17550 데이터 시트보기 (PDF) - Motorola => Freescale

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17550

Quad H-Bridge Micromotor Driver with DC/DC Boost Converter

Motorola => Freescale 

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, VG, 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 VG 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 µH.

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 µF.

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.

47 µF

VM = 2.5 V VDD = 3.0 V

17550

VM

VDD

10 µF

LX

OE

PSB

VG

L = 1.0 mH

2.2 µF

MCU

INAF

INAR

HBAF

HBAR

INBF

INBR

HBBF

HBBR

INCF

INCR

HBCF

HBCR

INDF HBDF

INDR HBDR

GND

N

S

N

S

Figure 4. Typical 17550 Application

17550

10

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

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