MC34025 ON Semiconductor, MC34025 Datasheet

MC34025

Manufacturer Part Number

MC34025

Description

(MC33025 / MC34025) High Speed Single-Ended PWM Controller

Manufacturer

ON Semiconductor

Datasheet

1.MC34025.pdf (20 pages)

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MC34025, MC33025

High Speed Double−Ended

PWM Controller

pulse width modulator controllers optimized for high frequency

operation. They are specifically designed for Off−Line and

DC−to−DC converter applications offering the designer a cost

effective solution with minimal external components. These

integrated circuits feature an oscillator, a temperature compensated

reference, a wide bandwidth error amplifier, a high speed current

sensing comparator, steering flip−flop, and dual high current totem

pole outputs ideally suited for driving power MOSFETs.

reference undervoltage lockouts each with hysteresis, cycle−by−cycle

current limiting, and a latch for single pulse metering.

either current mode or voltage mode control.

Features

•

Noninverting

October, 2005 − Rev. 7

Error Amp

Soft−Start

The MC34025 series are high speed, fixed frequency, double−ended

Also included are protective features consisting of input and

The flexibility of this series allows it to be easily configured for

50 ns Propagation Delay to Outputs

Dual High Current Totem Pole Outputs

Wide Bandwidth Error Amplifier

Fully−Latched Logic with Double Pulse Suppression

Latching PWM for Cycle−By−Cycle Current Limiting

Soft−Start Control with Latched Overcurrent Reset

Input Undervoltage Lockout with Hysteresis

Low Startup Current (500 mA Typ)

Internally Trimmed Reference with Undervoltage Lockout

45% Maximum Duty Cycle (Externally Adjustable)

Precision Trimmed Oscillator

Voltage or Current Mode Operation to 1.0 MHz

Functionally Similar to the UC3825

Pb−Free Packages are Available*

Inverting

Output

Ramp

Clock

Input

Input 1

ref

This device contains 227 active transistors.

Oscillator

Error

Amp

Figure 1. Simplified Application

Soft−Start

Reference

PWM and

Flip Flop

Latching

Steering

UVLO

5.1V

Ground

www.DataSheet4U.com

Power

Ground

Output B

Output A

Current

Limit/

Shutdown

See detailed ordering and shipping information in the package

dimensions section on page 18 of this data sheet.

*For additional information on our Pb−Free strategy

and soldering details, please download the

ON Semiconductor Soldering and Mounting

Techniques Reference Manual, SOLDERRM/D.

Noninverting Input

Error Amp Output

Inverting Input

ORDERING INFORMATION

Error Amp

Soft−Start

Ramp

Clock

http://onsemi.com

PIN CONNECTIONS

DW SUFFIX

CASE 751G

CASE 648

SO−16WB

= 3 or 4

= Assembly Location

= Wafer Lot

= Year

= Work Week

= Pb−Free Package

P SUFFIX

PDIP−16

(Top View)

Publication Order Number:

DIAGRAMS

MARKING

AWLYYWWG

MC3x025DW

Output B

Power Ground

Output A

Ground

Current Limit/

Shutdown

MC3x025P

ref

MC34025/D

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