MC34067 datasheet(1/16 Pages) ONSEMI

Part #	MC34067

Description	HIGH PERFORMANCE ZERO VOLTAGE SWITCH RESONANT MODE CONTROLLERS

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Manufacturer	ONSEMI [ON Semiconductor]

Direct Link	http://www.onsemi.com

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MC34067

MC33067

HIGH PERFORMANCE

ZERO VOLTAGE SWITCH

RESONANT MODE

CONTROLLERS

PIN CONNECTIONS

Order this document by MC34067/D

P SUFFIX

PLASTIC PACKAGE

CASE 648

DW SUFFIX

PLASTIC PACKAGE

CASE 751G

(SO–16L)

16

1

(Top View)

Vref

Osc Charge

Osc RC

Osc Control Current

Gnd

Error Amp Out

Inverting Input

Noninverting Input

One–Shot RC

VCC

Drive Output B

CSoft–Start

Enable/UVLO

Adjust

Drive Output A

Power Gnd

Fault Input

Device

Operating

Temperature Range

Package

TA = 0 to + 70°C

TA = – 40° to + 85°C

ORDERING INFORMATION

MC34067DW

SO–16L

MC34067P

Plastic DIP

MC33067DW

SO–16L

MC33067P

Plastic DIP

SEMICONDUCTOR

TECHNICAL DATA

16

1

MOTOROLA ANALOG IC DEVICE DATA

High Performance

Resonant Mode Controllers

The MC34067/MC33067 are high performance zero voltage switch

resonant mode controllers designed for off–line and dc–to–dc converter

applications that utilize frequency modulated constant off–time or constant

deadtime control. These integrated circuits feature a variable frequency

oscillator, a precise retriggerable one–shot timer, temperature compensated

reference, high gain wide bandwidth error amplifier, steering flip–flop, and

dual high current totem pole outputs ideally suited for driving power

MOSFETs.

Also included are protective features consisting of a high speed fault

comparator, programmable soft–start circuitry, input undervoltage lockout

with selectable thresholds, and reference undervoltage lockout.

These devices are available in dual–in–line and surface mount packages.

• Zero Voltage Switch Resonant Mode Operation

• Variable Frequency Oscillator with a Control Range Exceeding 1000:1

• Precision One–Shot Timer for Controlled Off–Time

• Internally Trimmed Bandgap Reference

• 4.0 MHz Error Amplifier

• Dual High Current Totem Pole Outputs

• Selectable Undervoltage Lockout Thresholds with Hysteresis

• Enable Input

• Programmable Soft–Start Circuitry

• Low Startup Current for Off–Line Operation

Simplified Block Diagram

Noninverting

Input

11

8

6

16

3

2

1

Osc Charge

Enable /

UVLO Adjust

VCC

15

5

14

12

13

Vref UVLO

Error

Amp

VCC UVLO /

Enable

Fault Detector

2.5 V

Clamp

Soft–Start

One–Shot

Output B

Inverting Input

Soft–Start

7

Error Amp

Output

One–Shot

Oscillator

Control Current

Osc RC

9

Ground

4

Fault Input

10

Pwr Gnd

Output A

Vref

Variable

Frequency

Oscillator

Steering

Flip–Flop

5.0 V

Reference

Rev 1, 05/99

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