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FAN7544N Datasheet(PDF) 1 Page - Fairchild Semiconductor

Part # FAN7544N
Description  Simple Ballast Controller
Download  14 Pages
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN7544N Datasheet(HTML) 1 Page - Fairchild Semiconductor

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©2004 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0
Features
• Low Start-up and Operating Current : 140
µA, 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
1
1
GND
Latch
1.9V
CPH
Vcc
RPH
RT
OUT1
UVLO
11.6V
1
3
6
4
7
Vcc
Vcc
Frequency
Divider
Q
2
5.2V
1.5V
Oscillator
6.25Ict
Ict
Irt=Vref/Rt
CT
OUT2
Iph=Vref/Rph
Current
Source
Current
Source
2.9V
2.9V
Irt
5V
Iph - Irt
1
2.1
5V
2V
Shutdown signal
+
Bias
Current
9V Vsup
TSD
+
VCPH
5V
8
Vz
5
R
Q
S
Q
R
S


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