參數(shù)資料
型號(hào)： LM2599
廠商： National Semiconductor Corporation
英文描述： Octal Buffers/Drivers With 3-State Outputs 20-TSSOP -40 to 85
中文描述： SIMPLE SWITCHER系列電源轉(zhuǎn)換器150千赫第3A降壓穩(wěn)壓器的功能，
文件頁(yè)數(shù)： 9/31頁(yè)
文件大?。?/td> 812K
代理商： LM2599
Test Circuit and Layout Guidelines
(Continued)
As in any switching regulator, layout is very important. Rap-
idly switching currents associated with wiring inductance can
generate voltage transients which can cause problems. For
minimal inductance and ground loops, the wires indicated by
heavy lines should be wide printed circuit traces and
should be kept as short as possible.
For best results, ex-
ternal components should be located as close to the
switcher lC as possible using ground plane construction or
single point grounding.
If
open core inductors are used,
special care must be
taken as to the location and positioning of this type of induc-
tor. Allowing the inductor flux to intersect sensitive feedback,
lC groundpath and C
OUT
wiring can cause problems.
When using the adjustable version, special care must be
taken as to the location of the feedback resistors and the as-
sociated wiring. Physically locate both resistors near the IC,
and route the wiring away from the inductor, especially an
open core type of inductor. (See application section for more
information.)
Adjustable Output Voltage Versions
DS012582-25
where V
REF
= 1.23V
Select R
1
to be approximately 1 k
, use a 1% resistor for best stability.
Component Values shown are for V
IN
= 20V,
V
OUT
= 10V, I
LOAD
= 3A.
C
IN
:
— 470 μF, 35V, Aluminum Electrolytic Nichicon “PL Series”
C
OUT
:
— 220 μF, 35V Aluminum Electrolytic, Nichicon “PL Series”
D1 — 5A, 30V Schottky Rectifier, 1N5824
L1 — 68 μH, L38
R
1
— 1 k
, 1%
R
2
— 7.15k, 1%
C
FF
— 3.3 nF, See Application Information Section
R
FF
— 3 k
, See Application Information Section
Typical Values
C
SS
— 0.1 μF
C
DELAY
— 0.1 μF
R
PULL UP
— 4.7k
FIGURE 1. Standard Test Circuits and Layout Guides
L
www.national.com
9
相關(guān)PDF資料
PDF描述
LM2599S-5.0 SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features
LM2599T-12 SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features
LM2599T-3.3 SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features
LM2599T-5.0 SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features
LM2599T-ADJ SIMPLE SWITCHER Power Converter 150 kHz 3A Step-Down Voltage Regulator, with Features
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2599S-12 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2599S-12/NOPB 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2599S-3.3 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2599S-3.3/NOPB 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2599S-5.0 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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