Analog Integrated Circuit Device Data

10

Freescale Semiconductor

17529

APPLICATIONS

FUNCTIONAL PIN DESCRIPTION

APPLICATIONS

TYPICAL APPLICATION

Figure 7 shows a typical application for the 17529. When applying the gate voltage to the CRES pin 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.

Figure 7. 17529 Typical Application Diagram

CONDUCTED ELECTROMOTIVE FORCE (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 pin (VM) (see Figure 8).

Figure 8. CEMF Snubbing Techniques

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.

MCU

17529

5.0 V

GND

C1L

C1H

C2L

C2H

CRES

IN1B

IN2A

IN2B

OE

VM

VDD

OUT1B

OUT2B

0.01

μF

OUT1A

IN1A

OUT2A

NC

NC

NC

NC

V

CRES < 14 V

RG > VCRES/0.02 Ω

RG

NC = No Connect

175XX

5.0 V

5.0 V

GND

C1L

C1H

C2L

C2H

VM

VDD

OUT

OUT

175XX

5.0 V

5.0 V

GND

C1L

C1H

C2L

C2H

CRES

VM

VDD

OUT

OUT

CRES