NCP1337 Datasheet, PDF (1/14 Pages) ON Semiconductor – PWM Current−Mode Controller for Free Running Quasi−Resonant Operation

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 V_CC 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.)
http://onsemi.com
MARKING
DIAGRAM
PDIP−7
P SUFFIX
CASE 626B
NCP1337P
AWL
YYWWG
1
SOIC−7
D SUFFIX
CASE 751U
8
P1337
AYWW
G
1
A
WL
Y, YY
WW
G
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
= Pb−Free Package
PIN CONNECTIONS
1
BO
2
FB
3
CS
4
GND
8
HV
6
VCC
5
DRV
(Top View)
ORDERING INFORMATION
Device
Package
Shipping†
NCP1337PG
PDIP−7
(Pb−Free)
50 Units/Tube
NCP1337DR2G
SOIC−7 2500 Tape & Reel
(Pb−Free)
†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.
© Semiconductor Components Industries, LLC, 2006
1
July, 2006 − Rev. 2
Publication Order Number:
NCP1337/D