LM2576T-5.0 datasheet(13/24 Pages) NSC

Nome de Peças	LM2576T-5.0

Descrição Electrónicos	SIMPLE SWITCHER 3A Step-Down Voltage Regulator

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Fabricante Electrônico	NSC [National Semiconductor (TI)]

Página de início	http://www.national.com

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13 / 24 page

LM2576 Series Buck Regulator Design Procedure (Continued)

PROCEDURE (Adjustable Output Voltage Versions)

EXAMPLE (Adjustable Output Voltage Versions)

Given: V

OUT = Regulated Output Voltage VIN(Max) =

Maximum Input Voltage I

LOAD(Max) = Maximum Load

Current F = Switching Frequency (Fixed at 52 kHz)

Given: V

OUT = 10V VIN(Max) = 25V ILOAD(Max) = 3A F =

52 kHz

1. Programming Output Voltage (Selecting R1 and R2,

as shown in Figure 2) Use the following formula to select

the appropriate resistor values.

R

1 can be between 1k and 5k. (For best temperature

coefficient and stability with time, use 1% metal film resis-

tors)

1. Programming Output Voltage (Selecting R1 and R2)

R

2 = 1k (8.13 − 1) = 7.13k, closest 1% value is 7.15k

01147613

FIGURE 7. LM2576(HV)-ADJ

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