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 !-V May 2010 Doc ID 16540 Rev 1 1/8 www.st.com Demonstration board description 1 AN3094 Demonstration board description Figure 2. L2293Q block diagram 63 /54 /54 ). 633 ). %.!",% %.!",% ). ). /54 /54 !-V 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 2/8 Function Doc ID 16540 Rev 1 AN3094 Demonstration board description Figure 3. EVAL2293Q demonstration board pin location ). %. ). 633 *0 '.$3 '.$ 63 /54 /54 /54 /54 ). ). %. !-V 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 Doc ID 16540 Rev 1 3/8 (1 ,1 ,1 (1 ,1 ,1 Doc ID 16540 Rev 1 ,1 (1 ,1 5 5 &21 5 - 9VV 287 9VV 287 Q & 287387 ,1387 9VV *1' (1$%/( ,1387 287387 *1' &21 - 9VV -3 287387 ,1387 (1$%/( 9V 9V ,1387 287387 *1' *1' 1& 1& 1& 1& 1& 1& *1' 4/8 1& 1& 1& 1& 1& 1& 1& 1& 8 /4 9V 287 287 9V X9 & 9V 5 5 5 Q & &21 - &21 - ,1 ,1 &21 (1 - 287 287 287 287 Figure 4. 9VV Demonstration board description AN3094 EVAL2293Q demonstration board electrical schematic !-V AN3094 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 !-V Figure 6. EVAL2293Q top layer layout !-V Doc ID 16540 Rev 1 5/8 Demonstration board description Figure 7. AN3094 EVAL2293Q bottom layer layout !-V 6/8 Doc ID 16540 Rev 1 AN3094 2 Revision history Revision history Table 4. Document revision history Date Revision 06-May-2010 1 Changes Initial release. Doc ID 16540 Rev 1 7/8 AN3094 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. 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