NCP1225 Datasheet, PDF (1/6 Pages) ON Semiconductor – Low Standby Power SMPS Controller

NCP1225
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Low Standby Power
SMPS Controller
NCP1225 is a low standby power Switch−Mode Power Supply,
SMPS controller IC specially designed for low power AC−DC
adapter applications. The device operates in Discontinuous
Conduction Mode (DCM) with Pulse Frequency Modulation (PFM)
control scheme. PFM operation can provide high operating
efficiency even at light loading conditions and the device itself takes
extremely low operating current. With careful circuit design, low
standby power down to 300 mW can be achieved for universal line
input low power adapters. This specific feature can help the end
products to comply with immediate and future international power
saving regulations easily.
An innovative feedback compensation scheme is integrated in
NCP1225 to eliminate the expensive optocoupler in the feedback
path. By only using simple auxiliary winding feedback, the regulator
still can achieve good output voltage regulation usually not possible
with common SMPS controller ICs without optocoupler. For even
better regulation applications, optocoupler feedback can still be used
in place. Additionally, value−added features as overvoltage
protection, undervoltage lockout and overcurrent protection
functions are also included. This controller is an ideal solution for
low power adapters and mobile phone chargers. With all valuable
features, this device is available in the tiny TSOP−5 package.
Features
• Current Mode Operation
• Cycle−By−Cycle Current Limiting
• High Efficiency Pulse Frequency Modulation (PFM) Control
• Low Device Operating Current, 0.5 mA Typical
• No Optocoupler Feedback Control
• Extremely Low Standby Power
• Internal Leading Edge Blanking
• Input Undervoltage Lockout Protection
• Output Overvoltage Protection
• Optional Optocoupler Feedback
• Micro Miniature TSOP−5 Package
Typical Applications
• Low Power Wall Mount Adapters
• Mobile Phone Adapter Chargers
• TV/Computer Auxiliary Power Supply
http://onsemi.com
5
1
TSOP−5
SN SUFFIX
CASE 483
MARKING
DIAGRAM
5
TBD^M
1
TBD = Device Code
M = Date Code
PIN CONNECTIONS
V_CC 1
GND 2
5 GATE
VDRIVE 3
4 CS
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
TBD
TSOP−5
TBD
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
© Semiconductor Components Industries, LLC, 2003
1
November, 2003 − Rev. P0
Publication Order Number:
NCP1225/D