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NCP1212 Datasheet(PDF) 1 Page - ON Semiconductor

Part No. NCP1212
Description  Current Mode PWM Controller for Both Forward and Flyback Converters
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1212 Datasheet(HTML) 1 Page - ON Semiconductor

 
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© Semiconductor Components Industries, LLC, 2005
September, 2005 − Rev. 3
1
Publication Order Number:
NCP1212/D
NCP1212
Current Mode PWM
Controller for Both Forward
and Flyback Converters
NCP1212 is a high performance current mode PWM controller
specifically designed for off−line and DC−to−DC converter
applications. The device requires very few external components and
offers designer additional protection for better system reliability. The
device features a trimmed oscillator for precise Duty Cycle control,
accurate bandgap voltage reference, high gain error amplifier, current
sensing comparator and a high current totem pole output gate driver
that ideally drives the external power MOSFET. Additionally, the
device has built−in programmable Brownout Detect and Soft−Start
features to enhance system reliability. Also, the 48%/82% selectable
maximum turn on Duty Cycle control and external programmable
switching frequency capabilities make this device an ideal controller
for both forward and flyback configurations. This device is available
in both PDIP−8 and space saving SOIC−8 packages.
Features
Trimmed Oscillator Charge and Discharge Current for Precise Duty
Cycle Control
Internal High Accuracy Bandgap Voltage Reference
Current Mode Operation up to 200 kHz
Inherent Feed Forward Compensation
Latching PWM for Cycle−by−Cycle Current Limiting
High Current Totem Pole Output Gate Driver
Low Startup and Operating Current
Internal Undervoltage Lockout with Hysteresis
Internal Leading Edge Blanking for Current Feedback
Direct Interface with Optocoupler for Secondary Sensing
Built−in Soft−Start Function, Programmable by External Capacitor
User Programmable 48%/82% Maximum Duty Cycle Selection
Output Overvoltage Protection Against Open Loop
AC Line Brownout Detect Protection
Output Overload Protection Irrespective of Auxiliary Voltage Level
Pb−Free Packages are Available
Typical Applications
ATX PC Power Supply
Universal Input Wall Mount Adaptors
CRT Monitor
All Flyback and Forward SMPS Systems
MARKING
DIAGRAM
A
= Assembly Location
L, WL
= Wafer Lot
Y, YY
= Year
W, WW
= Work Week
G
= Pb−Free Package
G
= Pb−Free Package
http://onsemi.com
PDIP−8
N SUFFIX
CASE 626
1
8
1
8
SOIC−8
DSUFFIX
CASE 751
NCP1212
AWL
YYWWG
1
8
Device
Package
Shipping
ORDERING INFORMATION
NCP1212DR2
SOIC−8
2500/Tape & Reel
NCP1212P
PDIP−8
50 Units / Rail
NCP1212DR2G
SOIC−8
(Pb−Free)
2500/Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
N1212
ALYW
G
1
8
NCP1212PG
PDIP−8
(Pb−Free)
50 Units / Rail
18
5
3
4
(Top View)
FB
CS
SS/DMAX
PIN CONNECTIONS
7
6
2
VCC
BOK
CT
GND
DRV


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