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MC44608
Few External Components
Reliable and Flexible
GreenLine Very High Voltage
PWM 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 1W while delivering 300mW in a 150W SMPS.
• Integrated Start–Up Current Source
• Lossless Off–Line Start–Up
• Direct Off–Line Operation
• Fast Start–Up
http://onsemi.com
8
1
DIP–8
P SUFFIX
CASE 626
PIN CONNECTIONS AND
MARKING DIAGRAM
General Features
Flexibility
Duty Cycle Control
Undervoltage Lockout with Hysteresis
On Chip Oscillator Switching Frequency 40, or 75kHz
Secondary Control with Few External Components
Demag
1
8
Isense
2
7
Control Input
3
Gnd
4
44608Pxxx
AWL
YYWW





Vi
6
Vcc
5
Driver
Protections






AWL = Manufacturing Code
YYWW = Date Code
Maximum Duty Cycle Limitation
Cycle by Cycle Current Limitation
Demagnetization (Zero Current Detection) Protection
“Over VCC Protection” Against Open Loop
(Top View)
Programmable Low Inertia Over Voltage Protection Against Open Loop
Internal Thermal Protection
GreenLine Controller
• Pulsed Mode Techniques for a Very High Efficiency Low Power


Mode
Lossless Startup
Low dV/dT for Low EMI Radiations
 Semiconductor Components Industries, LLC, 1999
January, 2000 – Rev. 2
1
ORDERING INFORMATION
Device
Switching Package
Frequency
Shipping
MC44608P40
40kHz
Plastic
DIP–8
50 / Rail
MC44608P75
75kHz
Plastic
DIP–8
50 / Rail
Publication Order Number:
MC44608/D
MC44608
REPRESENTATIVE BLOCK DIAGRAM