PQ1CZ1 데이터 시트보기 (PDF) - Sharp Electronics

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PQ1CZ1

Surface Mount Type Chopper Regulator

Sharp Electronics 

Chopper Regulators

PQ1CZ1

In the external area of the safety operation area shown by the derating curve, the overheat protection circuit may operate to

shut-down output. However, please avoid keeping such condition for a long time.

s ON/OFF Control Terminal

In the following circuit,when ON/OFF control terminal t becomes low by switching transistor Tr on, output voltage may

be turned OFF and the device becomes stand-by mode. Dissipation current at stand-by mode becomes Max.400µA.

<Soft start>

When capacitor Cs is attached, output pulse gradually expanded and output voltage will start softly.

<ON/OFF control with soft startup>

For ON/OFF control with capacitor CS, be careful not to destroy a transistor Tr by discharge current from CS, adding a

resistor restricting discharge current of CS.

4

1

2

L

IO

VO

5

R2

+

VIN

3

CS

CIN

D

+

Load

CO

R1

Tr

ON/OFF control signal

(V)

3.55

(VTHH)

2.25

(VTHL)

1.4

(VTHON)

0

Step Down Voltage Circuit

Duty

DMAX

Duty

0%

1 Stand-by mode

2 OFF-state

3 Soft start

1

2

3

time

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