L9935(1999) Ver la hoja de datos (PDF) - STMicroelectronics
Número de pieza
componentes Descripción
Fabricante
L9935 Datasheet PDF : 19 Pages
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Figure 1. General Application Circuit Proposal.
L9935
GND 1
OUTA1 2
SDI
INTERFACE
µC
SCK 3
SDI 4
SDO 5
CSN 7
EN 8
+5V VCC 6
100nF
OUTB1 9
GND 10
~
DRIVER
LOGIC
COMMON
LOGIC
OSCILLATOR
DIAGNOSTIC
BIASING
DRIVER
LOGIC
~
20 GND
19 SRA
R1 0.33Ω
18 OUTA2
17 N.C.
16
VS
15 OSC
COSC
1nF
CDriver
14
100nF
CDRV
C1
100nF
STEPPER
MOTOR
POWER
SUPPLY
C2
10µF
13 OUTB2
12 SRB
R2 0.33Ω
11 GND
D99AT417
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 together with supply wire induc-
tances is not the chopping frequency or a multiple
of it.
FUNCTIONAL DESCRIPTION
Basic structure
The L9935 is a dual full bridge driver for inductive
Table 1.
loads with a chopper current regulation.
Outputs A1 and A2 belong to full bridge A
Outputs B1 and B2 belong to full bridge B
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.
bit5, bit2
H
H
L
L
bit4, bit1
H
L
H
L
IQX (Typ.)
0
60mA
550mA
900mA
IRX/max
0%
61%
100%
Remark
inernally sensed
5/19
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