MC44605 Datasheet, PDF (1/2 Pages) ON Semiconductor – High Safety, Latched Mode, GreenLine PWM Controller for (Multi)Synchronized Applications

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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. The MC44605 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 ac mains voltage 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 provide well controlled, safe power
management. Safety enhancements detect four different fault conditions
and provide protection through a disabling latch.
Current or Voltage 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
• Undervoltage Lockout with Hysteresis
• Low Output dV/dT for Low EMI
• Low Startup 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): Protection Against Excessive
Amplitude 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
• Over Heating Detection (O.H.D.): to Prevent the Power Switch from
Excessive Heating
Latched Disabling Mode
• When one of the following faults is detected: EHT overvoltage, Winding
Short Circuit (WSCD), excessive input power (M.P.L.), power switch
over heating (O.H.D.), a 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 removing and then
re–applying power
GreenLine is a trademark of Motorola, Inc.
MC44605
HIGH SAFETY LATCHED
MODE GREENLINE™
PWM CONTROLLER FOR
(MULTI)SYNCHRONIZED
APPLICATIONS
SEMICONDUCTOR
TECHNICAL DATA
16
1
P SUFFIX
PLASTIC PACKAGE
CASE 648
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
Over Heating
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
Operating
Temperature Range
Package
MC44605P TA = –25° to +85°C Plastic DIP
This document contains information on a product under development. Motorola reserves the
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© Motorola, Inc. 1996
Issue 0
1