Datasheet

LM2576, LM2576HV
SNVS107C –JUNE 1999–REVISED APRIL 2013 www.ti.com
(For Continuous Mode Operation)
Figure 27. LM2576(HV)-ADJ
PROCEDURE (Adjustable Output Voltage Versions) EXAMPLE (Adjustable Output Voltage Versions)
Given: Given:
V
OUT
= Regulated Output Voltage V
OUT
= 10V
V
IN
(Max) = Maximum Input Voltage V
IN
(Max) = 25V
I
LOAD
(Max) = Maximum Load Current I
LOAD
(Max) = 3A
F = Switching Frequency (Fixed at 52 kHz) F = 52 kHz
1. Programming Output Voltage (Selecting R1 and R2, as shown 1. Programming Output Voltage(Selecting R1 and R2)
in Figure 21 and Figure 22)
Use the following formula to select the appropriate resistor values.
R
1
can be between 1k and 5k. (For best temperature coefficient and
R
2
= 1k (8.13 − 1) = 7.13k, closest 1% value is 7.15k
stability with time, use 1% metal film resistors)
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