Product Overview

Product Overview
NCP1340: High-Voltage, Quasi-Resonant Controller Featuring Valley LockOut Switching
For complete documentation, see the data sheet
Product Description
The NCP1340 is a highly integrated quasi-resonant flyback controller suitable for designing high-performance off-line power
converters. With an integrated active X2 capacitor discharge feature, the NCP1340 can enable no-load power consumption below 30
mW. The quasi-resonant current-mode flyback stage features a proprietary valley-lockout circuitry, ensuring stable valley switching.
This system works down to the 6th valley and transitions to a frequency foldback mode to reduce switching losses. As the load
decreases further, the NCP1340 enters quiet-skip mode to manage the power delivery. To help ensure converter ruggedness, the
NCP1340 implements several key protective features such as internal brownout detection, a non-dissipative Over Power Protection
(OPP) for constant maximum output power regardless of input voltage, a latched over voltage and NTC-ready over temperature
protection through a dedicated pin, and line removal detection to safely discharge the X2 capacitors when the line is removed.
Features
Benefits
• QR Frequency Jittering
• New Quiet-Skip™ Technology
• Integrated HV Startup with Brownout Protection
• Reduces EMI Signature
• Ensures Operation Outside Audible Range
• Provides an efficient power-on source and protects agaisnts
drops in input mains voltage
• Maximizing the efficiency over the entire power range
• Eliminates the need for a X2 resistors
• Extra protection against high temperature or other fault
conditions
• Enables faster switching of primary-side MOSFET
• Simple implementation of required protection functions
• Valley Switching Operation with Valley Lockout
• Integrated X2 Capacitor Discharge Capability
• NTC Compatible Fault Pin
• High Drive Capability: -500 mA / +800 mA
• Latch input for OVP and OTP implementations
Applications
End Products
• Medium or High Power AC-DC Adapters
• Ultra High Density AC-DC Adapters
•
•
•
•
Notebook Adpaters
Flat TV SMPS
Computer Power Supplies
Phone and Tablet Adapters
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
NCP1340B1DR2G
Pb-free
ProductPre
view
Flyback
Current
Mode
Variable
Yes
9
Yes
Yes
Yes
30
500 /
800
SOIC-8
ProductPre
view
Flyback
Current
Mode
Variable
Yes
9
Yes
Yes
Yes
30
500 /
800
SOIC9
NB
Halide free
NCP1340B3D1R2G
Pb-free
Halide free
For more information please contact your local sales support at www.onsemi.com
Created on: 6/30/2016