MC44605 Datasheet, PDF (1/20 Pages) ON Semiconductor – High Safety, Latched Mode, GreenLine PWM Controller for (Multi)Synchronized Applications

MC44605
Product Preview
High Safety, Latched Mode,
GreenLine™ PWM Controller
for (Multi)Synchronized
Applications
The MC44605 is a high performance current mode controller that is
specifically designed for off–line converters. This circuit has several
distinguishing features that make it particularly suitable for
multisynchronized monitor applications.
The MC44605 synchronization arrangement enables operation from
16 kHz up to 130 kHz. This product was optimized to operate with
universal mains voltage, i.e., from 80 V to 280 V, and its high current
totem pole output makes it ideally suited for driving a power MOSFET.
The MC44605 protections enable a well–controlled and safe power
management. Four major faults while detected, activate the analogic
counter of a disabling block designed to perform a latched circuit
output inhibition.
Current Mode Controller
• Current Mode 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
• Externally Programmable Reference Current
• Secondary or Primary Sensing (Availability of Error Amplifier Output)
• Synchronization Facility
• High Current Totem Pole Output
• Vcc Undervoltage Lockout with Hysteresis
• Low Output dV/dT for Low EMI Radiations
• Low Start–Up and Operating Current
Safety/Protection Features
• Soft–Start Feature
• Demagnetization (Zero Current Detection) Protection
• Overvoltage Protection Facility against Open Loop
• EHT Overvoltage Protection (E.H.T.OVP): Detection of too High
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
• Overheating Detection (O.H.D.): to Prevent the Power Switch from
an Excessive Heating
Latched Disabling Mode
• When one of the following faults is detected: EHT overvoltage,
Winding Short Circuit (WSCD), a too high input power (M.P.L.),
power switch overheating (O.H.D.), an analogic 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 making
decrease the Vcc down to about 3 V, i.e., practically by unplugging or
turning off the SMPS.
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
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1
http://onsemi.com
PDIP–16
P SUFFIX
CASE 648
MARKING
DIAGRAM
16
MC44605P
AWLYYWW
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 WSCD* Program
14 Voltage Feedback Input
13 ^{Error Amp Output}
Max Power Limitation 5
Overheating
Detection
6
Current Sense Input 7
Demagnetization
Detection Input
8
12 Disabling Block (Cext)
11 Soft–Start Input
10 Osc Capacitor (CT)
9
Sync and
EHTOVP Input
(Top View)
* Winding Short Circuit Detection
ORDERING INFORMATION
Device
Package
Shipping
MC44605P
PDIP–16
25 Units/Rail
© Semiconductor Components Industries, LLC, 2000
1
May, 2000 – Rev. 2
Publication Order Number:
MC44605/D