17531A datasheet(11/20 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

17531A

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 =

CRES/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.

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.

Figure 9. CEMF Snubbing Techniques

MCU

17531A

3.3 V

GND

C1L

C1H

C2L

C2H

CRES

IN1B

IN2A

IN2B

PSAVE

VDD

OUT1B

OUT2B

OUT1A

IN1A

OUT2A

5.0 V

RES < 14 V

RG >

RES/0.02 Ω

0.01

µF

NC = No Connect

17531A

GND

C1L

C1H

C2L

C2H

CRES

VDD

OUT

17531A

3.3 V

GND

C1L

C1H

C2L

C2H

CRES

VDD

OUT

5.0 V

3.3 V

5.0 V

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