參數(shù)資料
型號(hào)： MM908E626R2
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： Integrated Stepper Motor Driver with Embedded MCU and LIN Serial Communication
中文描述： 集成的步進(jìn)電機(jī)驅(qū)動(dòng)器，帶有嵌入式微控制器和LIN串行通信
文件頁(yè)數(shù)： 24/32頁(yè)
文件大?。?/td> 303K
代理商： MM908E626R2
908E626
24
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
Half-Bridge Current Limitation
Each low-side MOSFET offers a current limit or constant
current feature. This features is realized by a pulse width
modulation on the low-side MOSFET. The pulse width
modulation on the outputs is controlled by the FGEN input and
the load characteristics. The FGEN input provides the PWM
frequency, whereas the duty cycle is controlled by the load
characteristics.
The recommended frequency range for the FGEN and the
PWM is 0.1 kHz to 20 kHz.
Functionality
Each low-side MOSFET switches off if a current above the
selected current limit was detected. The 908E626 offers five
different current limits (refer to
Table 3
,
page 27, for current limit
values). The low-side MOSFET switches on again if a rising
edge on the FGEN input was detected (
Figure 10
).
Figure 10. Half-Bridge Current Limitation
Coil Current
Half-Bridge
Low-Side Output
FGEN Input
(MCU PWM
Signal)
Minimum 50 μs
H-Bridge low-side
MOSFET will be switched
off if select current limit is
reached.
H-Bridge low-side
MOSFET will be turned on
with each rising edge of
the FGEN input.
t (μs)
t (μs)
t (μs)
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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