MC44608 Datasheet, PDF (1/16 Pages) ON Semiconductor – Few External Components Reliable Flexible GreenLine Very High Voltage PWM Controller

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
General Features
• Flexibility
• Duty Cycle Control
• Undervoltage Lockout with Hysteresis
• On Chip Oscillator Switching Frequency 40, or 75kHz
• Secondary Control with Few External Components
Protections
• Maximum Duty Cycle Limitation
• Cycle by Cycle Current Limitation
• Demagnetization (Zero Current Detection) Protection
• “Over VCC Protection” Against Open Loop
• _{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
http://onsemi.com
8
1
DIP–8
P SUFFIX
CASE 626
PIN CONNECTIONS AND
MARKING DIAGRAM
Demag 1
Isense 2
Control Input 3
Gnd 4
8 Vi
7
6 _Vcc
5 Driver
AWL = Manufacturing Code
YYWW = Date Code
(Top View)
ORDERING INFORMATION
Device
MC44608P40
Switching Package Shipping
Frequency
40kHz
Plastic _{50 / Rail}
DIP–8
MC44608P75
75kHz
Plastic _{50 / Rail}
DIP–8
© Semiconductor Components Industries, LLC, 1999
1
January, 2000 – Rev. 2
Publication Order Number:
MC44608/D