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NCP1252_16 Datasheet, PDF (1/20 Pages) ON Semiconductor – Current Mode PWM Controller for Forward and Flyback Applications | |||
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NCP1252
Current Mode PWM
Controller for Forward and
Flyback Applications
The NCP1252 controller offers everything needed to build costâ
effective and reliable acâdc switching supplies dedicated to ATX
power supplies. Thanks to the use of an internally fixed timer,
NCP1252 detects an output overload without relying on the auxiliary
Vcc. A BrownâOut input offers protection against low input voltages
and improves the converter safety. Finally a SOICâ8 package saves
PCB space and represents a solution of choice in cost sensitive project.
Features
⢠Peak Current Mode Control
⢠Adjustable Switching Frequency up to 500 kHz
⢠Jittering Frequency ±5% of the Switching Frequency
⢠Latched Primary Over Current Protection with 10 ms Fixed Delay
⢠Delay Extended to 150 ms in E Version
⢠Delayed Operation Upon Startâup via an Internal Fixed Timer
(A, B and C versions only)
⢠Adjustable Softâstart Timer
⢠Autoârecovery BrownâOut Detection
⢠UC384Xâlike UVLO Thresholds
⢠Vcc Range from 9 V to 28 V with Autoârecovery UVLO
⢠Internal 160 ns Leading Edge Blanking
⢠Adjustable Internal Ramp Compensation
⢠+500 mA / â800 mA Source / Sink Capability
⢠Maximum 50% Duty Cycle: A Version
⢠Maximum 80% Duty Cycle: B Version
⢠Maximum 65% Duty Cycle: C Version
⢠Maximum 47.5% Duty Cycle: D & E Versions
⢠Ready for Updated No Load Regulation Specifications
⢠SOICâ8 and PDIPâ8 Packages
⢠These are PbâFree Devices
Typical Applications
⢠Power Supplies for PC Silver Boxes, Games Adapter...
⢠Flyback and Forward Converter
www.onsemi.com
OFFLINE CONTROLLER
8
1
SOICâ8
CASE 751
SUFFIX D
PDIPâ8
CASE 626
SUFFIX P
PIN CONNECTIONS
FB
1
BO
CS
RT
SS
VCC
DRV
GND
(Top View)
MARKING DIAGRAMS
8
1252x
ALYWX
G
1
1252AP
AWL
YYWWG
x
= A, B, C, D or E
A
= Assembly Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
G or G = PbâFree Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
© Semiconductor Components Industries, LLC, 2016
1
January, 2016 â Rev. 7
Publication Order Number:
NCP1252/D
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