L9903
MOTOR BRIDGE CONTROLLER
PRODUCT PREVIEW
s
s
s
s
s
s
s
s
s
OPERATING SUPPLY VOLTAGE 8V TO 20V,
OVERVOLTAGE MAX. 40V
OPERATING SUPPLY VOLTAGE 6V WITH
IMPLEMENTED STEPUP CONVERTER
QUIESCENT CURRENT IN STANDBY MODE
LESS THAN 50碌A(chǔ)
ISO 9141 COMPATIBLE INTERFACE
CHARGE PUMP FOR DRIVING A POWER
MOS AS REVERSE BATTERY PROTECTION
PWM OPERATION FREQUENCY UP TO
30KHZ
PROGRAMMABLE CROSS CONDUCTION
PROTECTION TIME
OVERVOLTAGE, UNDERVOLTAGE, SHORT
CIRCUIT AND THERMAL PROTECTION
REAL TIME DIAGNOSTIC
SO20
ORDERING NUMBER: L9903
DESCRIPTION
Control circuit for power MOS bridge driver in auto-
motive applications with ISO 9141bus interface.
BLOCK DIAGRAM
VS
10
R CP
ST
1
-
+
=
V
STH
Ref erence
BIAS
VCC
Charge
pump
11
13
CP
CB1
GH1
f ST
12
VCC
Ov ervoltage
Undervoltage
Thermal shutdown
14
RDG
S1
DG
2
Control Logic
V S1TH
=
R S1
EN
4
REN
19
R GL1
GL1
18
R GL2
GL2
DIR
5
RDI R
V CC
R PWM
17
PWM
3
R S2
S2
V S2TH
=
PR
6
Timer
15
16
GH2
CB2
I SO-Interface
RX
7
R RX
VCC
R TX
IKH
=
0.5
鈥?/div>
V
VS
9
K
TX
8
20
GND
June 2000
This is preliminary information on a new product now in development. Details are subject to change without notice.
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