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NCP1212 Folha de dados(PDF) 1 Page - ON Semiconductor

Nome de Peças NCP1212
Descrição Electrónicos  Current Mode PWM Controller for Both Forward and Flyback Converters
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Fabricante Electrônico  ONSEMI [ON Semiconductor]
Página de início  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1212 Folha de dados(HTML) 1 Page - ON Semiconductor

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© Semiconductor Components Industries, LLC, 2004
October, 2004 − Rev. 2
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
Pb−Free Package is Available
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
Typical Applications
ATX PC Power Supply
Universal Input Wall Mount Adaptors
CRT Monitor
All Flyback and Forward SMPS Systems
PDIP−8
P SUFFIX
CASE 626
1
8
1
8
SOIC−8
D SUFFIX
CASE 751
18
5
3
4
(Top View)
FB
CS
SS/DMAX
PIN CONNECTIONS
7
6
2
VCC
BOK
CT
GND
DRV
MARKING
DIAGRAMS
A
= Assembly Location
WL, L
= Wafer Lot
YY, Y
= Year
WW, W = Work Week
N1212
ALYW
NCP1212
AWL
YYWW
1
8
Device
Package
Shipping
ORDERING INFORMATION
NCP1212DR2
SOIC−8
2500 Tape & Reel
NCP1212P
PDIP−8
50 Units/Rail
http://onsemi.com
NCP1212PG
PDIP−8
(Pb−Free)
50 Units/Rail
†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.
1
8


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