MC44604 Datasheet, PDF (1/24 Pages) ON Semiconductor – High Safety Pulsed Mode Stanby GreenLine PWM Controller

MC44604
Advance Information
High Safety Pulsed Mode
Standby GreenLine™
PWM Controller
The MC44604 is an enhanced high performance controller that is
specifically designed for off–line and dc–to–dc converter applications.
Its high current totem pole output is ideally suited for driving a power
MOSFET.
The MC44604 is an evolution of the MC44603A. Like the
MC44603A, the MC44604 has been optimized to operate with
universal ac mains voltage from 80 V to 280 V. It also offers enhanced
safety and reliable power management thanks to its protection features
(foldback, overvoltage detection, soft–start, accurate demagnetization
detection).
In addition, the MC44604 offers a new efficient way to reduce the
standby operating power by means of a so–called pulsed mode
standby operation of the converter, significantly reducing the
converter consumption in standby mode.
Current Mode Controller
• 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
High Flexibility
• Externally Programmable Reference Current
• Secondary or Primary Sensing
• High Current Totem Pole Output
• Undervoltage Lockout with Hysteresis
Safety/Protection Features
• Overvoltage Protection Facility Against Open Loop
• Protection Against Short Circuit on Oscillator Pin
• Fully Programmable Foldback
• Soft–Start Feature
• Accurate Maximum Duty Cycle Setting
• Demagnetization (Zero Current Detection) Protection
• Internally Trimmed Reference
GreenLine™ Controller™
• Low Start–Up and Operating Current
• Pulsed Mode Standby for Low Standby Losses
• Low dV/dT for Low EMI
16
1
http://onsemi.com
PDIP–16
P SUFFIX
CASE 648
MARKING
DIAGRAM
16
MC44604P
AWLLYYWW
1
A
= Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
PIN CONNECTIONS
VCC ₁
16 ^Rref
VC 2
Output 3
Gnd ₄
15 Standby Management
14 Error Amp Input
13 ^{Error Amp Output}
Foldback Input 5
Overvoltage
Protection
6
Current Sense Input 7
Demagnetization
Detection Input
8
12 Clamp Error Amp Input
11
Soft–Start/Dmax/
Voltage Mode
10 CT
9
Standby
Current Set
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
MC44604P
PDIP–16
25 Units/Rail
This document contains information on a new product. Specifications and information
herein are subject to change without notice.
© Semiconductor Components Industries, LLC, 2000
1
April, 2000 – Rev. 2
Publication Order Number:
MC44604/D