NCP12711中文資料安森美半導(dǎo)體數(shù)據(jù)手冊(cè)PDF規(guī)格書(shū)

The NCP12711 is a fixed?frequency peak?current?mode PWM

controller containing all of the features necessary for implementing

single?ended power converter topologies. The device operates from

4 V to 45 V without auxiliary winding and within its thermal

capabilities. The controller contains a programmable oscillator

capable of operating from 100 kHz to 1 MHz and integrates slope

compensation to prevent subharmonic oscillations. The controller

includes a programmable soft?start, input voltage UVLO protection,

and an over?power protection (OPP) circuit which limits the total

power capability of the circuit as the input voltage increases. The

UVLO pin also features a shutdown comparator which allows for an

external signal to disable switching and brings the controller into a low

quiescent state. An onboard op?amp allows the implementation of

primary?side regulated converters or non?isolated dc?dc converters.

The NCP12711 contains a suite of protection features including

cycle?by?cycle peak?current limiting with smooth frequency increase

and a timer?based overload protection. All protection features place

the device into a low quiescent fault mode with a 1?s auto?recovery

period to allow for system recovery if the fault condition is removed.

Common General Features

? Wide Vcc Input Range (4 – 45 V)

? Internal 7.5?V Regulator

? Current?Mode Control with Adjustable Slope Compensation

? 0 Duty Ratio Operation in No?Load Condition

? Internal Over Power Protection

? Single Resistor Programmable Oscillator – 100 kHz to 1 MHz

? Adjustable Soft?Start on Peak Current and Frequency

? Programmable Input Voltage UVLO with Hysteresis

? Shutdown Threshold for External Disable

? Overload Protection with 30 ms Overload Timer

? Internal Operational Amplifier

? Fault Auto?recovery Mode with 1?s Auto?recovery Period

? ±1 A Source / Sink Gate Driver

Typical Applications

? Single?ended Flyback and Forward Converters for Electric Vehicles

? 4 ? 45 V Input DC/DC Controller for Auxiliary Power