OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

L9903TR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
L9903
10/17
Figure 8. Charging time of an external capacitor of 10nF connected to CP pin at V
VS
=8V and
V
VS
=13.5V
Figure 9. Application Circuit Diagram
01234
time [ms]
0
5
10
15
20
25
30
voltage [V]
Charging time of a 10nF load at CP
CP for VS=13.5V
CP for VS=8V
EN
D1
µC
GND
K-Line
C1
R
R
R
R
Voltage
Regulator
V
BAT
C
S2
C
S1
R
PR
C
PR
C
B1
B2
C
V
CC
M
VS
DIR
PWM
EN
RX
TX
CP
CB1
GH1
S1
GL1
CB2
GH2
S2
GL2
K
=
PR
VCC
=
=
ISO-Interface
VCC
GND
ST
Reference
BIAS
Charge
pump
Control Logic
Overvolt age
Undervoltage
PWM
R
DIR
R
RX
R
TX
R
0.5
V
VS
R
S2
R
GL2
R
GL1
R
S1
R
CP
R
EN
VCC
Timer
I
KH
V
S2TH
Thermal shutdown
V
S1TH
DG
VCC
R
DG
V
STH
f
ST
=
-
+
10
1
2
4
5
3
6
7
8
20
9
16
15
17
18
19
14
12
13
11
11/17
L9903
3 FUNCTIONAL DESCRIPTION
3.1 General
The L9903 integrated circuit (IC) is designed to control four external N-channel MOS transistors in H-Bridge con-
figuration for DC-motor driving in automotive applications. It includes an ISO9141 compatible interface. A typical
application is shown in fig.9.
3.2 Voltage supply
The IC is supplied via an external reverse battery protection diode to the V
VS
pin. The typical operating voltage
range is down to 8V.
The supply current consumption of the IC composes of static and a dynamic part. The static current is typically
5.8mA. The dynamical current I
dyn
is depending of the PWM frequency f
PWM
and the required gate charge Q
Gate
of the external power mos transistor. The current can be estimated by the expression:
I
dyn
= 2 · f
PWM
· Q
Gate
An external power transistor with a gate charge of Q
Gate
= 160nC and a PWM frequency of f
PWM
= 20kHz re-
quires a dynamical supply current of I
dyn
= 6.4mA.
The total supply current consumption is I
VS
= 5.8mA + 6.4mA = 12.2mA.
3.3 Extended supply voltage range (ST)
The operating battery voltage range can be extended down to 6V using the additional components shown in
fig.7. A small inductor of L~150µH (I
peak
~500mA) in series to the battery supply builts up a step up converter
with the switching open drain output ST. The switching frequency is typical 100kHz with a fixed duty cycle of
50%. The step up converter starts below V
VS
< 8V, increases the supply voltage at the V
S
pin and switches off
at V
VS
> 10V to avoid EME at nominal battery voltage. The diode D2 in series with the ST pin is necessary only
for systems with negative battery voltage. No additional load can be driven by the step up converter.
Figure 10.
V
BAT
L1 D1
D2
C1 C2
VS
ST
V
STH
f
ST
=
-
+
L9903
L9903
12/17
3.4 Control inputs (EN, DIR, PWM)
The cmos level inputs drive the device as shown in fig.7 and described in the truth table.
The device is activated with enable input HIGH signal. For enable input floating (not connected) or VEN=0V the
device is in standby mode. When activating the device a wake-up time of 50µs is recommended to stabilize the
internal supplies.
The DIR and PWM inputs control the driver of the external H-Bridge transistors. The motor direction can be
choosen with the DIR input, the duty cycle and frequency with the PWM input. Unconnected inputs are defined
by internal pull up resistors. During wake-up and braking and before disactivating the IC via enable both inputs
should be driven HIGH.
Table 6.
Truth table:
Symbols: x Don't care R:Resistive output TS:Thermal shutdown
0: Logic LOW or not active L: Output in sink condition OV:Overvoltage
1: Logic HIGH or active H: Output in source condition UV:Undervoltage
T: Tristate SC:Short Circuit
6. Only those external MOS transistors of the H-Bridge which are in short circuit condition are switched off. All others remain driven
by DIR and PWM.
7. See Application Note AN2229
3.5 Thermal shutdown
When the junction temperature exceeds T
JSD
all driver are switched in sink condition (L), the K- output is off and
the diagnostic DG is LOW until the junction temperature drops below T
JSD
- T
JHYST
.
3.6 Overvoltage Shutdown
When the supply voltage V
VS
exceeds the overvoltage threshold V
VSOVH
all driver are switched in sink condition
(L), the K- output is off and the diagnostic DG is LOW.
3.7 Undervoltage Shutdown
For supply voltages below the undervoltage disable threshold the gate driver remains in sink condition (L) and
the diagnostic DG is low.
Status Control inputs Device status
Driver stage for external
power MOS
Diagnostic Comment
EN DIR
PWM
TS OV UV SC GH1 GL1 GH2 GL2 DG
1 0xxxxxx
R
7)
R
R
7)
R T standby mode
2 1xx1000LLLL L thermal
shutdown
3 1xx0100LLLL L overvoltage
4 1xx0010LLLL L undervoltage
5 1xx0001
X
6)
X
6)
X
6)
X
6
L
short circuit
6)
6 1000000LHHL H
7 1x10000HLHL H braking mode
8 1100000HLLH H
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

L9903TR

Mfr. #:
Buy L9903TR
Manufacturer:
STMicroelectronics
Description:
Motor / Motion / Ignition Controllers & Drivers Motor Bridge
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet