FAN4800IN-G Просмотр технического описания (PDF) - Fairchild Semiconductor
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FAN4800IN-G Datasheet PDF : 20 Pages
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Block Diagram
16
VEAO
15 VFB
2.5V
0.3V
2 IAC
4 VRMS
3 ISENSE
RAMP1
7
GAIN
MODULATOR
1
IEAO
Low Power
Detector
3.5k
POWER FACTOR CORRECTOR
VCC
17.9V
VCC OVP
2.78V
TRI-FAULT
PFC OVP
0.5V
-1V
3.5k
PFC CMP
PFC ILIMIT
OSCILLATOR
13
VCC
7.5V
REFERENCE
VREF 14
SQ
R
SQ
R
PFC OUT
12
CLK
8 RAMP2
350
6 VDC
0.9V
VCC
20μA
5 SS
350
VREF
9 DC ILIMIT
PWM CMP
DUTY CYCLE
LIMIT
PWM DUTY
PFC
OUT
PWM
OUT
SS CMP
VFB
2.25V
VIN OK
1.0V
DC ILIMIT
PULSE WIDTH MODULATOR
QS
R
SQ
R
PWM OUT
11
VCC UVLO
GND
10
FAN4800 Rev.02
Figure 1. Internal Block Diagram
© 2005 Fairchild Semiconductor Corporation
FAN4800 Rev. 1.0.5
2
www.fairchildsemi.com
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