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參數(shù)資料
| 型號： | L9935 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | TWO-PHASE STEPPER MOTOR DRIVER |
| 中文描述： | 兩相步進電機驅(qū)動器 |
| 文件頁數(shù)： | 5/19頁 |
| 文件大?。?/td> | 159K |
| 代理商： | L9935 |
COMMON
LOGIC
OSCILLATOR
DIAGNOSTIC
BIASING
DRIVER
LOGIC
DRIVER
LOGIC
~
~
D99AT417
GND
20
1
GND
19
SR
A
18
R1 0.33
C1
100nF
C
1nF
C
100nF
POWER
SUPPLY
+5V
STEPPER
MOTOR
C2
10
μ
F
OUT
A2
17
N.C.
16
V
S
15
OSC
14
C
DRV
13
OUT
B2
12
SR
B
11
GND
OUT
A1
2
SCK
SDI
INTERFACE
μ
C
3
EN
8
CSN
7
VCC
6
SDO
5
SDI
4
OUT
B1
9
GND
10
R2 0.33
100nF
Figure1. GeneralApplicationCircuit Proposal.
Application hints:
C1 and C2 should be placed as close to the de-
vice as possible. Low ESR of C2 is advanta-
geous. Peak currents through C1 and C2 may
reach 2A. Care should be taken that the reso-
nance of C1, C2 togetherwith supply wire induc-
tances is not the choppingfrequencyor a multiple
of it.
FUNCTIONAL DESCRIPTION
Basic structure
The L9935 is a dual full bridge driver for inductive
Table 1.
loads with a choppercurrent regulation.
Outputs
A1 and A2
Outputs
B1 and B2
The polarity of the bridges can be controlled by
bit0 and bit3 (for full bridge A, bit3, for full bridge
B, bit0). Bit5, bit4 (for full bridge A) and bit2, bit1
(for full bridge B) control the currents. Bit3 high
leads to output A1 high. Bit0 high leads to output
B1 high.
Current setting Table 1 using a 0.33W sense re-
sistor.
belong to full bridgeA
belong to full bridgeB
bit5, bit2
H
H
L
L
bit4, bit1
H
L
H
L
I
QX
(Typ.)
0
60mA
550mA
900mA
I
RX/max
0%
Remark
61%
100%
inernally sensed
L9935
5/19
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