收藏本站
参数资料
型号： LM2596-ADJMWC
厂商： NATIONAL SEMICONDUCTOR CORP
元件分类： 稳压器
英文描述： 7.5 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC
封装： WAFER
文件页数： 5/36页
文件大小： 827K
代理商： LM2596-ADJMWC
LM2596 Series Buck Regulator Design Procedure (Adjustable Output)
PROCEDURE (Adjustable Output Voltage Version)
EXAMPLE (Adjustable Output Voltage Version)
Given:
V
OUT = Regulated Output Voltage
V
IN(max) = Maximum Input Voltage
I
LOAD(max) = Maximum Load Current
F = Switching Frequency
(Fixed at a nominal 150 kHz).
Given:
V
OUT = 20V
V
IN(max) = 28V
I
LOAD(max) = 3A
F = Switching Frequency
(Fixed at a nominal 150 kHz).
1. Programming Output Voltage (Selecting R
1 and R2,as
shown in
Figure 1 )
Use the following formula to select the appropriate resistor
values.
Select a value for R
1 between 240 and 1.5 k. The lower
resistor values minimize noise pickup in the sensitive feed-
back pin. (For the lowest temperature coefficient and the best
stability with time, use 1% metal film resistors.)
1. Programming Output Voltage (Selecting R
1 and R2,as
shown in
Figure 1 )
Select R
1 to be 1 k, 1%. Solve for R2.
R
2 = 1k (16.26 1) = 15.26k, closest 1% value is 15.4 k.
R
2 = 15.4 k.
2. Inductor Selection (L1)
A. Calculate the inductor Volt
microsecond constant E T(V
s), from the following formula:
where V
SAT = internal switch saturation voltage = 1.16V
and V
D = diode forward voltage drop = 0.5V
B. Use the E
T value from the previous formula and match it
with the E
T number on the vertical axis of the Inductor Value
Selection Guide shown in
Figure 7.
C. on the horizontal axis, select the maximum load current.
D. Identify the inductance region intersected by the E
T value
and the Maximum Load Current value. Each region is identi-
fied by an inductance value and an inductor code (LXX).
E. Select an appropriate inductor from the four manufacturer’s
part numbers listed in
Figure 8.
2. Inductor Selection (L1)
A. Calculate the inductor Volt
microsecond constant
(E
T),
B. E
T = 34.2 (V s)
C. I
LOAD(max) = 3A
D. From the inductor value selection guide shown in
Figure 7,
the inductance region intersected by the 34 (V
s) horizontal
line and the 3A vertical line is 47 H, and the inductor code is
L39.
E. From the table in
Figure 8, locate line L39, and select an
inductor part number from the list of manufacturers part num-
bers.
LM2596
www.national.com
13
相关PDF资料
PDF描述
LM2596-ADJMDC 7.5 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC
LM2601MDC 1-CHANNEL POWER SUPPLY SUPPORT CKT, UUC
LM2601MWC 1-CHANNEL POWER SUPPLY SUPPORT CKT, UUC
LM2636MTC/NOPB SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO20
LM2636M/NOPB SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO20
相关代理商/技术参数
参数描述
LM2596ADPBCKGEVB 功能描述:BOARD EVAL LM2596ADJ BUCK D2PAK RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969
LM2596ATPBCKGEVB 功能描述:BOARD EVAL LM2596ADJ BUCK TO-220 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969
LM2596DSADJG 功能描述:直流/直流开关调节器 3A BUCK SWCH 150KHZ RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
LM2596DSADJR4G 功能描述:直流/直流开关调节器 3A BUCK SWCH 150KHZ RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5
LM2596S 制造商:Texas Instruments 功能描述:
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*