17533 데이터 시트보기 (PDF) - Freescale Semiconductor

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17533

0.7 A 6.8 V Dual H-Bridge Motor Driver

Freescale Semiconductor 

TYPICAL APPLICATIONS

INTRODUCTION

TYPICAL APPLICATIONS

INTRODUCTION

Figure 6 shows a typical application for the 17533. When

applying the gate voltage to the VG pin from an external

source, be sure to connect it via a resistor equal to, or greater

than, RG = VG / 0.02 Ω.

Care must be taken to provide sufficient gate-source

voltage for the high-side MOSFETs when VM >> VDD (e.g.,

VM = 5.0 V, VDD = 3.0 V), in order to ensure full enhancement

of the high-side MOSFET channels.

VG < 14 V

RG > VG/0.02 Ω

RG

0.01 µF

MCU

5.0 V

17533

VDD VM

OUT1A

VG

OUT1B

IN1A

IN1B

OUT2A

IN2A

IN2B

OE

OUT2B

GND

Figure 6. 17533 Typical Application Diagram

CEMF SNUBBING TECHNIQUES

Care must be taken to protect the IC from potentially

damaging CEMF spikes induced when commuting currents

in inductive loads. Typical practice is to provide snubbing of

voltage transients by placing a zener or a capacitor at the

supply pin (VM) (see Figure 7).

5.0 V 5.0 V

17533

VDD VM

5.0 V 5.0 V

17533

VDD VM

PCB LAYOUT

When designing the printed circuit board (PCB), connect

sufficient capacitance between power supply and ground

pins to ensure proper filtering from transients. For all high-

current paths, use wide copper traces and shortest possible

distances.

OUT

OUT

OUT

OUT

OUT

OUT

OUT

GND

OUT

GND

Figure 7. CEMF Snubbing Techniques

Analog Integrated Circuit Device Data

Freescale Semiconductor

17533

9

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