APW34063 データシートの表示（PDF） - Anpec Electronics

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APW34063

1.5A, DC/DC Switching Regulators

Anpec Electronics 

APW34063

Electrical Characteristics (Cont.)

Note :

2.Tlow=0°CV, Thigh=+70°C

3.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient

temperature as possible.

4.If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents (≤300mA) and high driver

currents (≥30mA), it may take up to 2.0µs for it to come out of saturation. This condition will shorten the off time at frequencies≥30kHz,

and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot

saturate. If a non-Darlington configuration is used, the following output drive condition is recommended :

Forced β of output switch : IC output

≥ 10

IC driver - 7.0mA*

* The 100Ω resistor in the emitter of the driver device requires about 7.0mA before the output switch conducts.

Typical Application Circuits

Step-Up Converter

170µ H

L

8

180

7

R SC

0.22

VIN

12V

6

100

5

SQ

R

Q2

Q1

100

IPK

CT

Oscillator

Comp.

1.25V

Reference

Regulator

1

2

IN5819

3

CT

1500pF

4

R2

47k

R1 2.2k

Copyright © ANPEC Electronics Corp.

Rev. A.3 - May., 2005

VOUT

28V/175mA

330

CO

1.0µ H

VOUT

100

optional

Filter

4

www.anpec.com.tw

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