H34063AP datasheet(3/6 Pages) HSMC

3 / 6 page

HI-SINCERITY

MICROELECTRONICS CORP.

Spec. No. : Preliminary Data

Issued Date : 1998.08.01

Revised Date : 1999.06.01

Page No. : 3/6

HSMC Product Specification

Block Diagram

Application Information

Design Formula Table

Calculation

Step-Down

Step-Up

Voltage-Inverting

ton / toff

Vout+VF /

Vin(min) -Vsat-VOut

Vout+VF-Vin(min) /

Vin(min)-Vsat

|Vout| + VF /

Vin-Vsat

(ton + toff) max

1/Fmin

4*10

-5ton

4*10

-5ton

4*10

-5ton

IC(switch)

2*Iout(max)

2*Iout(max)(ton+toff/toff)2*Iout(max)(ton+toff/toff)

0.3 / IC(switch)

L(min)

(Vin(min)-Vsat-Vout / IC(switch))

*ton(max)

(Vin(min)-Vsat / IC(switch))

*ton(max)

(Vin(min)-Vsat/ IC(switch))

*ton(max)

IC(switch)*(ton+toff) /

8VRipple(P-P)

Iout*ton / VRipple(P-P)

Vsat : Saturation voltage of the output switch.

VF : Forward voltage drop of the ringback rectifier.

The following power supply characteristics must be chosen :

Vin : Nominal input voltage.

Vout : Desired output voltage. |Vout|=1.25*(1+RB/RA)

Iout- Desired output current

Fmin : Minimum desired output switching frequency at the selected values for Vin and Iout.

VRipple(P-P) : Desired peak to peak output ripple voltage in practice, the calculated value will need to be increased

due to the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value

since it will directly effect the line and load regulation.

Pin1:1.6A Switch Collector

Pin3:Oscilletor Timing Capacitor

GND

Pin4:Power GND

DRI

Pin8:Driver Collector

IPK

Pin7:Highside Current Sense

Input, VCC-VIPK=300mV

VCC

Pin6:Power Supply Input

Pin5:Feedback Comparator

Inverting Input

Pin2:Darlington Switch Emitter

Ω

IPK

Oscillator

Comparator

1.25V

Reference Voltage

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