NCP1215
Product Preview
Low Cost Variable OFF Time
Switched Mode Power
Supply Controller
The NCP1215 is a controller for low power off鈭抣ine flyback
Switchemode Power Supplies (SMPS) featuring low size, weight and
cost constraints together with a good low standby power performance.
The operating principle uses switching frequency reduction at light
load by increasing the OFF Time. Also, when OFF Time expands, the
peak current is gradually reduced down to approximately 1/4 of the
maximum peak current to prevent from exciting the transformer
mechanical resonances. The risk of acoustic noise is thus greatly
diminished while keeping good standby power performance.
A low power internal supply block also ensures very low current
consumption at startup without hampering the standby power
performance.
A special primary current sensing technique minimizes the impact
of SMPS switching on control IC operation. The choice of peak
voltage across the current sense resistor allows dissipation to be
further reduced. The negative current sensing technique offers
advantages over a traditional approach by avoiding the voltage drop
incurred by traditional MOSFET source sensing. Thus, the IC drive
capability is greatly improved.
Finally, the bulk input ripple ensures a natural frequency dithering
which smooths the EMI signature.
Features
http://onsemi.com
MARKING
DIAGRAMS
8
8
1
SOIC鈭?
D SUFFIX
CASE 751
1
6
TSOP鈭?
(SOT23鈭?, SC59鈭?)
SN SUFFIX
CASE 318G
1
FAA
A
L
Y
W
P1215
ALYW
6
1
FAAYW
= Specific Device Code
= Assembly Location
= Wafer Lot
= Work Week
PIN CONNECTIONS
SOIC鈭?
FB 1
8
7
6
5
(Top View)
TSOP鈭?
CS
GND
CT
1
2
3
(Top View)
6
5
4
Gate
V
CC
FB
NC
NC
V
CC
Gate
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CT 2
CS 3
GND
4
Pb鈭扚ree Package is Available
Variable OFF Time Control Method
Very Low Current Consumption at Startup
Natural Frequency Dithering for Improved EMI Signature
Current Mode Control Operation
Peak Current Compression Reduces Transformer Noise
Programmable Current Sense Resistor Peak Voltage
Undervoltage Lockout
Typical Applications
Auxiliary Power Supply
Standby Power Supply
AC鈭扗C Adapter
Off鈭抣ine Battery Charger
ORDERING INFORMATION
Device
NCP1215DR2
NCP1215DR2G
NCP1215SNT1
Package
SOIC鈭?
SOIC鈭?
(Pb鈭扚ree)
TSOP鈭?
Shipping
鈥?/div>
2500 Tape & Reel
2500 Tape & Reel
3000 Tape & Reel
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
鈥燜or information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Publication Order Number:
NCP1215/D
漏
Semiconductor Components Industries, LLC, 2004
1
October, 2004 鈭?Rev. 2
NCP1215DR2相關(guān)型號PDF文件下載
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