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MC44605
(Rev.:2000)

High Safety, Latched Mode, GreenLine PWM Controller for (Multi) Synchronized Applications

ON Semiconductor 

MC44605

Product Preview

High Safety, Latched Mode,

GreenLine™ PWM Controller

for (Multi)Synchronized

Applications

The MC44605 is a high performance current mode controller that is

specifically designed for off–line converters. This circuit has several

distinguishing features that make it particularly suitable for

multisynchronized monitor applications.

The MC44605 synchronization arrangement enables operation from

16 kHz up to 130 kHz. This product was optimized to operate with

universal mains voltage, i.e., from 80 V to 280 V, and its high current

totem pole output makes it ideally suited for driving a power MOSFET.

The MC44605 protections enable a well–controlled and safe power

management. Four major faults while detected, activate the analogic

counter of a disabling block designed to perform a latched circuit

output inhibition.

Current Mode Controller

• Current Mode 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 (Availability of Error Amplifier Output)

• Synchronization Facility

• High Current Totem Pole Output

• Vcc Undervoltage Lockout with Hysteresis

• Low Output dV/dT for Low EMI Radiations

• Low Start–Up and Operating Current

Safety/Protection Features

• Soft–Start Feature

• Demagnetization (Zero Current Detection) Protection

• Overvoltage Protection Facility against Open Loop

• EHT Overvoltage Protection (E.H.T.OVP): Detection of too High

Synchronization Pulses

• Winding Short Circuit Detection (W.S.C.D.)

• Limitation of the Maximum Input Power (M.P.L.): Calculation of

Input Power for Overload Protection

• Overheating Detection (O.H.D.): to Prevent the Power Switch from

an Excessive Heating

Latched Disabling Mode

• When one of the following faults is detected: EHT overvoltage,

Winding Short Circuit (WSCD), a too high input power (M.P.L.),

power switch overheating (O.H.D.), an analogic counter is activated

• If the counter is activated for a time that is long enough, the circuit

gets definitively disabled. The latch can only be reset by making

decrease the Vcc down to about 3 V, i.e., practically by unplugging or

turning off the SMPS.

This document contains information on a product under development. ON Semiconductor

reserves the right to change or discontinue this product without notice.

16

1

http://onsemi.com

PDIP–16

P SUFFIX

CASE 648

MARKING

DIAGRAM

16

MC44605P

AWLYYWW

1

A

= Assembly Location

WL, L = Wafer Lot

YY, Y = Year

WW, W = Work Week

PIN CONNECTIONS

VCC 1

16 Rref

VC 2

Output 3

Gnd 4

15 WSCD* Program

14 Voltage Feedback Input

13 Error Amp Output

Max Power Limitation 5

Overheating

Detection

6

Current Sense Input 7

Demagnetization

Detection Input

8

12 Disabling Block (Cext)

11 Soft–Start Input

10 Osc Capacitor (CT)

9

Sync and

EHTOVP Input

(Top View)

* Winding Short Circuit Detection

ORDERING INFORMATION

Device

Package

Shipping

MC44605P

PDIP–16

25 Units/Rail

© Semiconductor Components Industries, LLC, 2000

1

May, 2000 – Rev. 2

Publication Order Number:

MC44605/D

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