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參數(shù)資料
| 型號： | L7250 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 5V & 12V SPINDLE AND VCM MOTORS DRIVER |
| 中文描述： | 5V的 |
| 文件頁數(shù)： | 38/46頁 |
| 文件大?。?/td> | 478K |
| 代理商： | L7250 |
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L7250
38/46
4
POWER MONITOR, VOLTAGE REGULATORS AND SHOCK SENSOR
4.1 NPOR - Power ON Reset
The Power On Reset circuit monitors 12V and 5V power supplies as well as 3.3V and 2.5V regulators. If any
monitored voltage falls below its under voltage threshold, NPOR is latched low after an internal glitch filter delay.
When the positive regulators are in position, a delay time is added, the POR delay, before NPOR goes high and
the reset condition is cleared. During this delay time, any power fault will reset the POR delay and start the
process over again.
T
Delay
= 0.520 * C
ext
Where :
C
ext
= External capacitor on pin CPOR measured in uF.
4.2 Linear Voltage Regulators:1.8V & 3.3V
The 3.3V linear use an external NPN transistor connected to the 5V power supply line, instead the 1.8V linear
regulator use an external NPN transistor that could be connected to the 3.3V line or to the 5V power supply line.
To fix the 1.8V regulator voltage output an external resistor divider as to be used.
The regulated voltage could be varied around the 1.8V value (from 1.3V to 2V) choosing the external divider
appropriately.
The stability of the two regulators is guarantee by the external filter capacitor .
The internal Vbg reference is trimmed at the wafer level.
Figure 16. Linear positive regulators
Vbg
15
16
R2
R1
33_B ase
33_Feed
V C C 5
Vbg
13
14
R 2ext
R 1ext
25_Base
25_Feed
VCC5
1.8V output
3.3V output
Cext
C ext
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| L7250E1.2 | 功能描述:電源開關(guān) IC - 配電 DSD POWER RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| L7252E2.6 | 功能描述:電源開關(guān) IC - 配電 DSD POWER RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| L725MAG | 制造商:Apex Tool Group 功能描述:TAPE, 1 IN. X 25 FT, 700 SERIES, MAGNETIC END HOOK 制造商:Lufkin 功能描述:TAPE MEASURE, MAGNETIC END HOOK 25FT 1IN; Tape Measure Type:Manual; Measuring Range Max:25ft; Blade Width:1"; Case Color:Orange; Tool Body Material:ABS; Blade Finish:Yellow Clad; Blade Length:25ft ;RoHS Compliant: NA |
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