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MC44608
Few External Components
Reliable and Flexible
SMPS Controller
The MC44608 is a high performance voltage mode controller
designed for off−line converters. This high voltage circuit that
integrates the start−up current source and the oscillator capacitor,
requires few external components while offering a high flexibility and
reliability.
The device also features a very high efficiency stand−by
management consisting of an effective Pulsed Mode operation. This
technique enables the reduction of the stand−by power consumption to
approximately 1.0 W while delivering 300 mW in a 150 W SMPS.
Integrated Start−Up Current Source
Lossless Off−Line Start−Up
Direct Off−Line Operation
Fast Start−Up
General Features
Flexibility
Duty Cycle Control
Undervoltage Lockout with Hysteresis
On Chip Oscillator Switching Frequency 40, 75, or 100 kHz
Secondary Control with Few External Components
Protections
Maximum Duty Cycle Limitation
Cycle by Cycle Current Limitation
Demagnetization (Zero Current Detection) Protection
"Over V
Protection" Against Open Loop
CC
Programmable Low Inertia Over Voltage Protection
Against Open Loop
Internal Thermal Protection
SMPS Controller
Pulsed Mode Techniques for a Very High Efficiency
Low Power Mode
Lossless Startup
Low dV/dT for Low EMI Radiations
8
1
PDIP−8
P SUFFIX
CASE 626
PIN CONNECTIONS AND
MARKING DIAGRAM
Demag
1
I
2
sense
Control Input
3
(Top View)
GND
4
(Top View)
AWL
= Manufacturing Code
YYWW = Date Code
ORDERING INFORMATION
Switching
Device
Frequency
MC44608P40
40 kHz
MC44608P75
75 kHz
MC44608P100
100 kHz
8
V
i
7
6
V
CC
5
Driver
Package
Shipping
Plastic
50/Rail
DIP−8
Plastic
50/Rail
DIP−8
Plastic
50/Rail
DIP−8
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