AN-087E Rev.1.0

April-2011

22

FA5526/5527/5528/5536/5537/5538

Fuji Electric Co., Ltd.

http://www.fujielectric.co.jp/products/semiconductor/

(13) Output circuit

The output circuit consists of push-pull configuration, capable of directly driving a MOSFET. The maximum peak

currents at the OUT pin are 0.25A for source current and 0.5A for sink current.

If the IC stops operation when the under-voltage lockout circuit operates or in the latch mode, OUT pin voltage is

forced to be low to shut down the MOSFET.

(14) Timing chart

Oscillator (OSC)

Trigger (T) Output

Blanking

CLR Signal

Blanking

Output signal

(set pulse)

FB pin

Voltage

IS pin

Voltage

IS comp. output

(reset pulse)

FF

“Q” output

OSC

Q output

OUT pin

Output voltage

Blanking Time

Fig.18

Timing chart at steady operation