參數(shù)資料
型號(hào)： LM5008SD
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： High Voltage (100V) Step Down Switching Regulator
中文描述： 0.61 A SWITCHING REGULATOR, DSO8
封裝： 4 X 4 MM, LLP-8
文件頁(yè)數(shù)： 3/15頁(yè)
文件大小： 278K
代理商： LM5008SD
Pin Description
PIN
1
NAME
SW
DESCRIPTION
APPLICATION INFORMATION
Power switching node. Connect to the output
inductor, re-circulating diode, and bootstrap
capacitor.
An external capacitor is required between the BST
and the SW pins. A 0.01μF ceramic capacitor is
recommended. An internal diode charges the
capacitor from V
CC
.
A resistor between this pin and RTN sets the
off-time when current limit is detected. The off-time
is preset to 35μs if FB = 0V.
Ground for the entire circuit.
This pin is connected to the inverting input of the
internal regulation comparator. The regulation
threshold is 2.5V.
A resistor between this pin and V
IN
sets the switch
on time as a function of V
IN
. The minimum
recommended on time is 400ns at the maximum
input voltage. This pin can be used for remote
shutdown.
If an auxiliary voltage is available to raise the
voltage on this pin, above the regulation setpoint
(7V), the internal series pass regulator will
shutdown, reducing the IC power dissipation. Do not
exceed 14V. This voltage provides gate drive power
for the internal Buck switch. An internal diode is
provided between this pin and the BST pin. A local
0.1μF decoupling capacitor is recommended. Series
pass regulator is current limited to 10mA.
Recommended operating range: 9.5V to 95V.
Switching Node
2
BST
Boost Pin (Boot–strap capacitor input)
3
R
CL
Current Limit OFF time set pin
Toff = 10
-5
/ (0.285 + (FB / 6.35 x 10
6
x R
CL
))
4
5
RTN
FB
Ground pin
Feedback input from Regulated Output
6
R
ON
/SD
On time set pin
Ton = 1.25 x 10
-10
R
ON
/ V
IN
7
V
CC
Output from the internal high voltage series pass
regulator. Regulated at 7.0V.
8
V
IN
Input voltage
L
www.national.com
3
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM5008SD/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
LM5008SDC 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
LM5008SDC/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
LM5008SDCX 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
LM5008SDCX/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
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