AN3094
Application note
EVAL2293Q demonstration board
Introduction
This application note describes the EVAL2293Q demonstration board for the L2293Q push-
pull 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
May 2010
Doc ID 16540 Rev 1
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www.st.com
Demonstration board description
AN3094
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Demonstration board description
Figure 2.
L2293Q block diagram
Table 1.
Name
VS
GND
VSS
GNDS
IN1
IN2
EN1
IN3
IN4
EN2
OUT1
OUT2
OUT3
OUT4
EVAL2293Q: pin description
Type
Power
supply
Ground
Power
supply
Ground
Logic input
Logic input
Logic input
Logic input
Logic input
Logic input
Output
Output
Output
Output
Function
Supply voltage for the power output stages
Power ground terminal
Supply voltage for the logic blocks. It is connected to VS through the closed jumper JP1
Signal ground terminal
Bridge 1 logic input 1
Bridge 1 logic input 2
Bridge 1 enable (active high). When LOW, switches off the output 1 and 2 power transistors
Bridge 2 logic input 1
Bridge 2 logic input 2
Bridge 2 enable (active high). When LOW, switches off the output 3 and 4 power transistors
Output 1
Output 2
Output 3
Output 4
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Doc ID 16540 Rev 1
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Figure 3.
Demonstration board description
EVAL2293Q demonstration board pin location
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
Supply voltage range (VS)
Logic supply voltage range (VSS)
RMS output current rating (OUTx)
Switching frequency
Input and enable voltage range
Operating temperature range
L2293Q thermal resistance junction-to-ambient
1. Please refer to the L2293Q datasheet for additional details
Value
VSS to 36 V
2.8
(1)
to 36 V
Up to 0.6 A
Up to 50 kHz
0 to +5 V
-20
(1)
to +125 °C
42 °C/W
Doc ID 16540 Rev 1
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Demonstration board description
Figure 4.
EVAL2293Q demonstration board electrical schematic
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Doc ID 16540 Rev 1
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Demonstration board description
Table 3.
EVAL2293Q component list
Value
100 nF/50 V
100 µF/50 V
100
Ω
L2293Q
Capacitor
Capacitor
Resistor
Dual full bridge in VFQFPN5x5 package
Description
Reference
C1, C3
C2
R1, R2, R3, R4, R5, R6
U1
Figure 5.
EVAL2293Q component placement
Figure 6.
EVAL2293Q top layer layout
Doc ID 16540 Rev 1
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