參數(shù)資料
型號： L8229
廠商： STMICROELECTRONICS
元件分類： 運動控制電子
英文描述： STEPPER MOTOR CONTROLLER, 1.5 A, PDSO24
封裝： LEAD FREE, SSO-24
文件頁數(shù)： 32/42頁
文件大?。?/td> 858K
代理商： L8229
Obsolete
Product(s)
- Obsolete
Product(s)
DC Motor Driver operation
L8229
10
DC Motor Driver operation
When in L8229_0 or L8229_1 configuration, the device could be configured to drive two
different DC motors. Each drive provides bi-directional drive to a DC motor via the serial
control and the PWM pins. The W0 bits 8 and 14 in the register will control the direction of
drive while the PWM input pin controls the switching of the drivers. According to above
description, the motor drive will be in voltage mode only.
The device could also drive a single DC motor with increased current by paralleling the two
bridges. If this is required, W0 bit 15 must be set to 1 and OUT1A must be shorted to
OUT2A while OUT1B must be shorted to OUT2B. In this case of two bridges paralled to
drive a single DC motor, the W0 bit 14 (PHASE2) will not be used as well as pin 17 (PWM2).
This means that the device will act as a single bridge with ouputs OUTA (OUT1A in parallel
with OUT2A), OUTB (OUT1B in parallel with OUT2B) and driven by PHASE1 (W0 bit 8) and
PWM1 (pin 20).
The drives are powered by VS.
The crossover delay is controlled to provide sufficient time for cross-conduction
suppression, so that at no time both the upper and lower output devices on the same side of
the H bridge are allowed to conduct simultaneously.
A blanking period following a current turn-on event is included to prevent false current
protection turnoffs due to the initial current spike resulting from circuit capacitance.
When OCD happens, outputs are placed in Hi_Z untill next PWM positive edge occurs.
During an over-temperature event, when the device junction temperature Tj is above
Tj(shutdown), the internal thermal protection circuit disables the drive outputs by driving all
outputs to the high impedance state until the device temperatures have dropped below the
lower thermal threshold temperature.
Table 36.
DC Motor Drivers - DC Specifications
(0°C
≤ T
j ≤ 125°C, VS = 32 V, unless otherwise specified)
Name
Description
Conditions
Min
Typ
Max
Units
IDCMOTOR OCT
DC Motor Over Current Threshold
(1)
1.5
A
1.
The current limitation is applied to the bottom H bridge LDMOS only, therefore over current protection applies to motor
current, but no short circuit protection exists against shorts from the DC motor outputs to ground or to VS.
Table 37.
DC Motor Drivers - AC/Transient Specifications
(0°C
≤ T
j ≤ 125°C, VS = 32 V, unless otherwise specified)
Name
Description
Conditions
Min
Typ
Max
Units
fPWM
PWM frequency
10
30
KHz
Tblank
Blanking time (for OCD)
1
μs
Table 38.
DC Motor Drivers Truth Table
Therm.
prot.
OCD
W2 bit 15
(SLOW
/FAST)
W0 bit 8
or 14
(PHASE)
Pin 20
or 17
(PWM)
OUT A
high side
OUT Al
ow side
OUT B
high side
OUT B
low side
Out State
0
Off
On
Off
On
L-L
0
1
Off
On
Off
L-H
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