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AN603

Solutions Cubed
Part Number AN603
Manufacturer Solutions Cubed
Description Operating ICON H-Bridges in Parallel
Published Nov 28, 2009
Detailed Description AN603: Operating ICON H-Bridges in Parallel 1 Overview: There may be instances where the 12A continuous current handl...
Datasheet PDF File AN603 PDF File

AN603
AN603

Overview
AN603: Operating ICON H-Bridges in Parallel 1 Overview: There may be instances where the 12A continuous current handling capability of the ICON HBridge is not adequate for a specific application.
For higher current applications there are at least two options that can be implemented to allow the ICON H-Bridge to meet the needs of the design.
The first option is to increase the power dissipating capability of your system.
This can most easily be accomplished by increasing the forced airflow over the ICON H-Bridge with a highspeed, high-volume, fan.
But even with increased airflow the ICON H-Bridge will probably not be capable of continuously handling more than 20A of continuous current due to the size of the ICON H-Bridge PCB.
The second option is to operate multiple ICON H-Bridges in parallel.
The N-channel MOSFETs that make up the H-bridges can efficiently share current, thus increasing the overall current handling capability of your system.
In addition, the number of control lines required to interface to each of the MOSFETs is not increased since these control lines may also be paralleled.
In this application note a single PIC16F873 (Microchip) microcontroller was used to control four ICON HBridge modules.
An analog-to-digital converter (ADC, internal to the PIC16F873) was used to establish a pulsewidth-modulation duty-cycle (PWM, also internal to the PIC16F873) to control four ICON H-Bridge modules connected in parallel.
The system was configured for unidirectional speed control and was tested at 24V with a resistive load of 0.
389Ω.
A custom PCB was designed to carry the four ICON H-Bridge modules and the control circuitry.
In testing, this design was able to deliver 48A of continuous current to the load at a 98% duty cycle (roughly 900W) for several hours.
H-Bridge Configuration: The ICON H-Bridge modules were configured to operate in “direct drive” mode for this application note.
All other settings in the ICON H-Bridges were left in their default state (as ...


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