NCP4331
Synchronous Buck Controller for High Efficiency Post Regulation
The NCP4331 houses a dual MOSFET driver intende...
NCP4331
Synchronous Buck Controller for High Efficiency Post Regulation
The NCP4331 houses a dual MOSFET driver intended to be used as a companion chip in ac-dc or dc-dc multi-output post regulated power supplies. Directly fed by the secondary ac signal, the device keeps power dissipation to the lowest while reducing external component count. Further, the implementation of N-channel MOSFETs gives NCP4331-based applications a significant advantage in terms of efficiency.
Features
ăHigh Gate Drive Capability ăBootstrap for N-MOSFET High-Side Drive ăTwo Embedded Error Amplifiers Allowing Constant Current
Constant Voltage (CCCV) Operation
ă±1.5% Regulation Voltage Reference Over 0°C to 85°C Temperature
Range
ăProgrammable Soft-Start ăThermal Shutdown for Overtemperature Protection ăPWM Operation Synchronized to the Converter Frequency ăOver-Lap Management for Soft Switching ăInternal
Regulator to Ease the Circuit Feeding ăUndervoltage Detection ăThese are Pb-Free Devices
Typical Applications
ăOff-line Switch Mode Power Supplies ăPower Dc-dc Converters ăEfficient Alternative to Mag-Amp Post-
Regulators
http://onsemi.com
MARKING DIAGRAMS
16
1
SO-16 D SUFFIX CASE 751B
16
NCP4331G ALYYWW
1
16 16
NCP
1 TSSOP-16 DB SUFFIX CASE 948F
4331 ALYWG
G 1
A = Assembly Location
L = Wafer Lot
YY = Year
WW = Work Week
G or G = Pb-Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
CSout 1 CSin- 2 CSin+ 3 UVP/STDWN 4 COMP 5
FB 6 SS/Dmax 7
Cramp 8
16...