MC44605_06 Datasheet, PDF (1/20 Pages) ON Semiconductor – High Safety, Latched Mode, GreenLine TM PWM Controller for (Multi) Synchronized Applications

MC44605
High Safety, Latched Mode,
GreenLinet 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.
Features
• Pb−Free Package is Available*
http://onsemi.com
MARKING
DIAGRAM
16
PDIP−16
P SUFFIX
CASE 648
MC44605P
AWLYYWWG
1
1
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
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
• V_cc Undervoltage Lockout with Hysteresis
• Low Output dV/dT for Low EMI Radiations
• Low Startup 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
PIN CONNECTIONS
V_{CC 1}
16 ^Rref
V_C 2
Output 3
GND ₄
Max Power Limitation 5
Overheating
Detection
6
Current Sense Input 7
Demagnetization
Detection Input
8
15 WSCD* Program
14 Voltage Feedback Input
13 ^{Error Amp Output}
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
MC44605PG
PDIP−16
PDIP−16
(Pb−Free)
25 Units/Rail
25 Units/Rail
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 V_cc down to about 3.0 V, i.e., practically by unplugging
or turning off the SMPS.
*For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2006
1
June, 2006 − Rev. 5
Publication Order Number:
MC44605/D