Datasheet Texas Instruments LM3578AN/NOPB — 数据表

LM2578A, LM3578A
www.ti.com SNVS767E – AUGUST 2000 – REVISED APRIL 2013 LM2578A/LM3578A Switching Regulator
Check for Samples: LM2578A, LM3578A FEATURES DESCRIPTION The LM2578A is a switching regulator which can
easily be set up for such DC-to-DC voltage
conversion circuits as the buck, boost, and inverting
configurations. The LM2578A features a unique
comparator input stage which not only has separate
pins for both the inverting and non-inverting inputs,
but also provides an internal 1.0V reference to each
input, thereby simplifying circuit design and p.c. board
layout. The output can switch up to 750 mA and has
output pins for its collector and emitter to promote
design flexibility. An external current limit terminal
may be referenced to either the ground or the Vin
terminal, depending upon the application. In addition,
the LM2578A has an on board oscillator, which sets
the switching frequency with a single external
capacitor from 100 MО©
*LM2578 max duty cycle is 90% Definition of Terms
Input Reference Voltage: The voltage (referred to ground) that must be applied to either the inverting or noninverting input to cause the regulator switch to change state (ON or OFF).
Input Reference Current: The current that must be drawn from either the inverting or non-inverting input to
cause the regulator switch to change state (ON or OFF). Copyright © 2000–2013, Texas Instruments Incorporated Product Folder Links: LM2578A LM3578A Submit Documentation Feedback 7 LM2578A, LM3578A
SNVS767E – AUGUST 2000 – REVISED APRIL 2013 www.ti.com Input Level Shift Accuracy: This specification determines the output voltage tolerance of a regulator whose …