参数资料
型号: MM908E626AVEK
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: FLASH, 32 MHz, MICROCONTROLLER, PDSO54
封装: 5.10 X 10.30 MM, 0.65 MM PITCH, LEAD FREE, SOIC-54
文件页数: 19/43页
文件大小: 842K
代理商: MM908E626AVEK
Analog Integrated Circuit Device Data
26
Freescale Semiconductor
908E626
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
HBx_H—High Side On/Off Bits
These read/write bits turn on the high side MOSFETs.
Reset clears the HBx_H bits.
1 = High side MOSFET turned on for half-bridge output
x.
0 = High side MOSFET turned on for half-bridge output
x.
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 , for current limit
values). The low side MOSFET switches on again if a rising
edge on the FGEN input was detected (Figure 13).
Figure 13. Half-bridge Current Limitation
Coil Current
Half-bridge
Low Side Output
FGEN Input
(MCU PWM
Signal)
Minimum 50 s
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 (s)
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