STMICROELECTRONICS L9907ND

L9907N
MOTOR BRIDGE FOR HEADLIGHT ADJUSTMENT
FULL BRIDGE OUTPUT CONFIGURATION
WITH LOW SATURATION VOLTAGE LESS
THAN 3.2V AT OUTPUT CURRENT 0.7A
OPERATING SUPPLY VOLTAGE RANGE 7V
TO 18V. SUPPLY OVERVOLTAGEUP TO 50V
HIGH POSITIONING PRECISION AND HIGH
NOISE IMMUNITY DUE TO TRANSFER
CHARACTERISTICS WITH NEUTRAL ZONE
AND STOP RANGE THRESHOLD
FAST STOP THROUGH SHORT-CIRCUITING
THE MOTOR
MOTOR STOP STATUS IN CASE OF OPEN
INPUT CONDITION
SUPPLY OVERVOLTAGE PROTECTION
FUNCTION FOR Vs MORE THAN 18V, UP
TO 50V
INPUT PROTECTION AGAINST TRANSIENTS ON THE BATTERY LINE AND THE
REVERSE BATTERY CONDITION
THERMAL OVERLOAD PROTECTION
ESD PROTECTED ACCORDING TO MIL883C
SO20L(12+4+4)
ORDERING NUMBER: L9907ND (SO20L)
DESCRIPTION
The L9907N is a monolithic integrated power
comparator with full bridge output configuration,
intended for driving DC motors in positioning systems, optimized for headlight adjustment application and respecting the automotive electronics environmental conditions.
BLOCK DIAGRAM
VS
PR
=
= 1.2V
REFERENCE
BIAS
RPR
INC
VINC
VS
PROTECTION
FUNCTIONS
-
IINC
OUT C
+
=
=
=
M
+
INF
VINF
OUT F
IM
IINF
=
=
1.2V
L9907N
D95AT189
December 1996
GND
1/8
L9907N
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
V SDC
DC Supply Voltage
26
VSP
Supply Voltage Pulse (T ≤ 400ms)
50
V
IOUT_DC
DC Output Current
±0.4
A
IOUT_P
Output Current Pulsed (100ms)
0.8
A
IIN
DC Input Current
±10
mA
IIN
Input Current Pulse (2ms)
±40
mA
Ts
Storage Shutdown Junction Temperature Range (*)
150
°C
(*) Recommended maximal Tamb ≤ 105°C
PIN CONNECTION
VS
1
20
N.C.
OUTC
2
19
OUTF
N.C.
3
18
N.C.
GND
4
17
GND
GND
5
16
GND
GND
6
15
GND
GND
7
14
GND
N.C.
8
13
N.C.
INC
9
12
INF
PR
10
11
N.C.
D95AT181
THERMAL DATA
Symbol
SO20L
Unit
Rth j-amb
Thermal Resistance Junction-ambient (1)
50
°C/W
Rth j-pins
Thermal Resistance Junction-pins
15
°C/W
2
Parameter
(1) with 6cm on board heat sink area
2/8
L9907N
ELECTRICAL CHARACTERISTICS (7V < VS < 18V, –40°C < Tj < 150°C; unless otherwise specified.)
Symbol
Iq
-VN-, VN+
-VST- ,VST+
VINCL
VINCH
VCH (3)
IIN
VOSI
VOSO
Parameter
Test Condition
Quiescent Current
Neutral Zone Threshold
Min.
Typ.
Max.
Unit
7
6
9
7
mA
mA
3 x VST
3 x VST
120
240
4x
VST
4 x VST
mV
mV
25
50
0.8
0.6
38
76
1.2
1.2
60
100
1.5
1.5
mV
mV
V
V
VS-2
VS-1.5
VS-1.4
V
V
V
IOUT = 0, (Output Open)
|Vdin| < 20mV (stop)
|Vdin| < 200mV (L or R)
1.5 < VINC < VS -2V; VS = 12V
R PR = ∞
R PR = 0
(2)
Stop Range Threshold
1.5 < VINC < VS -2V; VS = 12V
R PR = ∞
R PR = 0
Tj = -40 to +25ºC
Tj = >25ºC
Outputs = ON
with RINC = 0Ω
with R INC = 5KΩ
with R INC = 10KΩ
Outputs = OFF
with R INC = 0Ω
with R INC = 5KΩ
with R INC = 10KΩ
1.5 < VINC < VS -2V; VS = 12V
Vdin = 0; R PR = ∞
Vdin = ± 200mV; RPR = ∞
Vdin = 0; R PR = 0
Vdin = ± 200mV; RPR = 0
Control Input LOW Disable
Threshold
Control Input HIGH Disable
Threshold (4)
Input Bias Current
Output Saturation Voltage
Sink Stage
Output Saturation Voltage
Source Stage
IOUT
IOUT
IOUT
IOUT
VS-0.8
VS-0.6
VS-0.4
= 0.7A
= 0.35A
= 0.7A
= 0.35A
V
V
V
0.45
0.9
0.8
1.5
2.0
4.0
3.6
6.8
1.1
0.8
1.2
0.9
1.4
1.1
2
1.5
µA
µA
µA
µA
V
V
V
V
(2) With a programming resistor RPR between the PR pin and GND the N+ and N- thresholds can be adjusted from the nominal value (R PR = ∞
, pin PR open) up to two times the nominal value (RPR = 0, pin PR shorted to GND).
RPR
1+
9.5KΩ
The formula defining VN+, VN- typical value as a function of R PR and VS is: –V N− = VN+ = (36mV + 0.017⋅ VS) ⋅
.
RPR
1+2⋅
9.5KΩ
for RPR = ∞ this formula reduced to:
-VN+ (RPR = ∞) = VN+ (RPR = ∞) = 18mV + 0.0086 ⋅ VS.
for Vs in V and RPR in KΩ these formulas result in mV
(3) VCH is the control input voltage applied to the pin INC through a serial resistor RINC
(4) OUTPUTS = UNDEFINED for: VS -2V < VCH (RINC = 0Ω) < VS -0.8V
V S -1.5V < VCH (RINC = 5KΩ) < VS -0.6V
V S -1.4V < VCH (RINC = 10KΩ) < VS -0.4V
Figure 1: L9907N Differential Input to Output Transfer Characteristics
VM =VOUTC -VOUTF
MOTOR
DIRECTION LEFT
VNMOTOR
DIRECTION RIGHT
VN+
VINC -VINF
VH+
NEUTRALZONE
VH-
D95AT182
STOP RANGE
3/8
L9907N
FUNCTIONAL DESCRIPTION
The L9907N is a power comparator with fullbridge 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, VNthe output voltage is negative (corresponds to
motor direction right), for increasing differential input voltage, this status changes to the zero output
voltage (motor is actively braked), when the differential input voltage exceeds the VST- stop range
threshold. The output status remains in this condition as long as the differential input voltage remains 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 corresponding direction of the output status variation. The
active braking mode is got with both outputs in
”HIGH” status
The above described behaviour assures high positioning 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 I INC, 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 maximum value.
Figure 2: Control to feedbacktransfer characteristic
for tracking regulation (VF = VC within
the nominal VINC operating range):
D95AT183A
VBAT
VS -2V
VF
1.5V
0
VS -2V
1.5V
VBAT
VC
Figure 3: Recommended Application Circuit Diagram with L9907N for tracking regulation
(VF = VC for 1.5V < VC < VS -2V):
MODULE
D1
VBAT
IQ
D2
CS
VS
RPR
RINC
RC
RCF
VC
PR
IINC
VINF
RF
INC
VINC
RINF
OUT C
L9907N
VM
M
OUT F
IINF
IM
INF
VF
GND
D95AT184
Note:
Recommended value of RINC, RINF (equivalent input resistance to INC and INF) is 5KΩ to 10KΩ. Resistor RCF should assure that the differential
input voltage |V INC - 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.
4/8
L9907N
An external resistor RCF is recommended between the slider of the control and feedback potentiometer.
This resistor assures that in the case of input control or input feedback wire interruption the input
differential voltage will be within the NEUTRAL
ZONE and the motor position remains frozen.
The circuit features an overvoltage disable function referred to the supply voltage VS higher than
18V, both outputs are forced to tristate in this condition.
The thermal overload function disables the outputs (tristate) when the junction temperature increases above the thermal shutdown threshold
temperature of min. 150°C.
For the start of a heavy loaded motor, if the motor
current reaches the max. value it is necessary to
respect the dynamical thermal resistance junction
to ambient. The maximum output current is 0.8A.
The maximum junction temperature in this phase
should not increase above the thermal shutdown
threshold. In case of output disable due to thermal overload the output remains disabled till the
junction temperature decreases under the thermal
enable threshold. This behaviour is assured with
the thermal shutdown hysteresis threshold , which
minimum value is 20°C.
Figure 3, 5 and 7 show typical application diagrams for headlight adjustment applications. To
assure the safety of the circuits in the reverse battery condition a reverse protection diode D1, is
necessary.
The input currents in this condition are limited by
the resistors RINC and RINF. The transient protection diode D2 must assure that the maximum rating for VS during the transients at VBAT line will be
limited to a value lower than absolute maximum
Figure 4: Control to feedbacktransfer characteristic
for proportionalregulation with extended
VC operating range:
D95AT185A
VBAT
VS -2V
VF
1.5V
0
1.5V
VBAT
VS -2V
VC
Figure 5: RecommendedApplication Circuit Diagram with L9907Nfor proportionalregulation with extended
RINC2
⋅ VC:
VC operating range. For ideal adjusted condition VF =
RINC1 + RINC2
MODULE
D1
VBAT
IQ
D2
CS
VS
RPR
IINC
RINC1
RC
RINC2
VC
OUT C
PR
INC
VINC
RINF
VINF
RF
L9907N
VM
M
OUT F
IINF
IM
INF
VF
GND
D95AT186
Note:
Recommended value of RINC, RINF (equivalent input resistance to INC and INF) is 5KΩ to 10KΩ. If the motor should not change its position, when
the control signal wire become open, RINC1 and RINC2 should be rated so that VINC ≤ 0.4V in this condition.
5/8
L9907N
Figure 6: Control to feedback transfercharacteristic
for proportionalregulation with reduced
VC operating range:
D95AT187A
VBAT
VS -2V
VF
rating for VS. The device features an output disable function in case of control input voltage overdrive.
When the control input voltage increases above
the HIGH control input disable threshold VINC >
VINCH, typically VS -1.2V or decreases below the
LOW control input disable threshold VINC > VINCH,
typically 1.2V, then both outputs will be forced to
tristate.
The potential of the INC pin is clamped at the Control Input HIGH disable threshold potential with a
series resistor of 5KΩ typ. To activate the HIGH
disable comparator an input current of 35µA typ.
is needed. To respect this behaviour in the application VCR is specified for different RINC.
1.5V
0
VS -2V
1.5V
ALLOWED VC OPERATING RANGE
VBAT
VC
Figure 7: Recommended Application Circuit Diagram with L9907N for proportional regulation with reduced
RINF2
⋅ VC:
VC operating range. For ideal adjusted condition VF =
RINF2 + RINF2
MODULE
D1
VBAT
IQ
D2
CS
VS
RPR
RINC
RC
RCF
VC
PR
IINC
VINF
RF
INC
VINC
RINF1
OUT C
L9907N
VM
M
OUT F
IINF
IM
INF
RINF2
VF
GND
D95AT188
Note:
Recommended value of RINC, RINF (equivalent input resistance to INC and INF) is 5KΩ to 10KΩ. 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 fulfilled the
motor will not change its previous position.
6/8
L9907N
SO20 PACKAGE MECHANICAL DATA
mm
DIM.
MIN.
TYP.
A
a1
inch
MAX.
MIN.
TYP.
2.65
0.1
0.104
0.3
a2
MAX.
0.004
0.012
2.45
0.096
b
0.35
0.49
0.014
0.019
b1
0.23
0.32
0.009
0.013
C
0.5
0.020
c1
45° (typ.)
D
12.6
13.0
0.496
0.512
E
10
10.65
0.394
0.419
e
1.27
0.050
e3
11.43
0.450
F
7.4
7.6
0.291
0.299
L
0.5
1.27
0.020
0.050
M
S
0.75
0.030
8° (max.)
7/8
L9907N
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as criticalcomponents in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
 1996 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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