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參數(shù)資料
| 型號： | L296PHT |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | HIGH CURRENT SWITCHINGREGULATORS |
| 中文描述： | 大電流SWITCHINGREGULATORS |
| 文件頁數(shù)： | 19/22頁 |
| 文件大?。?/td> | 285K |
| 代理商： | L296PHT |
Figure43 :
5.1V/2APowerSupplyusing External
LimitingCurrent Resistorand Crow-
barProtectionon theSupplyVoltage
(L296Ponly)
SOFT-START AND REPETITIVE POWER-ON
Whenthedeviceisrepetitivelypowered-on,thesoft-
start capacitor, C
SS
, must be dischargedrapidly to
ensurethateachstartis”soft”.Thiscanbeachieved
economicallyusingtheresetcircuit,asshowninFig-
ure44.
InthiscircuitthedividerR1,R2 connectedto pin12
determines the minimum supply voltage, below
whichthe opencollectortransistorat thepin14out-
put dischargesC
SS
.
Figure44
Figure45
Figure46
Theapproximatedischargetimesobtainedwiththis
circuitare :
CSS (
μ
F)
2.2
4.7
10
tDIS (
μ
s)
200
300
600
Ifthesetimesarestilltoolong,anexternalPNPtran-
sistor may be added, as shown in Figure 45 ; with
this circuit discharge times of a few microseconds
maybe obtained.
HOW TO OBTAIN BOTH RESET AND
POWER FAIL
Figure46illustrateshowitispossibleto obtainat the
same time both the power fail and reset functions
simplybyaddingonediode(D)andoneresistor(R).
In this case the Reset delay time (pin 13) can only
startwhen theoutputvoltageis V
O
≥
V
REF
- 100mV
andthe voltageaccrossR2 is higherthan4.5V.
Withthehysteresisresistoritispossibletofixthein-
put pin 12 hysteresisin order to increaseimmunity
to the 100Hzripple presenton the supplyvoltage.
Moreover, the power fail and reset delay time are
automaticallylocked tothesoft-start.Soft-startand
delayedreset arethus two sequentialfunctions.
The hysteresis resistor should be In the range of
aboit100k
andthe pull-up resistor of 1to 2.2k
.
L296 - L296P
19/22
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L296 | HIGH CURRENT SWITCHINGREGULATORS |
| L296P | HIGH CURRENT SWITCHINGREGULATORS |
| L296HT | HIGH CURRENT SWITCHINGREGULATORS |
| L298HN | DUAL FULL-BRIDGE DRIVER |
| L298 | DUAL FULL-BRIDGE DRIVER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L297 | 制造商:Panasonic Industrial Company 功能描述:INTEGRATED CIRC |
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| L297/1 | 制造商:STMicroelectronics 功能描述:IC STEPPER MOTOR CONTROLLER |
| L2971 | 制造商:STMicroelectronics 功能描述:Stepper motor controller,L297/1 DIP20 |
| L297A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Stepper Motor Controller/Driver |
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