LM2576HVT-5.0 데이터 시트보기 (PDF) - Unspecified

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LM2576HVT-5.0

SIMPLE SWITCHER® 3A Step-Down Voltage Regulator

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LM2576 Series Buck Regulator Design Procedure (Continued)

LM2576/LM2576HV

FIGURE 7. LM2576(HV)-ADJ

PROCEDURE (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.

EXAMPLE (Adjustable Output Voltage Versions)

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

1. Programming Output Voltage (Selecting R1 and R2)

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

coefficient and stability with time, use 1% metal film

resistors)

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

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