LM2576 datasheet(13/23 Pages) ARTSCHIP

Part #	LM2576

Description	SIMPLE SWITCHER 3A Step-Down Voltage Regulator

PDF	23 Pages

Scroll/Zoom	100%

Manufacturer	ARTSCHIP [ARTSCHIP ELECTRONICS CO.,LMITED.]

Direct Link	http://www.artschip.com/

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13 / 23 page

LM2576/LM2576HV

www.artschip.com

LM2576 Series Buck Regulator Design Procedure (Continued)

FIGURE 7. LM2576(HV)-ADJ

PROCEDURE (Adjustable Output Voltage Versions)

EXAMPLE (Adjustable Output Voltage Versions)

Given: VOUT =Regulated Output Voltage VIN(Max)

=Maximum Input Voltage LLOAD(Max)=Maximum Load

Current F=Switching Frequency (Fixed at 52KHz)

1. Programming Output Voltage (Selecting R1 and R2,

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

the appropriate resistor values.

R1 can be between 1K and 5K. (For best temperature

coefficient and stability with time, use 1% metal film

resistors)

Given: VOUT =10V VIN(Max) =25V ILOAD(Max)=3A F=52KHz

1. Programming Output Voltage (Selecting R1 and R2)

R2 = 1K (8.13 -1) = 7.13k, closest 1% value is 7.15k

LM2576 Datasheet(PDF) 13 Page - ARTSCHIP ELECTRONICS CO.,LMITED.