FA5604 Datasheet, PDF (4/31 Pages) Fuji Electric – FUJI Power Supply Control IC

FA5604/5605/5606
1. Description
The FA5604/05/06 is the PWM type switching power supply control IC that can directly drive power MOSFET. This IC
realizes the low power consumption with reducing the switching frequency at light load. This IC contains many functions
in a small 8-pin package. With this IC, a high-performance and compact power supply can be created because not many
external discrete components are needed.
2. Features
 Voltage mode control
 Systems organized by circuit methods
FA5604: Applied to forward power supplies (maximum duty cycle = 46%)
FA5605/FA5606: Applied to flyback power supplies (maximum duty cycle = 70%)
 Automatically reduces the switching frequency to suppress loss in stand-by mode
 The switching frequency can be set (RT pin)
 A drive circuit for connecting a power MOSFET directly
 Output peak current: +1.0A / -0.5A
 Overcurrent of primary side limiting function (IS pin negative voltage sense)
 Overload protection function (switching frequency control by VF pin)
 Overload protection function (CS pin)
 Built-in output overvoltage latch protection (stopping the latch by pulling up the CS terminal by external signals)
 Undervoltage lockout function (17.5V ON / 9.7V OFF)
 8-pin package (SOP-8)
3. Outline
SOP-8
0.18±0.08
8
5
1
4
4.9
+0.10
0.20 -0.05
0°～8°
1.27
0.4 ±0.1
4. Types of FA5604
type
FA5604N
FA5605N
FA5606N
Max. duty
cycle(typ)
46%
70%
Frequency reduction
mode at light-load
FB voltage:
1.8 V/1.95 V
FB voltage:
1.55 V/1.65 V
Hiccup operation at
overload
Operation period:
shutdown period = 1:7
Operation period:
shutdown period = 1:15
Operation period:
shutdown period = 1:7
Overcurrent
detection
– detection
Package
SOP-8
Fuji Electric Co., Ltd.
AN-033E Rev.1.2
April-2011
4
http://www.fujielectric.co.jp/products/semiconductor/