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NCP1207A_06 Datasheet(PDF) 1 Page - ON Semiconductor

Part No. NCP1207A_06
Description  PWM Current−Mode Controller for Free Running Quasi−Resonant Operation
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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© Semiconductor Components Industries, LLC, 2006
October, 2006 − Rev. 3
1
Publication Order Number:
NCP1207A/D
NCP1207A
PWM Current−Mode
Controller for Free Running
Quasi−Resonant Operation
The NCP1207A combines a true current mode modulator and a
demagnetization detector to ensure full borderline/critical Conduction
Mode in any load/line conditions and minimum drain voltage switching
(Quasi−Resonant operation). Due to its inherent skip cycle capability,
the controller enters burst mode as soon as the power demand falls
below a predetermined level. As this happens at low peak current, no
audible noise can be heard. An internal 8.0
ms timer prevents the
free−run frequency to exceed 100 kHz (therefore below the 150 kHz
CISPR−22 EMI starting limit), while the skip adjustment capability lets
the user select the frequency at which the burst foldback takes place.
The Dynamic Self−Supply (DSS) drastically simplifies the
transformer design in avoiding the use of an auxiliary winding to
supply the NCP1207A. This feature is particularly useful in
applications where the output voltage varies during operation (e.g.
battery chargers). Due to its high−voltage technology, the IC is
directly connected to the high−voltage DC rail. As a result, the
short−circuit trip point is not dependent upon any VCC auxiliary level.
The transformer core reset detection is done through an auxiliary
winding which, brought via a dedicated pin, also enables fast
Overvoltage Protection (OVP). Once an OVP has been detected, the
IC permanently latches off.
Finally, the continuous feedback signal monitoring implemented
with an overcurrent fault protection circuitry (OCP) makes the final
design rugged and reliable.
Features
Free−Running Borderline/Critical Mode Quasi−Resonant Operation
Current−Mode with Adjustable Skip−Cycle Capability
No Auxiliary Winding VCC Operation
Auto−Recovery Overcurrent Protection
Latching Overvoltage Protection
External Latch Triggering, e.g. Via Overtemperature Signal
500 mA Peak Current Source/Sink Capability
Undervoltage Lockout for VCC Below 10 V
Internal 1.0 ms Soft−Start
Internal 8.0 ms Minimum TOFF
Adjustable Skip Level
Internal Temperature Shutdown
Direct Optocoupler Connection
SPICE Models Available for TRANsient Analysis
Pb−Free Packages are Available
Typical Applications
AC/DC Adapters for Notebooks, etc.
Offline Battery Chargers
Consumer Electronics (DVD Players, Set−Top Boxes, TVs, etc.)
Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
MARKING
DIAGRAM
1207A/P = Device Code
A
= Assembly Location
L, WL
= Wafer Lot
Y, YY
= Year
W, WW = Work Week
G
= Pb−Free Package
G= Pb−Free Package
http://onsemi.com
PDIP−8
N SUFFIX
CASE 626
1
8
SOIC−8
D1, D2 SUFFIX
CASE 751
18
5
3
4
Dmg
CS
HV
PIN CONNECTIONS
7
6
2
NC
FB
GND
Drv
VCC
1207AP
AWL
YYWWG
1
8
Device
Package
Shipping
ORDERING INFORMATION
NCP1207ADR2
SOIC−8
2500/Tape & Reel
NCP1207AP
PDIP−8
50 Units / Rail
NCP1207ADR2G
SOIC−8
(Pb−Free)
2500/Tape & Reel
†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.
NCP1207APG
PDIP−8
(Pb−Free)
50 Units / Rail
1
8
1207A
AYWW
G
1
8




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