FAN7554 View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
Manufacturer
FAN7554 Datasheet PDF : 22 Pages
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FAN7554
Vo
Cs
Vref
3.5V
S/S
2
0.3V
FB
1
100uA
1.5V
1K Ω
Cfb
5uA
Vcc
Remote control
SR
Q
OFF PWR
5V
ON /
SAVE
Vref
VCC
7
UVLO
15V/9V
Good logic
Internal bias
FAN7554
Figure 19. ON/OFF Control Circuit
Vref
5V
VS/S
5V
1.5V
Slope (dv/dt) = 100uA / Cs
Slope (dv/dt) = 1kΩ * Cs
Slope (dv/dt) = (1mA +100uA) / Cs
Vfb
0.3~3V
0.3V
Normal State
Slope (dv/dt) = (1mA +5A) / Cfb
OFF Signal
Slope (dv/dt) = (5uA) / Cfb
ON Signal
OFF State
Figure 20. ON-OFF Control Circuit Waveforms
Icc
4.5mA
0.2mA
t
3V
t
Normal State
t
12
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