NCP1225
Product Preview
Low Standby Power
SMPS Controller
NCP1225 is a low standby power Switch鈭扢ode Power Supply,
SMPS controller IC specially designed for low power AC鈭扗C
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鈭抋dded 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鈭? package.
Features
http://onsemi.com
MARKING
DIAGRAM
5
5
1
TSOP鈭?
SN SUFFIX
CASE 483
TBD = Device Code
M = Date Code
TBD
M
1
PIN CONNECTIONS
V
CC
GND
VDRIVE
1
2
3
(Top View)
4
CS
5
GATE
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Current Mode Operation
Cycle鈭払y鈭扖ycle 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鈭? Package
ORDERING INFORMATION
Device
TBD
Package
TSOP鈭?
Shipping
TBD
Typical Applications
鈥?/div>
Low Power Wall Mount Adapters
鈥?/div>
Mobile Phone Adapter Chargers
鈥?/div>
TV/Computer Auxiliary Power Supply
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
漏
Semiconductor Components Industries, LLC, 2003
1
November, 2003 鈭?Rev. P0
Publication Order Number:
NCP1225/D
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