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FAN7556 Datasheet

  • FAN7556

  • Voltage Mode PWM Controller

  • 10頁

  • FAIRCHILD

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www.fairchildsemi.com
FAN7556
Features
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Voltage Mode PWM Controller
Description
The FAN7556 is a fixed frequency voltage mode PWM
controller. It is specially designed for off-line and DC-DC
converter applications with minimal external components.
These integrated circuits feature a trimmed oscillator for
precise duty cycle control, a temperature compensated
reference, an on/off control, a high gain error amplifier, a
current sensing comparator, and a high current totem-pole
output. The FAN7556 has various protection functions such
as an over load protection (OLP), an over current
protection(OCP), and an over voltage protection(OVP). The
FAN7556 is available in the 8DIP package as well as the
8SOP package.
8-DIP
Voltage Mode Control
Pulse by Pulse Current Limiting
Low External Components
Under Voltage Lockout ( UVLO): 9V/15V
Stand-by Current: Typ. 100uA
Power Saving Mode Current: Typ. 200uA
Operating Current: Typ. 7mA
Soft Start
On/off Control
Over Load Protection (OLP)
Over Current Protection (OCP)
Over Voltage Protection (OVP)
Wide Operating Frequency Range (20kHz ~ 500kHz)
Auto-Restart Function
Applications
鈥?Off-Line & DC-DC Converter
1
8-SOP
1
Internal Block Diagram
CT
Vcc
6
+
34V
+
+
_
+
_
_
_
_
15/9V
CLK
OSC
14V
PWM
OVP
+
+
_
_
1k
0.3V
+
1.5V
1mA
3k
Vref
Vcc
5uA
OLP
COM-out
OVP-out
UVLO-out
+
S
R
Q
_
6V
+
+
_
_
S
Q
R
off
PWR
/
SAVE
Vref
7
4
COM
LA
1
2V
Vref
3.5V
100uA
S/S
8
2.7V
Q
R
S
漏2002 Fairchild Semiconductor Corporation
_
_
_
FB
2
+
+
_
_
_
+
UVLO
on
5
OUT
OCP
3
0.25V
IS
4
GND
Rev. 1.0.1

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