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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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Demonstration board description
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Demonstration board description
Figure 2.
L2293Q block diagram
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Table 1.
EVAL2293Q: pin description
Name
Type
VS
Power
supply
Supply voltage for the power output stages
GND
Ground
Power ground terminal
VSS
Power
supply
Supply voltage for the logic blocks. It is connected to VS through the closed jumper JP1
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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Function
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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
Operating temperature range
L2293Q thermal resistance junction-to-ambient
0 to +5 V
-20
(1)
to +125 °C
42 °C/W
1. Please refer to the L2293Q datasheet for additional details
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Demonstration board description
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EVAL2293Q demonstration board electrical schematic
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Demonstration board description
Table 3.
EVAL2293Q component list
Reference
Value
C1, C3
100 nF/50 V
Capacitor
C2
100 µF/50 V
Capacitor
R1, R2, R3, R4, R5, R6
100 Ω
U1
L2293Q
Figure 5.
Description
Resistor
Dual full bridge in VFQFPN5x5 package
EVAL2293Q component placement
MM
MM
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Figure 6.
EVAL2293Q top layer layout
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Demonstration board description
Figure 7.
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EVAL2293Q bottom layer layout
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Revision history
Revision history
Table 4.
Document revision history
Date
Revision
06-May-2010
1
Changes
Initial release.
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