IXDP610 datasheet(6/8 Pages) IXYS

6 / 8 page

IXDP 610

The Resolution bit in the Control latch

determines whether the number in the

PW latch has 7 significant bits or 8

significant bits. The following formulae

can be used to determine the resulting

PWM waveform’s duty cycle:

For 7-bit mode operation:

PW number

% duty cycle =

x 100

128

For 8-bit mode operation:

PW number

% duty cycle =

x 100

256

The formulae are valid for all PW

num-bers except those at the

Fig. 5 8088 to IXDP610 Interface

PW Number

Resulting

(binary)

Duty

7-Bit

8-Bit

Cycle

Resolution

Resolution %

0000 0000

0000 0000 0.0

0000 0001

0000 0001 0.0

0000 0010 0.78125

0000 0011 1.171875

0000 0010

0000 0100 1.5625

0000 0101 1.953125

0000 0011

0000 0110 2.34375

0000 0111 2.734375

0000 0100

0000 1000 3.125

0100 0000

1000 0000 50.0

0111

1101

1111 1010 97.65625

1111 1011 98.046875

0111

1110

1111 1100 98.4375

1111 1101 98.828125

1111 1110 99.21875

0111

1111

1111 1111 100.0

1XXX XXXX

100.0

Table 3: Duty Cycle as a Function of PW

Number

extremes. The following table

illustrates the resulting percent duty

cycle for seve-ral PW numbers. (The

complete table would have 256

entries, those entries that have been

omitted can be calcu-lated using the

above formulare.)

The PWM duty cycle byte can be

written to at any time. If the outputs

are disabled by either the Stop bit in

the Control latch or the OUTPUT

DISABLE input, writing to the PWM

duty cycle byte will have no effect on

the outputs. When the outputs are re-

enabled, the duty cycle will be deter-

mined by the last byte written to the

PWM duty cycle byte.

Application Information

Introduction

The IXDP610 is a digital PWM con-

troller intended for use with general-

purpose microprocessors and micro-

controllers. Therefore, it is important

to understand how the microproces-

sor hardware and software interacts

with and affects the operation of the

IXDP610. On the following pages one

will find discussions of some of the

most important hardware and soft-

ware interface issues. Among these

issues are the hardware interface,

how to choose the IXDP610's clock,

initialization of the DPWM, the effect

of the dead-time on the duty cycle,

and the response of the IXDP610 to

changes in the Pulse Width latch

number. The following pages should

be studied carefully by both the

hardware and the software designer.

The IXDP610 can be interfaced with

virtually any microprocessor or micro-

controller. Some interface examples

are shown below.

8051 to IXDP610 Interface

Fig. 4 is an example of how the

IXDP610 can be interfaced with an

Intel 8051 microcontroller. The

interface is very simple and is ideally

suited for servo motor control appli-

cations. The 11.059 MHz clock allows

one to use the 8051's built-in serial

communication hardware at any

standard baud rate. At this clock

frequency, the IXDP610 can be

configured for a 21.6 kHz switching

frequency and a dead-time between

zero and 1.26

µs, which is adjustable

in 180 ns steps.

8088 to IXDP610 Interface

Fig. 5 is just one example of how the

IXDP610 can be interfaced with the

Intel 8088 microprocessor. Using a

5 MHz clock (15 MHz crystal) the

IXDP610 can be configured for a

19.53 kHz switching frequency. The

deadtime can be adjusted between 0

and 2.8

µs, in 400 ns steps. This confi-

guration is ideally suited for driving DC

servo motor amplifiers that use

MOSFET, IGBT, or bipolar transistors.

Frequency and dead-time

considerations

Typical applications for the IXDP610

include full and half bridge systems.

Shown in Fig. 3 is a full bridge system.

The programmable dead-time feature

of the IXDP610 aids in preventing

shorts in the power bridge and allows

use of either fast MOSFETs or slower

IGBTs and bipolar transistors. Table 4

shows some of the PWM frequency

and dead-time combinations that can

be obtained with the IXDP610. The

various options shown in the table are

selected by varying the CLK frequency

and the Divide and 7/8 bit in the

Fig. 4 8051 to IXDP610 Interface

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