PQ1PF1 データシートの表示（PDF） - Sharp Electronics

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PQ1PF1

Primary Regulator for Switching Power Supply (50W Class)

Sharp Electronics 

Primary Regulators

PQ1PF1

While AC input voltage is OFF, output of IC is shut down and it takes some time to restart. This is because electric potential

of IC input terminal (Vcc) is more than operation stopping voltageVCC (OFF) 9.3V Typ., and IC keeps operating.(Refer to

Fig.12)

In this case, connect the starting resistor before smoothing so that Vcc soon drops to 0V. As a result, output will not be shut

down while AC input voltage is OFF. (Refer to Fig.11)

Fig. 12 Timing Chart at OFF-state of AC Input Voltage (Connecting Starting Resistor after Rectification)

VIN AC

VOUT

VCC

9.3V

Output shut-down state

Impossible to restart

IC operates.

possible to restart

AC OFF

t

2 Patterning to Printed Circuit Board

Patterning to a printed circuit board may cause a noise and a malfuntion. Especially for dotted line portion Fig.13, reduce the

roop area and make the pattern thick and short because high frequency current flows in that portion.

The capacitor C12 which should be connected to CA teminal must be connected as close as possible to IC, and auxitiary

winding GND must be directly connected to IC GND (do not connect by way of control system GND).

Fig. 13 Patterning to PCB

T1

D5

VIN

VOUT

+

+

C6

C16

GND

(FG)

GND IC VDS

CA FB

C12

VCC

D6

PC1

+

C10

Control system GND

Auxiliary winding GND

GND

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