參數(shù)資料
型號(hào): MPC17550
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: Quad H-Bridge Micromotor Driver with DC/DC Boost Converter(四H橋微電機(jī)驅(qū)動(dòng)器,帶DC/DC升壓轉(zhuǎn)換器)
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(四魔橋微電機(jī)驅(qū)動(dòng)器,帶式DC / DC升壓轉(zhuǎn)換器)
文件頁數(shù): 10/16頁
文件大?。?/td> 477K
代理商: MPC17550
17550
10
Go to: www.freescale.com
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
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
A typical application schematic is shown in
Figure 4
.
Figure 4. Typical 17550 Application
2.2
μ
F
L = 1.0 mH
10
μ
F
V
DD
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
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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