參數(shù)資料
型號: LB03
廠商: National Semiconductor Corporation
英文描述: SIMPLE SWITCHER 3A Step-Down Voltage Regulator
中文描述: 第3A的SIMPLE SWITCHER降壓穩(wěn)壓器
文件頁數(shù): 13/24頁
文件大?。?/td> 750K
代理商: LB03
LM2576 Series Buck Regulator Design Procedure
(Continued)
PROCEDURE (Adjustable Output Voltage Versions)
Given:
V
OUT
= Regulated Output Voltage V
IN
(Max) =
Maximum Input Voltage I
LOAD
(Max) = Maximum Load
Current F = Switching Frequency
(Fixed at 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.
EXAMPLE (Adjustable Output Voltage Versions)
Given:
V
OUT
= 10V V
IN
(Max) = 25V I
LOAD
(Max) = 3A F =
52 kHz
R
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
L
www.national.com
13
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