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參數(shù)資料
| 型號： | L9925 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | DMOS DUAL FULL BRIDGE DRIVER |
| 中文描述： | 偶的DMOS全橋驅(qū)動器 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 81K |
| 代理商： | L9925 |
Figure 4 shows a typical application diagram for
DC motor driving. To assure the safety of the cir-
cuit in the reverse battery conditiona reverse pro-
tetion diode D
1
is necessary. The transient pro-
tection diode D
2
must assure that themaximum
supply voltage V
S
during the transients at the
V
BAT
line will be limited to a value lower than the
absolute maximu ratings for V
VSP
. The capacities
C
B
are used to lower V
S
-EMR and its values de-
pend on thedriving load.
The resistance feedback loop realized by R
o
lim-
ited to the
μ
P power supply line by the diode D
o
allows open load detection. To protect the device
at theoutputs againstEMI or ESD > 2KV external
capacitorsC
ex
maybe 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 R
DSon
= 0.75
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 ENABLE1and ENABLE2.
LOGIC DRIVE
(truetable for the two full bridges)
INPUTS
OUTPUT
MOSFETS
IN1
IN3
IN2
IN4
EN1 = EN2 = H
L
L
H
H
L
H
L
H
Sink 1, Sink2
Sink1, Source2
Source1, Sink2
Source1, Source2
@Tj > 150
°
C
X
X
Alltransistors turned OFF
EN1 = EN2 = L
X
X
Alltransistors turned OFF
L = Low; H = High; X = Don’t care
CROSSCONDUCTION
The device guaranteesthe absenceof cross-con-
duction by watching internal gate-source voltage
of the drivingpower DMOS.
TRANSISTOR OPERATION
ON STATE
When one of POWER DMOS transistors is ON it
can be considered as a resistor R
DS(ON)
= 0.75
at a junctiontemperatureof 25
°
C
CHARGE
PUMP
TEMP
OUT1
VS1
OUT2
IN2
PGND1
VS2
OUT3
OUT4
IN1
EN1
GND
EN2
O
O
O
I/O
I/O
I/O
D
0
D
1
D
2
40V
R
0
10K
R
0
10K
C
B
100nF
C
B
40V
100
μ
F
D
0
+5V
O
O
IN3
IN4
2nd FULL BRIDGE
1st FULL BRIDGE
5V
REGULATOR
EN1
μ
P
EN1
EN1
EN2
40V
7V
7V
7V
T1
T1
T2
T2
T1 T2
CHARGE
PUMP
PGND2
D99AT423
C
EN
100nF
C
EN
100nF
C
EX
100nF
C
EX
100nF
A
B
STEPPER MOTOR
Figure 4.
ApplicationDiagram
L9925
5/9
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| L9930PD | 功能描述:馬達(dá)/運動/點火控制器和驅(qū)動器 Dual Full Bridge RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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