NCP1378
PWM Current鈭扢ode
Controller for Free鈭扲unning
Quasi鈭扲esonant Operation
The NCP1378 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 transformer core reset detection is done through an auxiliary
winding which, brought via a dedicated pin, also enables fast Over
Voltage Protection (OVP). Once an OVP has been detected, the IC
permanently latches off.
The NCP1378 also features an efficient protective circuitry that, 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鈭抮ecovers. Finally an internal 1.0 ms Soft鈭扴tart
eliminates the traditional startup stress.
The NCP1378 is tailored for low voltage applications having
UVLO thresholds of 8.4 V (on) and 7.5 V (off).
Features
http://onsemi.com
MARKING
DIAGRAMS
8
8
1
SOIC鈭?
D SUFFIX
CASE 751
1
1378
ALYW
8
1
PDIP鈭?
P SUFFIX
CASE 626B
1
A
WL, L
YY, Y
WW, W
= Assembly Location
= Wafer Lot
= Year
= Work Week
1378P
AWL
YYWW
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Pb鈭扚ree Package is Available*
Free鈭扲unning Borderline/Critical Mode Quasi鈭扲esonant Operation
Latched Overvoltage Protection
Auto鈭扲ecovery Short鈭扖ircuit Protection Via UVLO Crossover
Current鈭扢ode with Adjustable Skip Cycle Capability
Internal 1.0 ms Soft鈭扴tart
Internal Temperature Shutdown
Internal Leading Edge Blanking
500 mA Peak Current Source/Sink Capability
External Latch Triggering, e.g. Via Overtemperature Signal
Direct Optocoupler Connection
SPICE Models Available for TRANsient Analysis
Internal 8.0
ms
Minimum T
OFF
PIN CONNECTIONS
Dmg 1
FB 2
CS 3
GND 4
(Top View)
6 V
CC
5 Drv
8 HV
ORDERING INFORMATION
Device
NCP1378DR2
Package
SOIC鈭?
PDIP鈭?
PDIP鈭?
(Pb鈭扚ree)
Shipping
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2500 Tape & Reel
50 Units/Tube
50 Units/Tube
Typical Applications
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Battery鈭払ased Operations
NCP1378P
NCP1378PG
*For additional information on our Pb鈭扚ree strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques Reference
Manual, SOLDERRM/D.
漏
Semiconductor Components Industries, LLC, 2004
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.
1
October, 2004 鈭?Rev. 1
Publication Order Number:
NCP1378/D
NCP1378DR2相關(guān)型號(hào)PDF文件下載
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