQ Oscillator S Latch Irt=Vref/Rt 6 Frequency Divider Vcc
1.5V
RT
3
Current Source Current Source
OUT2
RPH 1
+
2V
Iph=Vref/Rph Shutdown signal 5
-
GND
VCPH 5V
-
+
TSD
Rev. 1.0.0
(c)2004 Fairchild Semiconductor Corporation
FAN7544
Pin Assignments
RPH 1 CT 2 RT 3 CPH 4 YWW
8
VCC OUT1 OUT2 GND
YWW : Work Week Code
FAN7544
7
6
5
Pin Definitions
Pin Number 1 2 3 4 5 6 7 8 Pin Name RPH CT RT CPH GND OUT2 OUT1 VCC Pin Function Description Preheat frequency set resistor Oscillator frequency set capacitor Oscillator frequency set resistor Preheat time set capacitor Ground Gate drive output 2 Gate drive output 1 Supply voltage
2
FAN7544
Absolute Maximum Ratings
Parameter Supply Voltage Peak Drive Output Current Output Drive Clamping Diode Current CPH, CT, RT, and RPH Pins Input Voltage Operating Temperature Range Storage Temperature Range Power Dissipation Thermal Resistance (Junction-to-Air) 8-DIP 8-SOP 8-DIP 8-SOP Symbol VCC IOH, IOL Iclamp VIN Topr Tstg Pd Rja Value 30 600 10 -0.3 to 6 -25 to 125 -65 to 150 0.8 0.5 100 165 Unit V mA mA V C C W C/W
Temperature Characteristics (-25C Ta 125C)
Parameter Temperature Stability for Operating Frequency (fos) Symbol fos(Typ) Value 3 Unit %
3
FAN7544
Electrical Characteristics
Unless otherwise specified, for typical values Vcc=15V, Ta=25C, For Min/Max values Ta is the operating ambient temperature range with -25C Ta 125C and 12.7V VCC 30V Parameter Start Threshold Voltage UVLO Hysteresis SUPPLY CURRENT SECTION Start Up Supply Current Operating Supply Current Dynamic Operating Supply Current OSCILLATOR SECTION CPH Pin Charging Current 1 CPH Pin Charging Current 2 CPH Pin Clamp Voltage Preheating Frequency Preheating Dead Time Operating Frequency Operating Dead Time CT Threshold Voltage(note1) CT Charging Current CT Discharging Current Temperature Stability (Note1) Voltage Stability OUTPUT SECTION Gate Driver Source Current(note1) Gate Driver Sink Current(note1) Rising Time (Note1) Falling Time
(Note1)
Symbol VTH(st) HY(st) IST ICC IDCC ICPHL ICPHH VCLAMP fPH tpd fOS tOD VCT ICHG IDIS f/T f/V
Conditions VCC Increasing VCC < VTH(st) Output not switching 50kHz, CL =1nF VCPH=2V VCPH=4V VCPH=0V, RPH=47k, CT=470pF VCPH=0V, RPH=47k, CT=470pF VCPH=Open, RT=80k, CT=470pF VCPH=Open, RT=80k, CT=470pF Ta=25C -25C Ta 125C, VCC = 25V 12.7V VCC 30V, Ta=25C
Min. 10.5 1.4 1.3 7 4.8 70 0.8 45.5 1.6 3.2 170 0.9 13 -
Typ. 11.6 1.9 0.14 6.5 8 1.6 10 5.6 81.5 1.3 50 2.0 3.7 220 1.15 1 500 500 130 50 15 0.6 0.36 150
Max. 12.7 2.4 0.2 10 12 1.9 13 6.4 93 1.8 54.5 2.4 4.2 270 1.4 3 3 170 100 17 1 0.57 -
Unit V V mA mA mA A A V kHz s kHz s V A mA % % mA mA ns ns V V mA mA C
UNDER VOLTAGE LOCK OUT SECTION
IOSOURCE VOUT=0V IOSINK tr tf Vomax Vomin ISD ILATCH TSD VOUT=14.6V CL=1nF, Vcc=15V, Ta=25C CL=1nF, Vcc=15V, Ta=25C VCC = 25V VCC = 5V, IO = 100A RPH=47k VCC = 15V -
Maximum Output Voltage Output Voltage With UVLO Activated PROTECTION SECTION Shutdown Sink Current(note1) Latch Mode Quiescent Current Thermal Shutdown Junction Temperature (Note1)
Note: 1. These parameters, although guaranteed, are not 100% tested in production.
4
FAN7544
Typical Characteristics
0.008 0.007 0.006 0.005
8 10
9
idcc @VCC=30V idcc @VCC=15V idcc @VCC=12.5V
Idcc[A]
0.004 0.003 0.002 0.001 0.000 -0.001 0 5 10 15 20 25 30
Current [mA]
7
6
5
4 -60 -40 -20 0 20 40 60 80 100 120 140
Vcc[V]
Temperature [C]
Figure 1. UVLO
14.0 13.5 13.0 12.5 12.0 11.0 10.5 10.0 9.5 9.0 8.5 8.0 7.5 7.0 -60 -40 -20 0 20 40 60 80 100 120 140
3 -60 -40 4 9
Figure 2. Dynamic Operating Current
UV+ UVicc @VCC=30V icc @VCC=15V iccl @VCC=12.5V
8
Current [mA]
Voltage [V]
11.5
7
6
5
-20
0
20
40
60
80
100
120
140
Temperature [C]
Temperature [C]
Figure 3. UVLO Hysteresis
53
Figure 4. Operating Current
Rt=80k, Ct=470p
52
51
fosc [kHz]
50
49
48
47 -60 -40 -20 0 20 40 60 80 100 120 140
Temperature [C]
Figure 5. Switching Frequency
5
FAN7544
Typical Characteristics(Con't)
120
110
CT=470pF Vcc=15V Ta=25C
Fosc [kHz]
80 75 70
CT=470pF Vcc=15V Ta=25C
Fosc[kHz]
100
65 60 55
90
80 50 70 30 35 40 45 50 55 45 50 60 70 80 90
Rph [k]
Rt [k]
Figure 6. Preheating Frequency, CT=470pF
100
Figure 7. Switching Frequency, CT=470pF
130 120 110
CT=1nF Vcc=15V Ta=25C
Fosc[kHz]
90 80 70 60 50 40
CT=1nF Vcc=15V Ta=25C
Fosc[kHz]
100 90 80 70 60 10 15 20 25 30
20
25
30
35
40
45
50
Rph [k]
Rt [k]
Figure 8. Preheating Frequency, CT=1nF
Figure 9. Switching Frequency, CT=1nF
6
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
Vin ( ac ) x 2 - Vth ( st ) ,max Rst < -------------------------------------------------------------------------Ist ,max 85 x 2 - 12.5 = ------------------------------------- = 539k -3 0.2 x 10
( Vin ( ac_max ) 2 - Vcc ) P RSt = ----------------------------------------------------------------------- 0.5W R St
2
R St 2 x ( Vin ( ac_max ) 2 - Vcc ) R St 260K
2
260K R St 539K
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.
DC 400V
Rectifier Output
M1
G1
Rst D2 Vcc CQ
Cs ZD1 D1 G2 M2
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 output drivers are activated.
Figure 10. Start-up Circuit
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 4xIrt(=Vref/RT). The discharging current is 5.25 times of the charging current (5.25x4xrt). The charging period of the timing capacitor is the on time of the MOSFET. During the discharging period, both of the MOSFETs are off.
Charging Period(TCH) ICH
Discharging Period(TDIS) IDIS=6.25*ICH
Vref
ICH
VCT
3.7V CT
IDIS
OUT1
OUT2
Dead Time
Figure 11. CT & Output Waveforms
7
FAN7544
Operating Mode
Vcc
Vth(st)
0V < VCPH < 2.9V iCT = I RT +
;Preheating Frequency
t VCPH
5V 2.9V ICPHL=1.6A ICPHH=10A
( 5V - 2.9V )
I PH - I RT
( 5V - 2.9V ) = I PH
2.9V VCPH < 5V iCT = I RT + VCPH 5V iCT = I RT
; Frequency Sweep I PH - I RT ( 5V - VCPH ) ( 5V - 2.9V ) ; Run Frequency
t f
fpre frun fpre fign frun
t
preheating tph ignition tsw run
Figure 12. Timing Diagram
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 1.6A current source until the VCPH reaches 2.9V. From 0V to 2.9V of the VCPH after the VCPH start to be charged, the switching frequency throughout the preheating mode is determined by CT and RPH and the preheating time is decided by the CPH and the 1.6A current source. (TPRE=CPHx2.9V/1.6A) 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 10A 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 10A current source(TIGN=CPHxVCPH2/ICPHH). In this mode, the switching frequency is determined by CT, RPH and RT because the ICT is decided by the following equation.
ICT = I RT +
I RPH - I RT ( 5V - VCPH ) 2.1
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.
8
FAN7544
Application Circuit
<32Wx2 Lamps Ballast>
D4
1 4
L1
5
DC_400V D1
D12
D13
C1 R1
1
3
R13 D10 NTC R12 CY1 CY2 C4 D2
1
D11
1
R4 R2 D3 R5 M1
R8
R9 R6 5
Idet
C3
8
Vcc
7
OUT
6
GND
C2 R11
CX2 LF1 C5 CX1 R3 TNR F1
1 1 2 2 1
FAN7527B
EA_OUT MULT
R7
CS
R10
1
INV
2 C6
3
4
1
VR1
1
1
R14
AC INPUT
DC_400V M50 C100//C101
1 5
C53
R53
L100 ZD51
6 8 3 2
R104, R105
R106
R54 C102 M51 C54 L200
1 5 2
R50
T1 R52
1
D101 R204, R205 R206
C52
R51
R55
2
R56 D50
2
D51
C200//C201 D201 DC_400V R200, R201 D200
R203
C58 R59 C56
ZD53
C202
8
Vcc
7
OUT1
6
OUT2
5
GND
2
2
R60 R202 R100, R101 R102 R103
2
Q51
2
FAN7544
RPH CPH CT RT
ZD50
Q50
R57
ZD52
C203
2
Ignition Fail Detection Circuit
C51
C50
2
1 RPH
2 CT
3 RT
4 CPH
D100 C57 R58 C103
C55
2
Open Lamp Detection Circuit
9
FAN7544
Components List (for Wide-Range 32Wx 2Lamps Application)
Part number INPUT PART
F1 CX1 CX2 CY1, CY2 TNR NTC D10, D11, D12, D13
Value
250V, 3A 47nF, 275Vac 150nF, 275Vac 2200pF, 3000V 470V 10 400V, 1A 910k 22k 25.5k 10 22k 0.47 100k 2.2k 220k 150k 4.7 0 10k 0.22F, 630V 47F, 450V 10F, 50V 105 102 105 0.9mH(80T:6T) 600V, 1A, Ultrafast Schottky Diode Small Signal Diode 500V, 5A, Power Mosfet 390k 39 0 47k 5.6 62k 51k 82k 820k 300k
Note
Fuse Box-Cap Box-Cap Y-Cap 471 10D09 1N4004 Ceriamic, 1206 Ceriamic, 1206 Ceriamic, 1206 Ceriamic, 1206 Ceriamic, 1206 1W Ceriamic, 1206 Ceriamic, 1206 1W 1W Ceriamic, 1206 Ceriamic, 1206 Variable Resistor Miller-Cap Electrolytic Electrolytic Ceramic, 0805 Ceramic, 0805 Ceramic, 0805 EI2820 UF4005 MBR0540 FDLL4148 FQP5N50C, FQPF5N50C 1W Ceriamic, 1206 Ceriamic, 1206 Ceriamic, 1206 1W Ceriamic, 0805 Ceriamic, 1206 Ceriamic, 1206 Ceriamic, 1206 Ceriamic, 1206
Manufacturer
Fairchild -
PFC PART
R1, R2, R8 R3 R4 R5 R6 R7 R9 R10 R11 R12 R13 R14 VR1 C1 C2 C3 C4 C5 C6 L1 D1, D4 D2 D3 M1
Fairchild Fairchild Fairchild Fairchild -
Ballast PART
R50 R51, R53 R52, R57, R60 R54, R55 R56 R58, R59 RPH RT R100, R104, R200, R204 R101, R105, R201, R205 10
FAN7544
Part number
R102, R202 R103, R203 R106, R206 C50 C51 C52, C53 C54 C55, C56, C57, C58 CT CPH C100, C101, C200, C201 C102, C202 L100, L200 T1 Q50 M50, M51 D50, D51, D100, D101, D200, D201 ZD50, ZD51 ZD52, ZD53
Value
5.1k 50k 30k 4.7F, 50V 105 104 1nF, 630V 104 471 474 6.8nF, 630V 4.7nF, 1000V 3.2mH(120T) 4mH(50T:50T) 4mH(50T:100T) NPN transistor 500V, 5A, Power Mosfet Small Signal Diode 15V, 1W Zener Diode 15V, Zener Diode
Note
Ceriamic, 1206 Ceriamic, 1206 Ceriamic, 1206 Electrolytic Ceriamic, 0805 Ceramic, 1206 Miller-Cap Ceramic, 0805 Ceramic, 0805 Ceramic, 0805 Miller-Cap Miller-Cap EE2820 EE1614 KST2222A FQP5N500C, FQPF5N50C FDLL4148 1N4744A MMSZ5245B
Manufacturer
C53: 0, ZD51 : Open Fairchild Fairchild Fairchild Fairchild Fairchild
11
FAN7544
Mechanical Dimensions
Package Dimensions in millimeters/inches
8-SOP-225
12
FAN7544
Mechanical Dimensions (Continued)
Package Dimensions in millimeters/inches
8-DIP-300
13
FAN7544
Ordering Information
Product Number FAN7544N FAN7544M FAN7544MX Package 8DIP 8SOP 8SOP -25C ~ +125C Operating Temperature Packing Tube Tape & Reel
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. 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.
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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.
9/21/04 0.0m 001 Stock#DSxxxxxxxx 2004 Fairchild Semiconductor Corporation

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