MC34060ADR2 datasheet(5/16 Pages) ONSEMI

Part #	MC34060ADR2

Description	Fixed Frequency, PWM, Voltage Mode Single Ended Controllers

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Manufacturer	ONSEMI [ON Semiconductor]

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MC34060A, MC33060A

http://onsemi.com

5

Figure 1. Block Diagram

+

6

5

4

RT

CT

Dead−Time

Control

Oscillator

0.12V

0.7V

≈ 0.7mA

1

12

3

2

Dead−Time

Comparator

PWM.

Comparator

13

14

Reference

Regulator

7

GND

10

12

9

8

Q1

Ref Out

VCC

Error Amp

1

Feedback/PWM

Comparator Input

Error Amp

2

+

++

−

−−

Emitter

Collector

+

−

VTH

Undervoltage

Lockout

This device contains 46 active transistors.

Description

The MC34060A is a fixed−frequency pulse width

modulation control circuit, incorporating the primary

building blocks required for the control of a switching power

supply (see Figure 1). An internal−linear sawtooth oscillator

is frequency−programmable by two external components,

RT and CT. The approximate oscillator frequency is

determined by:

fosc ^

1.2

RT • CT

For more information refer to Figure 3.

Output pulse width modulation is accomplished by

comparison of the positive sawtooth waveform across

capacitor CT to either of two control signals. The output is

enabled only during that portion of time when the sawtooth

voltage is greater than the control signals. Therefore, an

increase in control−signal amplitude causes a corresponding

linear decrease of output pulse width. (Refer to the Timing

Diagram shown in Figure 2.)

Figure 2. Timing Diagram

Capacitor CT

Feedback/P.W.M.

Comparator

Dead−Time Control

Output Q1,

Emitter

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MC34060ADR2 Datasheet(PDF) 5 Page - ON Semiconductor

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