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參數(shù)資料
| 型號： | LM5007MM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Voltage (80V) Step Down Switching Regulator |
| 中文描述： | 0.9 A SWITCHING REGULATOR, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 230K |
| 代理商： | LM5007MM |
Pin Description
PIN
1
NAME
SW
DESCRIPTION
APPLICATION INFORMATION
Power switching node. Connect to the LC output
filter.
An external capacitor is required between the BST
and the SW pins. A 0.01uF ceramic capacitor is
recommended. An internal diode between Vcc and
BST completes the Buck gate drive bias network.
A resistor between this pin and RTN determines the
variation of off time, along with the FB pin voltage,
per cycle while in current limit. The off time is preset
to 17uS if FB =0V and decreases as the FB pin
voltage increases.
Switching Node
2
BST
Boost Boot–strap capacitor input
3
R
CL
Current Limit OFF time programming pin
Toff = 10
-5
/ (0.59 + (FB / 7.22 x 10
6
x R
CL
))
4
5
RTN
FB
Circuit Ground
Feedback Signal from Regulated Output
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 Vin sets the switch
on time as a function of Vin. The minimum
recommended on time is 300ns at the maximum
input voltage.
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 output provides gate drive power
for the internal Buck switch. An internal diode is
provided between this pin and the BST pin. A local
0.1uF decoupling capacitor is recommended. Series
pass regulator is current limited to 10mA.
Recommended operating range: 9V to 75V
6
R
ON
On time set pin
Ton = 1.42 x 10
-10
R
ON
/ Vin
7
Vcc
Output from the internal high voltage bias
regulator. V
CC
is nominally regulated to 7 Volts.
8
Vin
Input supply 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 |
|---|---|
| LM5007MM | 制造商:Texas Instruments 功能描述:IC BUCK SWITCHING REG 5007 MSOP8 |
| LM5007MM/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 High Vltg Step Down Switching Reg 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 |
| LM5007MM/S7003020 | 制造商:Texas Instruments 功能描述:REGULATOR-NON VMI |
| LM5007MMEP | 制造商:Texas Instruments 功能描述:STEP DOWN SWITCHING REG 80V 5007 |
| LM5007MMX | 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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