Product Overview

Product Overview
NCP1379: Controller, Quasi-Resonant, Current Mode
For complete documentation, see the data sheet
Product Description
The NCP1379 is a high performance device aimed at powering quasi-resonant converters. Capitalizing on a proprietary valley
lockout system, the controller shifts gears and reduces the switching frequency as the power loading becomes lighter. This results in
a stable operation despite switching events always triggering in the drain-source valley. This system works down to the 4th valley
and toggles to a variable frequency mode beyond, ensuring an excellent standby power performance. To improve the safety in the
overload situations, the controller includes an Over Power Protection (OPP) circuit which clamps the delivered power at high-line.
Safety-wise, a fixed internal timer relies on the feedback voltage to detect a fault. Once the timer elapses, the controller stops and
enters auto-recovery mode, ensuring a low duty-cycle burst operation. Particularly well suited for TV power supply applications, the
controller features a low startup voltage allowing use of an auxiliary supply to power the device.
Features
•
•
•
•
•
•
•
Benefits
Quasi-resonant peak current mode control operation
Valley switching operation with valley lockout
Frequency foldback at light load
Adjustable overpower protection
Auto-recovery output short circuit protection
Fixed internal 80 ms timer for short circuit protection
VCC range operation up to 28 V
• High efficiency operation
• Provides for noise-immune operation
• Improves light load efficiency
Applications
End Products
• Auxiliary power supplies (flat TV, appliances)
• Power AC-DC converters for adapters, TVs and set top
boxes
Part Electrical Specifications
Product
Compliance
Status
Topolog
y
Control
Mode
fsw Typ
(kHz)
StandUVLO
by Mode (V)
Short
Circuit
Protecti
on
Latch
Soft
Start
VCC Max Drive
(V)
Cap.
(mA)
Packag
e Type
NCP1379DR2G
Pb-free
Active
Flyback
Current
Mode
Variable
Yes
Yes
Yes
Yes
28
SOIC-8
Halide free
9
500 /
800
Application Diagram
For more information please contact your local sales support at www.onsemi.com
Created on: 6/30/2016