參數(shù)資料
型號： L9909
廠商： 意法半導(dǎo)體
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： DC MOTOR DRIVER WITH POSITION CONTROL
中文描述： 直流電動機(jī)驅(qū)動器，帶有位置控制
文件頁數(shù)： 5/9頁
文件大?。?/td> 72K
代理商： L9909
Position Feedback.
As shown in Figs. 3 and 6, a positiveerrorvoltage
VERR = VCOM - VFBK drives the motor with a
positive M+ voltage with respect to M-. A correct
negative electro-mechanical feedback is estab-
lished when the motor, supplied with a positive
M+ voltage with respect to M-, drives the feed-
back potentiometerwiper to Vcc.
Rest Zone.
When the differentialinput voltage VERR crosses
the zero Volts threshold, as detectedby the preci-
sion comparator COMP1, the motor is braked by
driving it with a zeroVolts voltage.
As long as VERR is kept inside the Rest Zone,
ranging from -VSTR to +VSTR (see Figs. 1 and
2), no electrical stimulus is applied to the motor
terminals. When in the Rest Zone M+ and M- are
both drivento Vcc.
Running Zone.
When the input error voltage VERR goes out of
the Rest Zone (see Figs. 1 and
2) the motor
starts and the wiper voltage VFB of the feedback
potentiometer moves in the direction of the input
voltage VCOM, bringing the VERR voltage back
to zero.
When VERR becomeslower than (Vcc-VSTP)/10,
a proportional control activates. The motor volt-
age at M+ and M- lowers with a rate factor of 10
times VERR. This motor voltage is generated,ac-
cording to the motor direction, by connecting to
Vcc one motor terminal and by switching the op-
posite one with a PWMcontrol.
When
approaching
the
VERR=0, the motor jumps into the Rest Zone
from a residual VSTP supply voltage. This control
target
position,
at
is suitable for motors that still run with the min.
VSTP=2.5V residual supply voltage in all condi-
tions, ensuring that the rest position is finally
reached. But at
the same
VSTP=3.5V should not make any motor run too
fast and stop faraway from the set pointfor me-
chanical inertia, or even get out of the rest zone
possibly starting oscillations.
time the
max.
TimeOut Counter.
The Time Out is performed by a 14 Bit Counter
that counts 16384 Tosc periods. When the input
error voltageVERR goes out of theRest Zone the
motor and the counter start. The motor stops at
the VERR zero crossing or when the Counter
times out, whichevercomes first.
Direction Control.
The motor can be driven in both direction and
stoppedby thetimer as shownin Fig.7.
The bias voltage at VFB input sets the threshold
voltage for the direction control input pin (DIR).
VFB and VCOM inputs may be swapped causing
the motorto reversedirections.
M
-
-
+
+
M+
M-
VFB
VCOM
U709
Vcc
GND
Vcc
V
ERR
V
OUT
I
COM
I
FB
Figure 3.
L9909 Simplified ApplicationDiagram
Vs =60V
Source resistance = 0.5
1ms < tr < 10ms
T = 400ms
t1 = 10s
Time
Vcc
Vs
10%
90%
tr
T
Figure 4.
Load Dump Transient
Vs = 100V
Source resistance = 10
tr =1
μ
s
T =200
μ
s to 500
μ
s
t1 = 200ms to 500ms
Time
Vcc
Vs
10%
90%
tr
T
t1
Figure5.
InductiveSwitching Transient - Positive
L9909
5/9
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L9911 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CAR ALTERNATOR MULTIFUNCTION SMART VOLTAGE REGULATOR
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L9911F 功能描述:低壓差穩(wěn)壓器 - LDO Car Alternator Reg Multifunction Volt RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
L9911I 功能描述:低壓差穩(wěn)壓器 - LDO Car Alternator Reg Multifunction Volt RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
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