MPC17531AEP/R2 Ver la hoja de datos (PDF) - Freescale Semiconductor

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MPC17531AEP/R2

700 mA Dual H-Bridge Motor Driver with 3.0 V Compatible Logic I/O

Freescale Semiconductor 

TYPICAL APPLICATIONS

FUNCTIONAL TERMINAL DESCRIPTION

TYPICAL APPLICATIONS

Figure 8 shows a typical application for the 17531A. When

applying the gate voltage to the CRES terminal from an

external source, be sure to connect it via a resistor equal to,

or greater than, RG = VCRES / 0.02 Ω.

The internal charge pump of this device is generated from

the VDD supply; therefore, 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 = 3.3 V), in order to

ensure full enhancement of the high-side MOSFET channels.

3.3 V 5.0 V

VCRES < 14 V

NC

NC

NC

RG > VCRES/0.02 Ω

NC

RG

0.01 µF

17531A

C1L

C1H

C2L

C2H

CRES

VDD VM

OUT1A

OUT1B

MCU

IN1A

OUT2A

IN1B

IN2A

IN2B

OUT2B

PSAVE

GND

NC = No Connect

Figure 8. 17531A Typical Application Diagram

CEMF SNUBBING TECHNIQUES

Care must be taken to protect the IC from potentially

damaging CEMF spikes induced when commutating currents

in inductive loads. Typical practice is to provide snubbing of

voltage transients via placing a capacitor or zener at the

supply terminal (VM) (see Figure 9).

PCB LAYOUT

When designing the printed circuit board (PCB), connect

sufficient capacitance between power supply and ground

terminals to ensure proper filtering from transients. For all

high-current paths, use wide copper traces and shortest

possible distances.

3.3 V 5.0 V

17531A

VDD

VM

C1L

C1H

C2L

C2H

OUT

CRES

OUT

GND

3.3 V 5.0 V

17531A

VDD

VM

C1L

C1H

C2L

C2H

OUT

CRES

OUT

GND

Figure 9. CEMF Snubbing Techniques

Analog Integrated Circuit Device Data

Freescale Semiconductor

17531A

11

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