MPC17529(2004) 데이터 시트보기 (PDF) - Freescale Semiconductor

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MPC17529
(Rev.:2004)

0.7 A Dual H-Bridge Motor Driver with 3.0V/5.0V Compatible Logic I/O

Freescale Semiconductor 

Freescale Semiconductor, Inc.

APPLICATIONS

Typical Application

Figure 5 shows a typical application for the 17529. 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 = 3.0 V), in order to ensure

full enhancement of the high-side MOSFET channels.

VCRES < 14 V

NC

NC

NC

RG > VCRES/0.02 Ω NC

RG

0.01 µF

MCU

5.0 V

17529

C1L

C1H

C2L

C2H

CRES

VDD VM

OUT1A

OUT1B

IN1A

OUT2A

IN1B

IN2A

IN2B

OUT2B

OE GND

NC = No Connect

Figure 5. 17529 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 by placing a capacitor or zener at the supply

terminal (VM) (see Figure 6).

5.0 V

5.0 V

175XX

VDD

VM

C1L

C1H

C2L

C2H

OUT

CRES

OUT

GND

5.0 V 5.0 V

175XX

VDD

VM

C1L

C1H

C2L

C2H

OUT

CRES

OUT

GND

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.

Figure 6. CEMF Snubbing Techniques

MOTOROLA ANALOG INTEGRATED CIRFCoUrITMDEoVrIeCEIDnAfoTArmation On This Product,

Go to: www.freescale.com

17529

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