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参数资料
| 型号： | L9639 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO20 |
| 封装： | MO-166, SOP-20 |
| 文件页数： | 3/6页 |
| 文件大小： | 53K |
| 代理商： | L9639 |
Obsolete
Product(s)
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Product(s)
DESCRIPTION
This device typically drives a direct current motor
servomechanism providing two extreme end posi-
tions and replaces end position switches or sen-
sors.
For more details see the Timing diagram (Fig. 1)
and the Application diagram (Fig. 2)
When the power supply is applied, or its polarity
is inverted the motor is powered up (start point).
The current of the motor reaches the start up
value near to the stall current, always higher than
the threshold value of the device (ITH) . A delay
on the detection (TD) permits the motor start up
and the consequent decrease of the current.
During the free running phase, the current in the
motor must always be lower the threshold ITH.
When the motor reaches the end of the run limit,
the current increases reaching a value that, de-
pending on the application, can be the stall value
or can depend on some torque limiting friction
(end point). Provided that this value is higher the
programmed threshold ITH , the motor is stopped
after a time delay TD, and the device goes into a
low consumption standby status, ready to restart
the motor for a new cycle if the polarity of the
power supply is inverted (or power is switched off
and on).
In any case, if the current exceeds the higher
threshold ITHCC, the motor is immediately stopped
because a short circuit is detected. The delay TD
also permits the motor to overcome some small
obstacle during the free run.
The threshold current for the running phase ITH is
obtained by comparing the voltage on an external
sensing resistor (RSHUNT) to a threshold voltage
VTH.
1) ITH =VTH /RSHUNT
VTH is constant in respect to the power supply
voltage because in most applications, the end of
run current is depending only on motor and the
mechanic torque limiting device (friction current).
The threshold current for the short circuit detec-
tion is:
2) ITHCC =VTHCC/RSHUNT @VTHCC = 330mV @
Vbat = 12V
and depends intentionally on the supply voltage
because of the same dependence of the stall cur-
rent. The time TD depends on two external com-
ponents, capacitor CEX and resistor REX.TD is
obtained by the following expression :
TD =REX
REX KTD
KTD is a constant typically of unit value.
The block diagram is shown on the first page.
The change of the polarity between pins COM-
MON and LIVE, needs the active bridge to supply
the internal circuit. The internal supply voltage is
available between pins V+ and GND and a stor-
age and filter capacitor (100nF) must be con-
nected between these pins. The output stage
ELECTRICAL CHARACTERISTICS (Refer to the test circuit, unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Vbat
Power supply
8
17
V
Iq
Quiescent current
Stanby
100
200
A
Iref
Current ref. threshold for start
and end current (note 1)
Vbat = 8 to 17V
70
100
135
A
Irefcc
Current ref. threshold for short
circuit current det (note 2)
Vbat = 8V
Vbat = 12V
Vbat = 17V
240
300
400
300
440
550
400
560
690
A
Isc1
Current short circuit limit
8
A
Tdsc
Short circuit time delay
Iload >Ithcc
100
s
Ron
Ron output power DMOS
Iload = 1.2A
0.6
1
Ohm
Rona
Ron active bridge DMOS
Vbat = 8V, Ignd = 1A
0.7
Ohm
Rload
Open load detector max. load
resistance
200
Ohm
Ktd
Delay constant (note 3)
1
Deb
Immunity debouncer switch
Vbat = pulse
Note 1: Ith
=
R_ref
Rshunt
Iref
Note 2: Ithcc
=
R_ref
Rshunt
Irefcc
Note 3: Td
= In
Vth_high
Vth_low
Rex Cex = Rex Cex Ktd
L9639
3/6
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