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NCP1337 Datasheet(PDF) 1 Page - ON Semiconductor

Part No. NCP1337
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
July, 2006 − Rev. 2
1
Publication Order Number:
NCP1337/D
NCP1337
PWM Current−Mode
Controller for Free Running
Quasi−Resonant Operation
The NCP1337 combines a true current mode modulator and a
demagnetization detector which ensures full Borderline/Critical
Conduction Mode in any load/line conditions together with
minimum drain voltage switching (Quasi−Resonant operation). The
transformer core reset detection is done internally, without using any
external signal, due to the Soxyless concept. The frequency is
internally limited to 130 kHz, preventing the controller to operate
above the 150 kHz CISPR−22 EMI starting limit.
By monitoring the feedback pin activity, the controller enters
ripple mode as soon as the power demand falls below a
predetermined level. As each restart is softened by an internal
soft−start, and as the frequency cannot go below 25 kHz, no audible
noise can be heard.
The NCP1337 also features an efficient protective circuitry which,
in presence of an overcurrent condition, disables the output pulses
and enters a safe burst mode, trying to restart. Once the default has
gone, the device auto−recovers. Also included is a bulk voltage
monitoring function (known as brown−out protection), an adjustable
overpower compensation, and a VCC OVP. Finally, an internal 4.0 ms
soft−start eliminates the traditional startup stress.
Features
Free−Running Borderline/Critical Mode Quasi−Resonant Operation
Current−Mode
Soft Ripple Mode with Minimum Switching Frequency for Standby
Auto−Recovery Short−Circuit Protection Independent of Auxiliary
Voltage
Overvoltage Protection
Brown−Out Protection
Two Externally Triggerable Fault Comparators (one for a disable
function, and the other for a permanent latch)
Internal 4.0 ms Soft−Start
500 mA Peak Current Drive Sink Capability
130 kHz Max Frequency
Internal Leading Edge Blanking
Internal Temperature Shutdown
Direct Optocoupler Connection
Dynamic Self−Supply with Levels of 12 V (On) and 10 V (Off)
SPICE Models Available for TRANsient and AC Analysis
These are Pb−Free Devices*
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.)
PDIP−7
P SUFFIX
CASE 626B
PIN CONNECTIONS
Device
Package
Shipping†
ORDERING INFORMATION
NCP1337PG
PDIP−7
(Pb−Free)
50 Units/Tube
http://onsemi.com
MARKING
DIAGRAM
A
= Assembly Location
WL
= Wafer Lot
Y, YY
= Year
WW
= Work Week
G
= Pb−Free Package
G
= Pb−Free Package
(Top View)
FB
BO
CS
GND
DRV
HV
VCC
NCP1337P
AWL
YYWWG
1
SOIC−7
D SUFFIX
CASE 751U
NCP1337DR2G
SOIC−7
(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 Specification
Brochure, BRD8011/D.
*For additional information on our Pb−Free strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
1
2
3
4
8
6
5
P1337
AYWW
G
1
8




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