ST AN3094 APPLICATION NOTE

AN3094

Application note

EVAL2293Q demonstration board

Introduction

This application note describes the EVAL2293Q demonstration board for the L2293Q pushpull four channel driver with integrated diodes. The L2293Q is designed to drive inductive loads such as DC and stepping motors, or relays and solenoids. The board implements a typical application which can be used as a reference design to drive two-phase bipolar stepper motors with currents up to 0.6 A DC, multiple DC motors and a wide range of inductive loads.

Housed in a QFN 5 x 5 mm 32-lead package, the small footprint of the L2293Q makes the PCB very compact (24.5 x 24.5 mm).

Figure 1. EVAL2293Q demonstration board

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May 2010

Doc ID 16540 Rev 1

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Demonstration board description	AN3094

1 Demonstration board description

Figure 2. L2293Q block diagram

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Table 1.		EVAL2293Q: pin description
Name		Type	Function
VS		Power	Supply voltage for the power output stages
		supply
GND		Ground	Power ground terminal
VSS		Power	Supply voltage for the logic blocks. It is connected to VS through the closed jumper JP1
		supply
GNDS		Ground	Signal ground terminal
IN1		Logic input	Bridge 1 logic input 1
IN2		Logic input	Bridge 1 logic input 2
EN1		Logic input	Bridge 1 enable (active high). When LOW, switches off the output 1 and 2 power transistors
IN3		Logic input	Bridge 2 logic input 1
IN4		Logic input	Bridge 2 logic input 2
EN2		Logic input	Bridge 2 enable (active high). When LOW, switches off the output 3 and 4 power transistors
OUT1		Output	Output 1
OUT2		Output	Output 2
OUT3		Output	Output 3
OUT4		Output	Output 4

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AN3094					Demonstration board description
	Figure 3.	EVAL2293Q demonstration board pin location
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The logic and power voltage supply pins are connected through jumper JP1 (normally closed). If VS and VSS need to be supplied with different voltage values, JP1 should be opened and the supply to each should be provided separately through external terminals.

The INx input pins drive the corresponding half-bridge. When a low logic level is applied, the low side power switch is turned on, whereas a high logic level turns on the high side switch.

Pins EN1 and EN2 are used to disable the bridges and put the output pins in a high impedance status. The output stages integrate freewheeling diodes.

Table 2 below summarizes the electrical specifications of the application, Figure 3 shows the electrical schematic and Table 3 provides the component list.

Table 2.	EVAL2293Q: electrical specification (recommended values)
	Parameter		Value
	Supply voltage range (VS)		VSS to 36 V
Logic supply voltage range (VSS)			2.8 (1) to 36 V
RMS output current rating (OUTx)			Up to 0.6 A
	Switching frequency		Up to 50 kHz
	Input and enable voltage range		0 to +5 V
	Operating temperature range		-20 (1) to +125 °C
L2293Q thermal resistance junction-to-ambient			42 °C/W
1. Please refer to the L2293Q datasheet for additional details

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