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Download The ME118 SN754410 Dual 1A H-Bridge Module
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The ME118 SN754410 Dual 1A H-Bridge Module Rev. 1 Smart Product Design Laboratory – Stanford University Matt Ohline – February 2, 2000 Background: Texas Instrument’s SN754410 is a quadruple half-H driver with control logic, integrated into a 16-pin DIP IC. Each driver has 1A maximum current drive capability. Two half-H drivers may be combined together to form a full H-bridge, so that it can be used for bi-directional control of motors or other peripherals (this is how the ME118 SN754410 Module uses it). The IC has thermal shutdown protection, which will disable the chip if it is operated beyond its current-drive specifications. The ME118 SN754410 Dual 1A H-Bridge Module provides a convenient and robust interface to the SN754410. Separate connectors provide access to the logic-level inputs, H-bridge output connections, and the IC’s power supply. The module makes use of a 74HC14, which simplifies the drive logic by reducing it to two inputs per H-bridge: direction and enable. Clamping diodes are included on the module PCB to protect the circuit from inductive kickback. Using the ME118 SN754410 Dual 1A H-Bridge Module: In order to make use of the ME118 SN754410 Dual 1A H-Bridge Module, you will need to be familiar with the various connectors and their purposes. Since each connector has a single logical function (inputs, outputs, power supply, etc.) this is straightforward. Logic-Level Inputs (J1): Access to the logic-level inputs of the SN754410 is provided through J1. Directional and enable control for each of the IC’s two H-Bridges is specified through these connections. Logic ground connections must also be made through this connector. This will ensure that the ground of the (off-board) logic command circuitry and the ground of the ME118 SN754410 Module agree. The pinout of J1 is as follows: J1 Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Connection logic ground Channel A direction Channel A enable Channel B direction Channel B enable logic ground Motor/Load Connections (J2): Connections of up to two independent motors or similar loads should be made through the screw-terminal connector located at J2. The pinout of J2 is as follows: J2 pin 1 & pin 2 pin 3 & pin 4 Connection motor/load A motor/load B SN754410 Power Supply and High-Current Ground Connector (J3): J3, pin 1 : The SN754410 requires a power supply for its logic circuitry. Provisions for this are made through J3, pin 1. An LM2931Z-5.0 low drop-out, 100mA voltage regulator is provided on the SN754410 Page 1 of 2 Module PCB so that any voltage between 5.6V (minimum) and 18V (maximum) may be supplied to J3, pin 1. This makes the SN754410 module much easier to use, since it includes its own voltage regulation and does not require an externally regulated +5V supply. SN754410 Power Supply Requirements: +5.6V < Vin (J3, pin 1) < +18V J3, pin 2 : Since the SN754410 is capable of switching two H-Bridge channels at a maximum of 1A each, care must be taken in the methods employed returning this substantial current to ground. For this reason, a separate high-current ground connection is available at J3, pin 2. A separate connection should be made between J3, pin 2 and the power supply of the motors/loads connected to the IC’s outputs. This will ensure that the logic power supply maintains a clean ground. ME118 SN754410 Dual 1A H-Bridge Module Schematic: Vm 5V J1 CONTROL GND DIR A ENABLE A DIR B ENABLE B GND 1 2 3 4 5 6 Vm U2 SN754410 U1A 74HC14 1 2 U1B 3 4 16 VCC1 2 1A 7 2A 1 1,2EN 10 3A 15 4A 9 3,4EN 4 GND 5 GND D1 1N4935 VCC28 1Y 3 2Y 6 U3 LM2931Z-5 D5 1N4935 GND 13 GND 12 C1 0.1uF mono 5V DVCC U1C 5 OUT 3 COM 6 U1D + 1IN C2 C3 0.1uF mono D4 1N4935 3Y 11 4Y 14 5V 2 V+ MOTOR GND 1 2 D3 1N4935 C4 0.1uF mono 9 8 U1E 11 10 U1F 120uF 16V elect DGND Page 2 of 2 J2 MOTORS 1 2 3 4 Vm J3 Vin D2 1N4935 13 12 D6 1N4935 D7 1N4935 D8 1N4935 SCREW TERMINALS