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High Safety Latched Mode GreenLineTM PWM Controller for (Multi)Synchronized Applications
The is a high performance current mode controller that is specifically designed for offline 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 to 130 kHz. This product was optimized to operate with universal ac mains voltage from 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 ControllerHIGH SAFETY LATCHED MODE GREENLINETM PWM CONTROLLER FOR (MULTI)SYNCHRONIZED APPLICATIONS
Current Mode Operation to 250 kHz Output Switching Frequency Inherent Feed Forward Compensation Latching PWM for CyclebyCycle 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 PIN CONNECTIONS
VCC VC Output Gnd Max Power Limitation Over Heating Detection Current Sense Input Demagnetization Detection Input
Safety/Protection Features SoftStart 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
16 Rref 15 WSCD* Program 14 Voltage Feedback Input 13 Error Amp Output 12 Disabling Block (Cext) 11 SoftStart Input 10 Osc Capacitor (CT) 9 Sync and
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 reapplying powerDevice MC44605P Operating Temperature Range to +85°C Package Plastic DIP
This document contains information on a product under development. Motorola reserves the right to change or discontinue thisIC product without notice. MOTOROLA ANALOG DEVICE DATA © Motorola, Inc. 1996 Issue 0
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS WHEN FORMED PARALLEL. 4. DIMENSION B DOES NOT INCLUDE MOLD FLASH. 5. ROUNDED CORNERS OPTIONAL. DIM INCHES MIN MAX BSC 0.050 BSC MILLIMETERS MIN MAX BSC 1.27 BSC
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