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LM2576 Datasheet(PDF) 13 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM2576
Description  SIMPLE SWITCHER 3A Step-Down Voltage Regulator
PDF  24 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2576 Datasheet(HTML) 13 Page - National Semiconductor (TI)

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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
www.national.com
13



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