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参数资料
| 型号： | L9907ND |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, 0.8 A, PDSO20 |
| 封装： | SO-20 |
| 文件页数： | 4/8页 |
| 文件大小： | 159K |
| 代理商： | L9907ND |
FUNCTIONAL DESCRIPTION
The L9907N is a power comparator with full-
bridge push-pull outputs, intended for driving a
DC motor in the headling adjustment system.
The basic function of the device is shown in the
input-output tranfer characteristic, Fig. 1.
For differential input voltage (VINC - VINF) lower
than the negative NEUTRAL ZONE threshold, VN-
the output voltage is negative (corresponds to
motor direction right), for increasing differential in-
put voltage, this status changes to the zero output
voltage (motor is actively braked), when the differ-
ential input voltage exceeds the VST- stop range
threshold. The output status remains in this condi-
tion as long as the differential input voltage re-
mains within the NEUTRAL ZONE. If the input
voltage increases above the positive NEUTRAL
ZONE threshold VN+, the output voltage become
positive (motor direction left).
Similar behaviour is obtained for decreasing the
input voltage. The output status transitions are
marked with the arrows showing the correspond-
ing direction of the output status variation. The
active braking mode is got with both outputs in
"HIGH" status
The above described behaviour assures high po-
sitioning precision, corresponding to the STOP
RANGE and high noise immunity in the adjusted
condition due to the NEUTRAL ZONE hysteresis
thresholds .
Both the above described thresholds are defined
referring to INC, INF pins. The error due to voltage
drop over the input signal source resistances
RINC, RINF is minimized with extremely low input
bias currents IINC, IINF.
The above mentioned resistors (RINC, RINF) are
necessary for the input current limitation during
the transients on the VBAT line. The input source
resistors must be dimensioned so that in case of
a line transient the input current in the input pin,
clamped with the internal input protection diodes
do not increase over the specified absolute maxi-
mum value.
VBAT
VS -2V
1.5V
VF
0
1.5V
VS -2V
VBAT
VC
D95AT183A
Figure 2: Control to feedback transfer characteristic
for tracking regulation (VF = VC within
the nominal VINC operating range):
D1
D2
CS
IQ
RC
VINC
RINF
RINC
RPR
RCF
PR
L9907N
IINC
INC
VINF
IINF
INF
VS
RF
VC
VF
GND
OUT C
OUT F
M
VM
IM
VBAT
D95AT184
MODULE
Figure 3: Recommended Application Circuit Diagram with L9907N for tracking regulation
(VF = VC for 1.5V < VC < VS -2V):
Note:
Recommended value of RINC, RINF (equivalent input resistance to INC and INF) is 5K
to 10K. Resistor RCF should assure that the differential
input voltage |VINC - VINF| remains within the NEUTRAL ZONE, when the control signal wire become broken. When this condition is fulfiled the
motor will not change its previous position.
L9907N
4/8
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