LMD18245 NSC | Alldatasheet

Document overview

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Technical content

Features

n DMOS power stage rated at 55V and 3A continuous n Low RDS(ON) of typically 0.3Ω per power switch n Internal clamp diodes n Low-loss current sensing method n Digital or analog control of motor current n TTL and CMOS compatible inputs n Thermal shutdown (outputs off) at TJ = 155˚C n Overcurrent protection n No shoot-through currents n 15-lead TO-220 molded power package

Applications

n Full, half and microstep stepper motor drives n Stepper motor and brushed DC motor servo drives n Automated factory, medical and office equipment Functional Block and Connection Diagram(15-Lead TO-220 Molded Power Package (T) ) DS011878-1 Order Number LMD18245T See NS Package Number TA15A April 1998 LMD18245 3A, 55V DMOS Full-Bridge Motor Driver © 1998 National Semiconductor Corporation DS011878 www.national.com

Absolute Maximum Ratings(Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. DC Voltage at: OUT 1, V CC , and OUT 2 +60V COMP OUT, RC, M4, M3, M2, M1, BRAKE, +12V DIRECTION, CS OUT, and DAC REF DC Voltage PGND to SGND ±400mV Continuous Load Current 3A Peak Load Current (Note 2) 6A Junction Temperature (T J(max)) +150˚C Power Dissipation (Note 3) : TO-220 (TA = 25˚C, Infinite Heatsink) 25W TO-220 (TA = 25˚C, Free Air) 3.5W ESD Susceptibility (Note 4) 1500V Storage Temperature Range (T S) −40˚C to +150˚C Lead Temperature (Soldering, 10 seconds) 300˚C Operating Conditions(Note 1) Temperature Range (TJ) (Note 3) −40˚C to +125˚C Supply Voltage Range (VCC ) +12V to +55V CS OUT Voltage Range 0V to +5V DAC REF Voltage Range 0V to +5V MONOSTABLE Pulse Range 10 µs to 100 ms Electrical Characteristics(Note 2) The following specifications apply for VCC = +42V, unless otherwise stated.Boldface limits apply over the operating tem- perature range, −40˚C≤ TJ ≤ +125˚C.All other limits apply for TA = TJ = 25˚C. Symbol Parameter Conditions Typical Limit Units (Note 5) (Note 5) (Limits) ICC Quiescent Supply Current DAC REF = 0V, VCC = +20V 8 mA 15 mA (max) POWER OUTPUT STAGE R DS(ON) Switch ON Resistance I LOAD = 3A 0.3 0.4 Ω (max) 0.6 Ω (max) ILOAD = 6A 0.3 0.4 Ω (max) 0.6 Ω (max) VDIODE Body Diode Forward Voltage I DIODE = 3A 1.0 V

1.5 V(max)

Trr Diode Reverse Recovery Time I DIODE = 1A 80 ns Q rr Diode Reverse Recovery Charge IDIODE = 1A 40 nC tD(ON) Output Turn ON Delay Time Sourcing Outputs I LOAD = 3A 5 µs Sinking Outputs I LOAD = 3A 900 ns tD(OFF) Output Turn OFF Delay Time Sourcing Outputs I LOAD = 3A 600 ns Sinking Outputs I LOAD = 3A 400 ns tON Output Turn ON Switching Time Sourcing Outputs I LOAD = 3A 40 µs Sinking Outputs I LOAD = 3A 1 µs tOFF Output Turn OFF Switching Time Sourcing Outputs I LOAD = 3A 200 ns Sinking Outputs I LOAD = 3A 80 ns tpw Minimum Input Pulse Width Pins 10 and 11 2 µs tDB Minimum Dead Band (Note 6) 40 ns CURRENT SENSE AMPLIFIER Current Sense Output I LOAD = 1A (Note 7) 200 µA (min) 250 175 µA (min) 300 µA (max) 325 µA (max) Current Sense Linearity Error 0.5A ≤ I LOAD ≤ 3A (Note 7) ±6 % ±9 % (max) Current Sense Offset I LOAD = 0A 5 µA 20 µA (max) www.national.com 2

Electrical Characteristics(Note 2) (Continued) The following specifications apply for VCC = +42V, unless otherwise stated.Boldface limits apply over the operating tem- perature range, −40˚C≤ TJ ≤ +125˚C.All other limits apply for TA = TJ = 25˚C. Symbol Parameter Conditions Typical Limit Units (Note 5) (Note 5) (Limits) DIGITAL-TO-ANALOG CONVERTER (DAC) Resolution 4 Bits (min) Monotonicity 4 Bits (min) Total Unadjusted Error 0.125 0.25 LSB (max)

0.5 LSB (max)

IREF DAC REF Input Current DAC REF = +5V −0.5 µA ±10 µA (max) COMPARATOR AND MONOSTABLE Comparator High Output Level 6.27 V Comparator Low Output Level 88 mV Comparator Output Current Source 0.2 mA Sink 3.2 mA t DELAY Monostable Turn OFF Delay (Note 8) 1.2 µs 2.0 µs (max) PROTECTION AND PACKAGE THERMAL RESISTANCES Undervoltage Lockout, VCC 5 V (min)

8 V (max)

T JSD Shutdown Temperature, TJ 155 ˚C Package Thermal Resistances θJC Junction-to-Case, TO-220 1.5 ˚C/W θJA Junction-to-Ambient, TO-220 35 ˚C/W LOGIC INPUTS V IL Low Level Input Voltage −0.1 V (min)

0.8 V (max)

VIH High Level Input Voltage 2 V (min)

12 V (max)

IIN Input Current V IN = 0V or 12V ±10 µA (max) Note 1:Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device outside the rated Operating Conditions. Note 2:Unless otherwise stated, load currents are pulses with widths less than 2 ms and duty cycles less than 5% . Note 3:The maximum allowable power dissipation at any ambient temperature is PMax = (125 − TA)/θJA, where 125˚C is the maximum junction temperature for op- eration, TA is the ambient temperature in ˚C, andθJAis the junction-to-ambient thermal resistance in ˚C/W. Exceeding Pmax voids the Electrical Specifications by forc- ing TJabove 125˚C. If the junction temperature exceeds 155˚C, internal circuitry disables the power bridge. When a heatsink is used,θJAis the sum of the junction-to-case thermal resistance of the package,θJC, and the case-to-ambient thermal resistance of the heatsink. Note 4:ESD rating is based on the human body model of 100 pF discharged through a 1.5 kΩ resistor. M1, M2, M3 and M4, pins 8, 7, 6 and 4 are protected to 800V. Note 5:All limits are 100% production tested at 25˚C. Temperature extreme limits are guaranteed via correlation using accepted SQC (Statistical Quality Control) methods. All limits are used to calculate AOQL (Average Outgoing Quality Level). Typicals are at TJ = 25˚C and represent the most likely parametric norm. Note 6:Asymmetric turn OFF and ON delay times and switching times ensure a switch turns OFF before the other switch in the same half H-bridge begins to turn ON (preventing momentary short circuits between the power supply and ground). The transitional period during which both switches are OFF is commonly referred to as the dead band. Note 7:(I LOAD ,ISENSE ) data points are taken for load currents of 0.5A, 1A, 2A and 3A. The current sense gain is specified as ISENSE /ILOAD for the 1A data point. The current sense linearity is specified as the slope of the line between the 0.5A and 1A data points minus the slope of the line between the 2A and 3A data points all divided by the slope of the line between the 0.5A and 1A data points. Note 8:Turn OFF delay, t DELAY , is defined as the time from the voltage at the output of the current sense amplifier reaching the DAC output voltage to the lower DMOS switch beginning to turn OFF. With VCC = 32V, DIRECTION high, and 200Ω connected between OUT1 and VCC , the voltage at RC is increased from 0V to 5V at 1.2V/µs, and tDELAY is measured as the time from the voltage at RC reaching 2V to the time the voltage at OUT 1 reaches 3V. 3 www.national.com

Typical Performance Characteristics RDS(ON) vs Temperature DS011878-29 RDS(ON) vs Load Current DS011878-30 RDS(ON) vs Supply Voltage DS011878-31 Current Sense Output vs Load Current DS011878-32 Supply Current vs Supply Voltage DS011878-33 Supply Current vs Temperature DS011878-34 www.national.com 4

FIGURE 1. Chopper Amplifier Chopping States: Full VCC Applied Across the Winding (a) and (d), Shorted Winding (b)

FIGURE 7. Winding Currents and Digital Control Signals for One-Phase-On Drive (Wave Drive)

Test Circuit and Switching Time Definitions DS011878-28 www.national.com 16

Physical Dimensionsinches (millimeters) unless otherwise noted LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or sys- tems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose fail- ure 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. 2. A critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5620-6175 Fax: 81-3-5620-6179 15-Lead TO-220 Power Package (T) Order Number LMD18245T LMD18245 3A, 55V DMOS Full-Bridge Motor Driver National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.