FA5546 Datasheet, PDF (4/27 Pages) Fuji Electric – Switching Power Supply Control IC

FA5546/47
1. Overview
FA5546/47 is a current mode type switching power supply control IC possible to drive a power MOSFET directly.
Despite of a small package with 8 pins, it has a lot of functions and it is best suited for power saving at the light load and
decreasing external parts. Moreover it enables to realize a reduced space and a high cost-performance power supply.
2. Features
・Excellent Power Saving by lowering the oscillation frequency depending on the load at light load.
・Low power consumption by a built-in 500V high voltage startup circuit.
・Current Minus detection. Power Saving of the revision of the input voltage of OLP.
・Overload protection function with a few number of external components. Auto Recovery type or Timer Latch type.
・Two-stages Over Load Protection suitable for Motor Driving.
・Brown-In/Out Function without additional external components.
・VCC Over Voltage Protection function(OVP) (Vcc=26V).
・VCC Under-Voltage Lock-Out function (UVLO). (Vcc=18V/9.8V)
・Minimum ON width is replaced and restrains transient leaping up of the drain voltage of the MOSFET.
・Latch pin for an external signal: Over Temperature Protection, Over Voltage Protection etc.
・External MOSFET driving suitable for Power Supply up to 200W: -1.0A(sink),/+0.5A(source)
・Soft Start function.
Function list (2 Stage OLP type)
Part
Switching
Number frequency
FA5546
60kHz
FA5547
60kHz
OLP Type
Auto Recovery
Latch
OLP Delay time
200ms
200ms
OLP restart time
1400ms
-
IS pin VthIS(Voltage for
current detection)
-0.95V
-0.95V
3. Outline drawing
8
5
DIP-8
SOP-8
1
4
9.4
2.54
0.5±0.1
2.54×3=7.62
0.25 ±0.1
7.6
15°
～
0°
Fuji Electric Co., Ltd.
AN-027E Rev.0.4
April -2011
4
http://www.fujielectric.co.jp/products/semiconductor/