Simple Ballast Controller
Description
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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 : 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
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 S Q R Q Vcc
1.
6 µ A
10 µ A
Vz
2.
9V
CT 2
5V
Ict
Irt
7
OUT1
5.
2V
6.
25Ict
R Q 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
©2004 Fairchild Semiconductor Corporation
FAN7544
Pin Assignments
RPH 1 CT 2 RT 3 CPH 4 Y W W
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 Resis...
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