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| 型號(hào)： | AN4129 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Green Current Mode PWM Controller FAN7601 |
| 中文描述： | 綠色電流模式PWM控制器FAN7601 |
| 文件頁(yè)數(shù)： | 1/12頁(yè) |
| 文件大?。?/td> | 367K |
| 代理商： | AN4129 |
Application Note AN4129
Green Current Mode PWM Controller FAN7601
www.fairchildsemi.com
2003 Fairchild Semiconductor Corporation
1. Introduction
This application note describes the operation and features of
the FAN7601. This device is a BCDMOS programmable
frequency current mode PWM controller which is designed
for off-line adapter applications and auxiliary power
supplies. To reduce power loss at light and no load, the
FAN7601 operates in burst mode and it includes a start-up
switch to reduce the losses in the start-up circuit.
Because of the internal start-up switch and burst mode oper-
ation, it is possible to supply an output power of 0.5W with
under 1W input power when the input line voltage is 265V.
On no load condition, input power is under 0.3W.
The FAN7601 offers a latch protection pin for the protection
of the system e.g. over voltage protection and/or thermal
shutdown.
The internal over voltage protection function shuts down the
IC operation when the supply voltage reaches 19V.
In addition, a soft start function is provided, and the soft start
time can be varied. Figure 1 shows a block diagram for the
FAN7601.
It contains the following blocks.
Start-up circuit and reference
Oscillator
Soft start and latch
Current sense and feed back
Burst mode
Output drive
Rev. 1.0.1
Latch/SS
Delay Circuit
1V
Enable
+
GND
Start-up
Circuit
2.5V
1.5V
Start-up
Circuit
5V Ref
Vcc
Vref
8
Rt/Ct
Latch/SS
OUT
CS/FB
UVLO
12uA
Vref
7
19V
OVP
+
+
+
12V/8V
6
2
+
0.97V/0.9V
1
R
Q
S
OSC
4
3
+
OVP
R
Q
S
Reset
Circuit
+
5
Vstr
1V
Figure 1. Internal Block Diagram of the FAN7601
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