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PDF L9925 Data sheet ( Hoja de datos )
| Número de pieza | L9925 | |
| Descripción | DMOS DUAL FULL BRIDGE DRIVER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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® L9925
DMOS DUAL FULL BRIDGE DRIVER
2 INDEPENDENTLY CONTROLLED
H-BRIDGES
RDS,ON <0.9Ω @ Tamb = 25°C, VS = 14V
0.8A DC CURRENT WITHOUT HEAT SINK
LOW QUIESCENT MODE Iq <200µA
THEMAL PROTECTION
CROSS CONDUCTION PROTECTION
SUPPLY VOLTAGE UP TO 40V
CMOS COMPATIBLE INPUTS
OUTPUT SHORT-CIRCUIT PROTECTION
DESCRIPTION
The L9925 is a dual full bridge driver for stepper
motor applications. Realized in BCD (Bipolar,
CMOS & DOS) techology, logic circuits, precise
linear blocks and power transistors are combined
to optimize circuit performance and minimize off
chip components. Schmitt triggers are used for all
input stages and are fully compatible with 5V
CMOS logic levels. When both enable signals are
low, the IC is commanded to a low quiescent cur-
rent state and will draw less than 200µA from the
battery.
BLOCK DIAGRAM
SO28
ORDERING NUMBER: L9925
The charge pump is integrated on chip; no exter-
nal components are required. Full performance is
maintaned for 9V <VS <16V. Extended ranges of
6V <<VS <9V and 16V <VS <40V yields full func-
tionally but with relaxed performance. Over tem-
perature protection and ESD protection to all pins
ensures relability and reduces system integration
failures.
OUT1 VS1 OUT2
IN1
7V
EN1
7V
1st FULL BRIDGE
GND
EN2
IN3
IN4
2nd FULL BRIDGE
EN1
T1 T2
T1 T2
CHARGE
PUMP
TEMP
T1
T2
5V
REGULATOR
EN1
EN2
CHARGE
PUMP
7V
EN1
IN2
PGND1
VS2
40V
OUT3
D99AT423
OUT4
March 1999
......... ....... ........ .............. ............. ........ .............. ................... ............... ....... ............. ........ .............. ............. ........ ............ .....................
1/9
1 page  
Figure 4. Application Diagram
L9925
CEN
100nF
D0
+5V
D0
D1 D2
40V
R0
10KΩ
I/O
I/O
I/O IN1
7V
CB
100nF
CB 40V
100µF
O EN1
7V
EN1
µP
1st FULL BRIDGE
T1 T2
O GND
O EN2
O IN3
O IN4
2nd FULL BRIDGE
T1 T2
CEN
100nF
R0
10KΩ
A STEPPER MOTOR
B
OUT1
VS1 OUT2
CHARGE
PUMP
TEMP
T1
T2
5V
REGULATOR
EN1
EN2
CHARGE
PUMP
7V
EN1
40V
D99AT423
IN2
PGND1
VS2
OUT3
CEX
100nF
OUT4
PGND2 CEX
100nF
Figure 4 shows a typical application diagram for
DC motor driving. To assure the safety of the cir-
cuit in the reverse battery condition a reverse pro-
tetion diode D1 is necessary. The transient pro-
tection diode D2 must assure that themaximum
supply voltage VS during the transients at the
VBAT line will be limited to a value lower than the
absolute maximu ratings for VVSP. The capacities
CB are used to lower VS-EMR and its values de-
pend on the driving load.
The resistance feedback loop realized by Ro lim-
ited to the µP power supply line by the diode Do
allows open load detection. To protect the device
at the outputs against EMI or ESD > 2KV external
capacitors Cex may be used.
CIRCUIT DESCRIPTION
L9925 is a dual full bridge IC designed to drive
DC motors, stepper motors and other inductive
loads. Eah bridge has 4 power DMOS transistor
with RDSon = 0.75Ω and the relative protection
and control circuitry (see fig. 5). Tthe 4 half
bridges can be controlled independently by
means of the 4 inputs IN1, IN3, IN4 and 2 enable
inputs ENABLE1 and ENABLE2.
LOGIC DRIVE (true table for the two full bridges)
INPUTS
IN1 IN2
IN3 IN4
OUTPUT
MOSFETS
EN1 = EN2 = H
@Tj > 150°C
EN1 = EN2 = L
L
L
H
H
X
X
L Sink 1, Sink2
H Sink1, Source2
L Source1, Sink2
H Source1, Source2
X All transistors turned OFF
X All transistors turned OFF
L = Low; H = High; X = Don’t care
CROSS CONDUCTION
The device guarantees the absence of cross-con-
duction by watching internal gate-source voltage
of the driving power DMOS.
TRANSISTOR OPERATION
ON STATE
When one of POWER DMOS transistors is ON it
can be considered as a resistor RDS(ON) = 0.75Ω
at a junction temperature of 25°C
5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet L9925.PDF ] | |
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