LM18293 Four Channel Push-Pull Driver General Description The LM18293 is designed to drive DC loads up to one amp. Typical applications include driving such inductive loads as solenoids, relays and stepper motors along with driving switching power transistors and use as a buffer for low level logic signals. The four inputs accept standard TTL and DTL levels for ease of interfacing. Two enable pins are provided that also accept the standard TTL and DTL levels. Each enable controls 2 channels and when an enable pin is disabled (tied low), the corresponding outputs are forced to the TRI-STATEÉ condition. If the enable pins are not connected (i.e., floating), the circuit will function as if it has been enabled. Separate pins are provided for the main power supply (pin 8), and the logic supply (pin 16). This allows a lower voltage to be used to bias up the logic resulting in reduced power dissipation. The chip is packaged in a specially de- signed 16 pin power DIP. The 4 center pins of this package are tied together and form the die paddle inside the package. This provides much better heat sinking capability than most other DIP packages available. The device is capable of operating at voltages up to 36 volts. Features Y Y Y Y Y Y 1A output current capability per channel Pin for pin replacement for L293B Special 16 pin power DIP package 36 volt operation Internal thermal overload protection Logical ‘‘0’’ input voltage up to 1.5 volts results in high noise immunity Typical Connection TL/H/8706 – 1 FIGURE 1. Application circuit showing bidirectional and on/off control of a single DC motor using two outputs and unidirectional on/off function of two DC motors using a single output each. Order Number LM18293N NS Package Number N16A TRI-STATEÉ is a registered trademark of National Semiconductor Corp. C1995 National Semiconductor Corporation TL/H/8706 RRD-B30M115/Printed in U. S. A. LM18293 Four Channel Push-Pull Driver March 1995 Absolute Maximum Ratings Peak Output Current (Non-Repetitive t e 5 ms) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. Output Drive Supply Voltage (VS) 36V 36V 7V 7V Logic Supply Voltage (VSS) Input Voltage (VI) Enable Voltage (VE) 2A Junction Temperature (TJ) a 150§ C Thermal Resistance Junction to Case (iJC) 14§ C/W Thermal Resistance Junction to Ambient (iJA) 80§ C/W Internal Power Dissipation Internally Limited b 40§ C to a 125§ C Operating Temperature Range b 65§ C to a 150§ C Storage Temperature Range Lead Temperature (Solder 10 seconds) 260§ C Electrical Characteristics VS e 24V, VSS e 5V, T e 25§ C, L e 0.4V, H e 3.5V, each channel, unless otherwise noted Symbol Parameter Conditions Typical Tested Limit (Note 1) Design Limit (Note 2) Units VS Main Supply (Pin 8) Maximum Supply Voltage 36 Vmax VSS Logic Supply (Pin 16) Minimum Logic Supply Voltage Maximum Logic Supply Voltage 4.5 36 Vmin Vmax IS Total Quiescent Supply Current VI e L VI e H IO e 0 IO e 0 VE e H VE e H VE e L 2 16 6 24 4 mAmax mAmax mAmax ISS Total Quiescent Logic Supply Current (pin 16) VI e L VI e H IO e 0 IO e 0 VE e H VE e H VE e L 44 16 16 60 22 24 mAmax mAmax mAmax VI Input Voltage Min Value of Low Max Value of Low Min Value of High Max Value of High (VSS s 7) Max Value of High (VSS l 7) b 0.3 Vmin Vmax Vmin Vmax Vmax II Input Current VE IE VI e L VI e H 1.5 2.3 VSS 7 b 10 30 Enable Voltage (Pins 1, 9) Min Value of Low Max Value of Low Min Value of High Max Value of High (VSS s7) Max Value of High (VSS l7) Enable Current VE e L VE e H 100 b 0.3 1.5 2.3 VSS 7 b 30 b 100 mAmax mAmax Vmin Vmax Vmin Vmax Vmax g 10 mAmax mAmax VCE sat Top Source Saturation Voltage Io e b1 amp 1.4 1.8 Vmax VCE sat Bottom Sink Saturation Voltage Io e 1 amp 1.2 1.8 Vmax tr Rise Time 10%–90% Vo 250 ns tf Fall Time 90%–10% Vo 250 ns ton Turn-On Delay 50% VI to 50% Vo 450 ns toff Turn-Off Delay 50% VI to 50% Vo 200 ns Note 1: Tested limits are guaranteed and 100% production tested. Note 2: Design limits are guaranteed (but not 100% production tested) over the full supply and temperature range. These limits are not used to calculate outgoing quality levels. 2 Connection Diagram Input/Output Truth Table VE (**) VI (Each Channel) VO H H L L H L H L H L X (*) X (*) (*) High output impedance. (**) Relative to the pertinent channel. Enable 1 activates outputs 1 & 2 TL/H/8706 – 2 Enable 2 activates outputs 3 & 4 Simplified Schematic TL/H/8706 – 3 3 Typical Performance Characteristics VS In all cases e 24V Output Voltage vs. Input Voltage Output Voltage vs. Enable Voltage Saturation Voltage vs. Output Current Source Saturation Voltage vs. Ambient Temperature Sink Saturation Voltage vs. Ambient Temperature Quiescent Logic Supply Current vs. Logic Supply Voltage TL/H/8706 – 4 Typical Applications DC motor controls (with connections to ground and to the supply voltages) Bidirectional DC motor control TL/H/8706 – 5 TL/H/8706 – 6 VE Pin 10 Pin 15 M1 H H H Fast Motor Stop Run H H L Fast Motor Stop Fast Motor Stop H L H Run Run H L L Run Fast Motor Stop L L e Low X X H e High Free Running Motor Stop Inputs M2 Pin 10 e H Pin 15 e L VE e H VE e L Free Running Motor Stop L e Low X e Don’t care 4 H e High Function Turn CW Pin 10 e L Pin 15 e H Turn CCW Pin 10 e Pin 15 Fast Motor Stop Pin 10 e X Pin 15 e X Free Running Motor Stop X e Don’t care Motor Control Block Diagram Bipolar Stepping Motor Control Step Sequencing Tables Full Step * VIN 1 VIN 2 Step L L 1 L H 2 H H 3 H L 4 L L 1 *VE 1 and VE 2 e H Half Step VE 1 VE 2 VIN 1 VIN 2 Step H L L X 1 H H L L 2 L H X L 3 H H H L 4 H L H X 5 H H H H 6 L H X H 7 H H L H 8 L X 1 H H e High L L e Low TL/H/8706 – 7 X e Don’t care Mounting Instructions The junction to ambient thermal resistance of the LM18293 can be reduced by soldering the ground pins to a suitable copper area of the printed circuit board or to an external heatsink. The graph below, which shows the maximum power dissipated and junction to ambient thermal resistance as a function of the side ‘‘l’’ of two equal square copper areas having a thickness of 35m, illustrates this. In addition, it is possible to use an external heatsink (see illustration below). During soldering the pins temperature must not exceed 230§ C and the soldering time must not be longer than 12 seconds. The external heatsink or printed circuit copper area must be connected to electrical ground. TL/H/8706 – 8 Staver External Heat-sink Maximum power dissipated and junction to ambient thermal resistance vs. size TL/H/8706 – 9 TL/H/8706 – 10 5 LM18293 Four Channel Push-Pull Driver Mounting Instructions (Continued) Maximum Allowable Power Dissipation vs Ambient Temperature TL/H/8706 – 11 Physical Dimensions inches (millimeters) Lit. Ý 108380 Molded Dual-In-Line Package (N) Order Number LM18293N NS Package Number N16A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Corporation 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 2. 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