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NCP1337_15 Datasheet, PDF (1/15 Pages) ON Semiconductor – PWM Current-Mode Controller | |||
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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 (QuasiâResonant 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 CISPRâ22 EMI starting limit.
By monitoring the feedback pin activity, the controller enters skip
mode as soon as the power demand falls below a predetermined
level. As each restart is softened by an internal SoftâSkipt, 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 autoârecovers. Also included is a bulk voltage
monitoring function (known as brownâout protection), an adjustable
overpower compensation, and a VCC OVP. The controller
immediately restarts after any of these conditions, unless the fault
timer has timed out. Finally, an internal 4.0 ms softâstart eliminates
the traditional startup stress.
Features
⢠FreeâRunning Borderline/Critical Mode QuasiâResonant Operation
⢠CurrentâMode
⢠SoftâSkip Mode with Minimum Switching Frequency for Standby
⢠AutoâRecovery ShortâCircuit Protection Independent of Auxiliary
Voltage
⢠Overvoltage Protection
⢠BrownâOut Protection
⢠Two Externally Triggerable Fault Comparators (one for a disable
function, and the other for a permanent latch)
⢠Internal 4.0 ms SoftâStart
⢠500 mA Peak Current Drive Sink Capability
⢠130 kHz Max Frequency
⢠Internal Leading Edge Blanking
⢠Internal Temperature Shutdown
⢠Direct Optocoupler Connection
⢠Dynamic SelfâSupply with Levels of 12 V (On) and 10 V (Off)
⢠SPICE Models Available for TRANsient and AC Analysis
⢠These are PbâFree Devices
Typical Applications
⢠ACâDC Adapters for Notebooks, etc.
⢠Offline Battery Chargers
⢠Consumer Electronics (DVD Players, SetâTop Boxes, TVs, etc.)
⢠Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
www.onsemi.com
PDIPâ7
P SUFFIX
CASE 626B
MARKING
DIAGRAM
7
NCP1337P
AWL
YYWWG
1
SOICâ7
D SUFFIX
CASE 751U
8
P1337
ALYW G
G
1
A
= Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
G, G = PbâFree Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
1
BO
2
FB
3
CS
4
GND
8
HV
6
VCC
5
DRV
(Top View)
ORDERING INFORMATION
Device
Package
Shippingâ
NCP1337PG
PDIPâ7
(PbâFree)
50 Units/Rail
NCP1337DR2G
SOICâ7 2500 Tape & Reel
(PbâFree)
â 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.
© Semiconductor Components Industries, LLC, 2014
1
December, 2014 â Rev. 6
Publication Order Number:
NCP1337/D
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