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Número de pieza DG-IRMCK203
Descripción Application Developer��s Guide
Fabricantes International Rectifier 
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No Preview Available ! DG-IRMCK203 Hoja de datos, Descripción, Manual

International Rectifier 233 Kansas Street, El Segundo, CA 90245 ! USA
IRMCK203
Application Developer’s Guide
February 19, 2004
Version 1.0
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105
Data and specifications subject to change without notice. 3/18/2004

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DG-IRMCK203 pdf
IRMCK203 Application Developer’s Guide
1 Introduction
This document is provided as a supplement to the datasheet for the IRMCK203. It provides detailed information
about the internal design and external interfaces of the product and describes how to configure the operation to
conform to the requirements of a custom application. This document is intended for engineers who are developing
an application using the IRMCK203 digital control IC.
The document is divided into three main sections. In the Concepts section, system design concepts are presented and
theory of operation is described in detail. This section provides the background needed to begin IRMCK203
application development. The Techniques section provides practical “how-to” information, tips and examples to
assist with the development process. The Reference section provides a complete definition of the host register map
with a short description of each register and field. The registers are listed in sequential order for easy reference.
1.1 Constraints
The following are constraints for use of the IRMCK203 with a custom hardware system.
Analog Interface
The IRMCK203 has a built-in interface to the ADS7818 (BurrBrown) serial A/D converter (12 bit). Dc bus
voltage feedback, external speed reference and Leg Shunt current can be obtained via ADS7818 in conjunction
with MUX circuitry. An analog feedback application example is given in Section 2.4.2.
Current Feedback Interface
The IRMCK203 has a built-in interface circuit for two IR2175 motor current sensing high voltage ICs. With two
IR2175 and two shunt resistors, the motor phase currents can be obtained for motor control purposes. A 10-bit
resolution of current feedback data can be obtained. The practical power level limit for using shunt resistors is
up to 3.7 kW. For a higher horsepower application, a resistor shunt becomes impractical due to power dissipation
of shunt resistors (insert in series between motor and drive).
The IRMCK203 provides other means of current feedback through the use of an ADS7818 (BurrBrown) serial
A/D converter and Inverter Leg Shunt resistor. Inverter Leg Shunt currents can be used (reconstruction of phase
current inside IRMCK203) instead of IR2175 current feedback. However, the Leg Shunt option is recommended
only for an Inverter switching frequency less than 10KHz.
1.2 Application Connections
Figure 1 shows a typical application connection block diagram. In order to complete a Sensorless drive control, all
necessary components are shown in connection to IRMCK203. A fully self-contained drive evaluation board
(IRMCS2031) based on the IRMCK203 Digital Control IC is available for drive performance evaluation.
The figure shows a typical hardware configuration. Users can customize the design without the effort of modifying
code.
This document is the property of International Rectifier and may not be copied or distributed without expressed consent.
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DG-IRMCK203 arduino
IRMCK203 Application Developer’s Guide
Signal Name
STARTSTOP
DIR
ESTOP
FLTCLR
FAULT
SYNC
Direction Description
Input
Motor start/stop control. A positive edge transition of this signal
starts the motor and a negative edge transition stops the motor.
Input
Motor direction control. 1 = forward, 0 = reverse. This signal is
latched when the motor is started, so that changing it while the motor is
running has no effect.
Input
Emergency stop. When this signal is set to “1”, PWM is
unconditionally disabled. This signal overrides the START/STOP
control
Input
A 1 µsec pulse on this signal clears a drive fault condition. Equivalent
to setting the FltClr bit of the FaultControl register (see Section 4.2.6).
Output
This signal indicates the presence of a drive fault condition. The level
is high when any of the bits in the FaultStatus register are set (see
Section 4.3.4).
Output
This signal is held low for 2 µsec on each PWM period. (The falling
edge indicates the start of the PWM period.)
Table 5. External Interface Signal Description
NOTE: When the ExtCtrl bit in the SystemConfig register is set to “0”, the ESTOP and negative edge of the
START/STOP signals are functional, but all other external interface signals are inactive.
To configure the discrete I/O interface, write a “1” to the ExtCtrl bit in the SystemConfig host write register to enable
the external interface pins. (Refer to Section 4.2.7 for more information about the SystemConfig register.)
2.4.2 Analog I/O Interface
IRMCK203 provides analog input capability through the use of the ADS7818 A/D converter and MUX circuitry. The
intended inputs are speed reference, dc bus voltage and two Inverter Leg Shunt currents.
Analog Input
Figure 4 shows the typical hardware configuration for the analog input interface. The multiplexor input A0 (shown
on the diagram) accepts voltages in the range 0 – 5V, with two possible mappings:
2.5V = zero speed (0 digital count), 0V = max speed (16, 383 digital count)
2.5V = zero speed (0 digital count), 5V = max speed (16, 383 digital count)
The example implements the first of the two mappings (0V max speed), supplying a +15 volt analog reference for an
external variable resistor. (The DIR signal controls the motor direction, as described in Table 5.)
In this example circuit, the IRMCK203 automatically scans through A/D conversion of all four channels at the
beginning of each PWM cycle (SYNC output). The v and w phase currents followed by dc bus voltage and speed
reference are scanned in. In this example, the dc bus feedback gain is 100 times attenuation. The Leg Shunt
amplifier gain for this example is 7.97 and the A/D converter scaling is 4095 digital counts per 5V. This information
is required during drive commissioning for scaling of dc bus voltage and current feedback.
Leg Shunt feedback can be eliminated if IR2175 is intended for current feedback. The interface to the IR2175 is
straightforward and can be found in the IR2175 data sheet.
This document is the property of International Rectifier and may not be copied or distributed without expressed consent.
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