NCP1207A
PWM Current鈭扢ode
Controller for Free Running
Quasi鈭扲esonant 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鈭扲esonant 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鈭抮un frequency to exceed 100 kHz (therefore below the 150 kHz
CISPR鈭?2 EMI starting limit), while the skip adjustment capability lets
the user select the frequency at which the burst foldback takes place.
The Dynamic Self鈭扴upply (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鈭抳oltage technology, the IC is
directly connected to the high鈭抳oltage DC rail. As a result, the
short鈭抍ircuit trip point is not dependent upon any V
CC
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
http://onsemi.com
MARKING
DIAGRAMS
8
SO鈭?
D1, D2 SUFFIX
CASE 751
1
8
PDIP鈭?
N SUFFIX
CASE 626
8
1
1207A/P
A
WL, L
YY, Y
WW, W
1
= Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
1207AP
AWL
YYWW
1
1207A
ALYW
8
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Free鈭扲unning Borderline/Critical Mode Quasi鈭扲esonant Operation
Current鈭扢ode with Adjustable Skip鈭扖ycle Capability
No Auxiliary Winding V
CC
Operation
Auto鈭扲ecovery 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鈭扴tart
Internal 8.0
ms
Minimum T
OFF
Adjustable Skip Level
Internal Temperature Shutdown
Direct Optocoupler Connection
SPICE Models Available for TRANsient Analysis
Pb鈭扚ree Package is Available
AC/DC Adapters for Notebooks, etc.
Offline Battery Chargers
Consumer Electronics (DVD Players, Set鈭扵op Boxes, TVs, etc.)
Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
PIN CONNECTIONS
Dmg
FB
CS
Gnd
1
2
3
4
(Top View)
8
7
6
5
HV
NC
V
CC
Drv
ORDERING INFORMATION
Device
NCP1207ADR2
NCP1207ADR2G
NCP1207AP
Package
SOIC鈭?
SOIC鈭?
(Pb鈭扚ree)
PDIP鈭?
Shipping
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2500/Tape & Reel
2500/Tape & Reel
50 Units/Tube
Typical Applications
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.
漏
Semiconductor Components Industries, LLC, 2004
1
November, 2004 鈭?Rev. 1
Publication Order Number:
NCP1207A/D
NCP1207A相關(guān)型號PDF文件下載
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