LM2575HV-12 데이터 시트보기 (PDF) - Unspecified

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LM2575HV-12

Simple high-efficiency step-down (buck) regulator

Unspecified 



LM2575HV/LM2576HV/HM2676HV

GENERAL DESCRIPTION

The LM2575HV/LM2576HV/HM2676HV series of regulators

are monolithic integrated circuits that provide all the active

functions for a step-down (buck) switching regulator, capable

of driving 3A load with excellent line and load regulation. These

devices are available in fixed output voltages of 3.3V, 5V,

12V, 15V and adjustable output versions.

Requiring a minimum number of external components,

these regulators are simple to use and include internal

frequency compensation and a fixed-frequency oscillator.

The LM2575HV/LM2576HV/HM2676HV series offers a

high-efficiency replacement for popular three-terminal linear

regulators. It substantially reduces the size of the heat sink,

and in some cases no heat sink is required.

A standard series of inductors optimized for use with the

LM2575HV/LM2576HV/HM2676HV are available from

several different manufacturers. This feature greatly simplifies

the design of switch-mode power supplies.

Other features include a guaranteed  4% tolerance on

output voltage within specified input voltages and output load

conditions, and 10% on the oscillator frequency. External

shutdown is included, featuring 50A (typical) standby current.

The output switch includes cycle-by-cycle current limiting, as

well as thermal shutdown for full protection under fault

conditions.

FEATURES

 3.3V, 5V, 12V, 15V and adjustable output versions

 Adjustable version output voltage range,

1.23V to 57V  4% max over line and load

conditions

 Guaranteed 3A output current

 Wide input voltage range, 60V

 Requires only 4 external components

 52 kHz fixed frequency oscillator

 TTL shutdown capability, low power standby mode

 High efficiency

 Uses readily available standard inductors

 Thermal shutdown and current limit protection

APPLICATIONS

 Simple high-efficiency step-down (buck) regulator

 Efficient pre-regulator for linear regulators

 On-card switching regulators

 Positive to negative converter (Buck-Boost)

PIN ASSIGNMENT

TO-220, TO-263 :

ESOP-8L

(for lload ≤ 3 A)

(for lload ≤ 3 A)

1-Vin

1- Vin

2-OUTPUT

2- OUTPUT

3-GND

3-FB

4-FB

4-ON/OFF

5-ON/OFF

5, 6 ,7, 8-GND

For the best thermal performance, generous amounts of printed circuit board copper

should be used in the board layout.

TYPICAL APPLICATION (Fixed Output Voltage Versions)

55V - 60V

UNR(E6G0VULfoArTHEVD)

DDCCININPPUUTT

+VIN LM2575HV

LM2576HV

1

HM2676HV

FEEDBACK

4

OUTPUT

L1

2

+5V

REGULATED

+ CIN

3 32GH3NVD7D6KC25IHNVPO7UNT/OFF

100 H

D1

+ COUT

OUTPUT

3A LOAD

100 F 6K

1N5822

1000 F

FIGURE 1.

1

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