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FAN7544 Datasheet

  • FAN7544

  • Simple Ballast Controller

  • 14頁

  • FAIRCHILD

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www.fairchildsemi.com
FAN7544
Features
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Simple Ballast Controller
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.
Low Start-up and Operating Current : 140碌A(chǔ), 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
C
PH
4
Vcc
2.9V
11.6V
S Q
R Q
Vcc
1.6碌A(chǔ)
10碌A(chǔ)
Vz
2.9V
C
T
2
5V
Ict
Irt
7
OUT1
5.2V
6.25Ict
R Q
Oscillator
S
Latch
Irt=Vref/Rt
6
Frequency
Divider
Vcc
1.5V
R
T
3
Current
Source
Current
Source
OUT2
R
PH
1
+
2V
Iph=Vref/Rph
Shutdown signal
5
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GND
V
CPH
5V
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+
TSD
Rev. 1.0.0
漏2004 Fairchild Semiconductor Corporation

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