NCP1215
Product Preview
Low Cost Variable OFF Time
Switched Mode Power
Supply Controller
The NCP1215 is a controller for low power off-line flyback
Switched Mode 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 start-up 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
SO-8
D SUFFIX
CASE 751
1
1
6
TSOP-6
(SOT23-6, SC59-6)
SN SUFFIX
CASE 318G
1
FAA
A
L
Y
W
P1215
ALYW
8
6
1
FAAYW
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
PIN CONNECTIONS
SO-8
FB 1
CT 2
CS 3
GND
4
(Top View)
TSOP-6
CS
GND
CT
1
2
3
(Top View)
6
5
4
Gate
V
CC
FB
8
7
6
5
NC
NC
V
CC
Gate
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Variable OFF Time Control Method
Very Low Current Consumption at Start-up
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
Auxiliary Power Supply
Stand-by Power Supply
AC/DC Adapter
Off-line Battery Charger
Typical Applications
ORDERING INFORMATION
Device
NCP1215DR2
NCP1215SNT1
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
Package
SO-8
TSOP-6
Shipping
2500 Tape & Reel
3000 Tape & Reel
漏
Semiconductor Components Industries, LLC, 2003
1
May, 2003 - Rev. 0
Publication Order Number:
NCP1215/D
NCP1215-D相關型號PDF文件下載
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