MC33060A datasheet(5/16 Pages) ONSEMI

tên linh kiện	MC33060A

Giải thích chi tiết về linh kiện	Fixed Frequency, PWM, Voltage Mode Single Ended Controllers

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MC34060A, MC33060A

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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

Số phần tương tự - MC33060A

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
ON Semiconductor	MC33060AD	187Kb / 16P	Fixed Frequency, PWM, Voltage Mode Single Ended Controllers October, 2006 ??Rev. 5
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	MC33060ADR2	187Kb / 16P	Fixed Frequency, PWM, Voltage Mode Single Ended Controllers October, 2006 ??Rev. 5
	MC33060ADR2G	187Kb / 16P	Fixed Frequency, PWM, Voltage Mode Single Ended Controllers October, 2006 ??Rev. 5
	MC33060AP	187Kb / 16P	Fixed Frequency, PWM, Voltage Mode Single Ended Controllers October, 2006 ??Rev. 5

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Mô tả tương tự - MC33060A

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
ON Semiconductor	MC34060A	187Kb / 16P	Fixed Frequency, PWM, Voltage Mode Single Ended Controllers October, 2006 ??Rev. 5
ON Semiconductor	MC34060A	159Kb / 16P	Fixed Frequency, PWM Voltage Mode Single Ended Controllers March, 2011 ??Rev. 7
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Maxim Integrated Produc...	MAX5070	365Kb / 22P	High-Performance, Single-Ended, Current-Mode PWM Controllers Rev 3; 10/06
Maxim Integrated Produc...	MAX5094A	296Kb / 22P	High-Performance, Single-Ended, Current-Mode PWM Controllers Rev 3; 10/06
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Microsemi Corporation	LX1681	125Kb / 9P	VOLTAGE - MODE PWM CONTROLLERS
Microsemi Corporation	LX1681	205Kb / 9P	Voltage-Mode PWM Controllers
Intersil Corporation	ISL6741IVZ-T	963Kb / 28P	Flexible Double Ended Voltage and Current Mode PWM Controllers

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