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LM2576T-5.0 Datasheet(PDF) 13 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM2576T-5.0
Description  SIMPLE SWITCHER 3A Step-Down Voltage Regulator
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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 13 page
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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
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