mc44603 ON Semiconductor, mc44603 Datasheet

mc44603

Manufacturer Part Number

mc44603

Description

Mixed Frequency Mode Greenline Pwm Controller

Manufacturer

ON Semiconductor

Datasheet

1.MC44603.pdf (24 pages)

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Download datasheet (329Kb)

Mixed Frequency Mode

GreenLine PWM Controller:

Fixed Frequency, Variable Frequency,

Standby Mode

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

High Flexibility

Safety/Protection Features

GreenLine Controller: Low Power Consumption in Standby Mode

GreenLine is a trademark of Motorola, Inc.

MOTOROLA ANALOG IC DEVICE DATA

The MC44603 is an enhanced high performance controller that is

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

Externally Programmable Reference Current

Secondary or Primary Sensing

Synchronization Facility

High Current Totem Pole Output

Undervoltage Lockout with Hysteresis

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

Low Startup and Operating Current

Fully Programmable Standby Mode

Controlled Frequency Reduction in Standby Mode

Low dV/dT for Low EMI Radiations

MC44603P

MC44603DW

Motorola, Inc. 1999

Current Sense Input

Device

Demag Detection

Protection (OVP)

MIXED FREQUENCY MODE

Foldback Input

Overvoltage

VARIABLE FREQUENCY,

ORDERING INFORMATION

Output

GREENLINE PWM*

V CC

FIXED FREQUENCY,

Gnd

MC44603

V C

* PWM = Pulse Width Modulation

CONTROLLER:

PIN CONNECTIONS

STANDBY MODE

Order this document by MC44603/D

Temperature Range

PLASTIC PACKAGE

T A = –25 to +85 C

DW SUFFIX

CASE 751G

Operating

(SOP–16L)

CASE 648

P SUFFIX

(Top View)

R ref

R Frequency

Standby

Voltage Feedback

Input

Error Amp Output

R Power Standby

Soft–Start/D max /

Voltage Mode

C T

Sync Input

Plastic DIP–16

SOP–16L

Package

Rev 1

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