MC44603 데이터 시트보기 (PDF) - Motorola => Freescale

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MC44603

Mixed frequency mode greenline PWW controller

Motorola => Freescale 

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MC44603

Advance Information

Mixed Frequency Mode

GreenLine™ PWM Controller:

Fixed Frequency, Variable Frequency,

Standby Mode

The MC44603 is an enhanced high performance controller that is

specifically designed for off–line and dc–to–dc converter applications. This

device has the unique ability of automatically changing operating modes if

the converter output is overloaded, unloaded, or shorted, offering the

designer additional protection for increased system reliability. The MC44603

has several distinguishing features when compared to conventional SMPS

controllers. These features consist of a foldback facility for overload

protection, a standby mode when the converter output is slightly loaded, a

demagnetization detection for reduced switching stresses on transistor and

diodes, and a high current totem pole output ideally suited for driving a power

MOSFET. It can also be used for driving a bipolar transistor in low power

converters (< 150 W). It is optimized to operate in discontinuous mode but

can also operate in continuous mode. Its advanced design allows use in

current mode or voltage mode control applications.

Current or Voltage Mode Controller

• Operation up to 250 kHz Output Switching Frequency

• Inherent Feed Forward Compensation

• Latching PWM for Cycle–by–Cycle Current Limiting

• Oscillator with Precise Frequency Control

High Flexibility

• Externally Programmable Reference Current

• Secondary or Primary Sensing

• Synchronization Facility

• High Current Totem Pole Output

• Undervoltage Lockout with Hysteresis

Safety/Protection Features

• Overvoltage Protection Against Open Current and Open Voltage Loop

• Protection Against Short Circuit on Oscillator Pin

• Fully Programmable Foldback

• Soft–Start Feature

• Accurate Maximum Duty Cycle Setting

• Demagnetization (Zero Current Detection) Protection

• Internally Trimmed Reference

GreenLine Controller: Low Power Consumption in Standby Mode

• Low Startup and Operating Current

• Fully Programmable Standby Mode

• Controlled Frequency Reduction in Standby Mode

• Low dV/dT for Low EMI Radiations

MIXED FREQUENCY MODE

GREENLINE PWM*

CONTROLLER:

VARIABLE FREQUENCY,

FIXED FREQUENCY,

STANDBY MODE

* PWM = Pulse Width Modulation

16

1

P SUFFIX

PLASTIC PACKAGE

CASE 648

16

1

DW SUFFIX

PLASTIC PACKAGE

CASE 751G

(SOP–16L)

PIN CONNECTIONS

VCC 1

VC 2

Output 3

Gnd 4

Foldback Input 5

Overvoltage

Protection (OVP)

6

Current Sense Input 7

Demag Detection 8

16 Rref

15

RFrequency

Standby

14

Voltage Feedback

Input

13 Error Amp Output

12 RPower Standby

11

Soft–Start/Dmax/

Voltage Mode

10 CT

9 Sync Input

(Top View)

ORDERING INFORMATION

Device

Operating

Temperature Range Package

GreenLine is a trademark of Motorola, Inc.

MC44603P

Plastic DIP–16

TA = –25° to +85°C

MC44603DW

SOP–16L

This document contains information on a new product. Specifications and information herein

areMsOubTjeOctRtoOcLhaAngAe NwiAthoLuOt nGotiIcCe. DEVICE DATA

© Motorola, Inc. 1996

Rev 0

1

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