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參數(shù)資料
| 型號(hào)： | 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)： | 40/46頁 |
| 文件大?。?/td> | 478K |
| 代理商： | L7250 |
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L7250
40/46
4.4 Negative Voltage Regulator (CUK configuration)
Programming the Test Register Reg 0FH to ‘00101001’ it is possible to re-configurate the negative regulator
loop inverting its polarity. All the others test register (Reg0FH) configurations are resetting to the default nega-
tive voltage regulator loop polarity (take care to avoid the test register bits modification if the ‘CUK configuration’
hardware is present and the negative regulator is enabled).
The functionality of the regulator is the same descripted on the previous paragraph with the difference that the
loop polarity is reversed to permit to drive the external Nch component.
During this operation the nominal value of the triangular wave oscillator frequency is always fixed to 1 MHz.
The NVR is controlled via serial port (using the Reg. 05H -> b1 the regulator could be turned on and off).
Take care to program correctly the Test Register to enter the CUK configuration before to enable the NVR.
During the power-up and power-down phases the regulator is always off being the serial port in reset status then
the VnegEn bit equal to zero. During those phases the N_DRV output driver is in tri-state condition then an ex-
ternal pull-down to assure the Nch off condition must be considered.
Figure 18. Negative regulator (CUK configuration) - Test register => 00101001
12
N_COM P
10
N_DRV
VCC5
21
V REF25
Vbg
(typ 1.25)
11
N_FEED
R1ext
M 1ext
R2ext
Rcext
Ccext
Cfext
1Mhz
C1ext
5K
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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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