© 2001 IXYS/DEI All rights reserved

IXDP 610

1

Description

The IXDP610 Digital Pulse Width

Modulator (DPWM) is a programmable

CMOS LSI device which accepts digital

pulse width data from a microprocessor

and generates two complementary,

non-overlapping, pulse width modula-

ted signals for direct digital control of

switching power bridge. The DPWM is

designed to be operated under the

direct control of a microprocessor and

interfaces easily with most standard

microprocessor and microcomputer

buses. The IXDP610 is packaged in an

18-Pin slim DP.

The PWM waveform generated by the

IXDP610 results from comparing the

output of the Pulse Width counter to

the number stored in the Pulse Width

Latch (see below). A programmable

"dead-time" is incorporated into the

PWM waveform. The Dead-Time Logic

disables both outputs on each

transition of the Comparator output for

the required dead-time interval.

The output stage provides complemen-

tary PWM output signals capable of

Bus Compatible Digital PWM Controller, IXDP 610

sinking and sourcing 20 mA at TTL

voltage levels. The Output Disable

logic can be activated either by

software or hardware. This facilitates

cycle-by-cycle current-limit, short-

circuit, over-temperature, and

desaturation protection schemes.

The IXDP610 is capable of operating at

PWM frequencies from zero to 390kHz;

the dead-time is programmable from

zero to 14 clock cycles (0 to 11 % of

the PWM cycle), which allows

operation with fast power MOSFETs,

IGBTs, and bipolar power transistors. A

trade-off between PWM frequency and

resolution is provided by selecting the

counter resolution to be 7-bit or 8-bit.

The 20 mA output drive makes the

IXDP610 capable of directly driving

opto isolators and Smart Power

devices. The fast response to pulse

width commands is achieved by

instantaneous change of the outputs to

correspond to the new command. This

eliminates the one-cycle delay usually

associated with other digital PWM

implementations.

Features

direct control of a switching power

bridge

width ranges from 0 to 100 %

bit resolution

390 kHz

prevents switching overlap

protect against over-current, over-

temperature, etc.

software control

to the stage in the event of a

software failure

Dimensions in inch and mm

18-Pin Slim DIP

Symbol

Definition

Maximum Ratings

V

CC

Supply voltage

-0.3 ... 5.5

V

V

IN

Input voltage

-0.3 ... V

V

V

out

Output voltage

-0.3 ... V

V

P

D

Maximum power dissipation

500

mW

T

stg

Storage temperature range

-40 ... 125

°C