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參數(shù)資料
| 型號(hào)： | MPC17550EVEL |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Quad H-Bridge Micromotor Driver with DC/DC Boost Converter |
| 中文描述： | 四H橋直流微電機(jī)驅(qū)動(dòng)器/ DC升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 212K |
| 代理商： | MPC17550EVEL |
Analog Integrated Circuit Device Data
Freescale Semiconductor
10
17550
TYPICAL APPLICATIONS
INTRODUCTION
TYPICAL APPLICATIONS
INTRODUCTION
The 17550's built-in DC DC converter must be connected
to an external inductor, rectifier, and filter capacitor. This
step-up converter generates the gate-drive voltage, V
G
,
required by the internal gate driver circuits. Although there is
some latitude in selecting the values for the external
component, care must be taken that V
G
does not exceed
14 V. Additionally, too low an inductance will cause large
instantaneous switching currents, which may damage the
device.
Important
Do not use an inductance lower than 330
μ
H.
To attain high-efficiency operation, the rectifier should be
a Schottky diode, and the filter capacitor should be of the low
Equivalent Series Resistance (ESR) type. Attention should
be paid to proper switch mode power supply PCB layout
practice. Some experimentation may be required to
determine optimal external component values. The
recommended starting values are L = 1.0 mH, C = 2.2
μ
F.
The DC DC converter includes its own internal oscillator
and does not require an external clock input.
TYPICAL APPLICATION
Two typical application schematics are shown in
Figure 6
.
and
Figure 7.
Figure 6. Typical 17550 Application - Controlling Stepper Motors
2.2
μ
F
L = 1.0 mH
10
μ
F
VDD
VM
GND
PSB
OE
INAR
INAF
INBF
INBR
INCR
INCF
INDF
INDR
VG
LX
HBAF
HBAR
HBBR
HBBF
HBCF
HBCR
HBDR
HBDF
MCU
N
S
N
S
17550
V
M
= 2.5 V
V
DD
= 3.0 V
47
μ
F
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