2917 ALLEGRO
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Technical content
The UDN2917EB motor driver is designed to drive both windings of a bipolar stepper motor or bidirectionally control two dc motors. Both bridges are capable of sustaining 45 V and include internal pulse-width modula- tion (PWM) control of the output current to 1.5 A. For PWM current control, the maximum output current is determined by the user’s selection of a reference voltage and sensing resistor. Two logic-level inputs select output current limits of 0, 33%, 67%, or 100% of the maximum level. A PHASE input to each bridge determines load current direction. Active- low ENABLE inputs control the four drivers in each bridge. The bridges include both ground clamp and flyback diodes for protection against inductive transients. Internally generated delays prevent cross-over currents when switching current direction. Special power-up sequencing is not required. Thermal protection circuitry disables the outputs if the chip tempera- ture exceeds safe operating limits. The UDN2917EB is supplied in a 44-lead power PLCC for surface-mount applications. Its batwing construction provides for maximum package power dissipation in the smallest possible construction. The UDN2917EB is available for operation from -40°C to +85°C. To order, change the prefix from 'UDN' to 'UDQ'. This device is also available on special order for operation to +125°C. 2 9 1 7 DUAL FULL-BRIDGE PWM MOTOR DRIVER GND GND GND GND 17 29 Dwg. PP-021 PWM 1 PWM 2 LOGIC SUPPLY OUT 1A SENSE 1 I10 VREF 1 PHASE1 RC1 ENABLE 1 I11 OUT1B LOAD SUPPLY E OUT 2A I20 SENSE 2 V REF 2 PHASE 2 RC 2 ENABLE 2 I21 OUT 2B EN2 VCC VBB 1ENθ ABSOLUTE MAXIMUM RATINGS at TJ ≤ +150°C Logic Input Voltage Range, Package Power Dissipation, Operating Temperature Range, Storage Temperature Range, Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified peak current rating or a junction temperature of +150°C. Always order by complete part number: UDN2917EB . Dwg. PP-021 Data Sheet29319.22†
FEATURES
I 1.5 A Continuous Output Current I 45 V Output Sustaining Voltage I Internal Clamp Diodes I Digital Control of Output Current I Internal Thermal Shutdown Circuitry I Similar to Dual PBL3770
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000 PWM CURRENT-CONTROL CIRCUITRY TRUTH TABLE Enable Phase Out A OutB LH H L LL L H HX Z Z X = Don’t care Z = High impedance 50 75 100 125 150 ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS TEMPERATURE IN °C Dwg. GP-020B 12.5 2.5 7.5 5.0 R = 30 °C/W θJA R = 6°C/W θJT VREF Dwg. EP-007-2A VBB SENSE ONE SHOT SOURCE DISABLE RC ÷10 E OUTA OUTB CHANNEL 1 PIN NUMBERS SHOWN. RC RS RT CC CT 20 kΩ 40 kΩ 10 kΩ Copyright © 1991, 2000 Allegro MicroSystems, Inc.
www.allegromicro.com Limits (at trip point) ELECTRICAL CHARACTERISTICS at TA = +25°C, VBB = 45 V, VCC = 5.0 V, VREF = 5.0 V (unless otherwise noted). Characteristic Symbol Test Conditions Min. Typ. Max. Units Output Drivers (OUTA or OUTB) Motor Supply Range V BB 10 — 45 V Output Leakage Current I CEX VOUT = VBB — <1.0 50 µA VOUT = 0 — <-1.0 -50 µA Output Sustaining Voltage V CE(sus) IOUT = ±1.5 A, L = 3.5 mH 45 —— V Output Saturation Voltage V CE(SAT) Sink Driver, IOUT = +1.0 A* — 0.5 0.7 V Sink Driver, IOUT = +1.5 A* — 0.8 1.0 V Source Driver, IOUT = -1.0 A* — 1.8 1.9 V Source Driver, IOUT = -1.5 A* — 1.9 2.1 V Clamp Diode Leakage Current I R VR = 45 V — <1.0 50 µA Clamp Diode Forward Voltage V F IF = 1.5 A — 1.6 2.0 V Driver Supply Current I BB(ON) Both Bridges On, No Load — 9.0 12 mA IBB(OFF) Both Bridges Off — 4.0 6.0 mA Control Logic Input Voltage V IN(1) All Inputs 2.4 —— V VIN(0) All Inputs —— 0.8 V Input Current I IN(1) VIN = 2.4 V — <1.0 20 µA IIN(0) VIN = 0.8 V — -3.0 -200 µA Reference Voltage Range V REF Operating 1.5 — 7.5 V Current Limit Threshold V REF/VSENSE I0 = I1 = 0.8 V 9.5 10 10.5 — I0 = 2.4 V, I1= 0.8 V 13.5 15 16.5 — I0 = 0.8 V, I1 = 2.4 V 25.5 30 34.5 — Thermal Shutdown Temp. T J — 170 — °C Total Logic Supply Current I CC(ON) I0 = I1 = VEN = 0.8 V, No Load — 90 105 mA ICC(OFF) I0 = I1 = 2.4 V, No Load — 10 12 mA Negative current is defined as coming out of (sourcing) the specified device pin. Typical Data is for design information only. * Pulse test (<10 ms).
Worcester, Massachusetts 01615-0036 (508) 853-5000 Dwg. WM-003-1A VPHASE I OUT td toff I TRIP APPLICATIONS INFORMATION PWM CURRENT CONTROL The UDN2917EB dual bridge is designed to drive both windings of a bipolar stepper motor. Output current is sensed and con- trolled independently in each bridge by an external sense resistor (R S), internal com- parator, and monostable multivibrator. When the bridge is turned on, current increases in the motor winding and it is sensed by the external sense resistor until the sense voltage (V SENSE) reaches the level set at the comparator’s input: ITRIP = VREF/10 RS The comparator then triggers the mon- ostable which turns off the source driver of the bridge. The actual load current peak will be slightly higher than the trip point (espe- cially for low-inductance loads) because of the internal logic and switching delays. This delay (t d) is typically 2 µs. After turn-off, the motor current will normally decay, circulating through the ground clamp diode and sink transistor. The source driver ’s off time (and therefore the magnitude of the current de- crease) is determined by the monostable ’s external RC timing components, where t off = RTCT within the range of 20 kΩ to 100 kΩ and 200 pF to 500 pF. When the source driver is re-enabled, the winding current (the sense voltage) is again allowed to rise to the comparator ’s threshold. This cycle repeats itself, maintaining the average motor winding current at the desired level. Special circuitry has been included to prevent runaway current control when the fixed off time (t off) is set too short. This circuitry prevents the source driver from being re-enabled until the load current has decayed to below the I TRIP level. PWM OUTPUT CURRENT WAVEFORM LOAD CURRENT PATHS Dwg. EP-006-1 RS BBV BRIDGE ON SOURCE OFF ALL OFF
www.allegromicro.com Loads with high distributed capacitances may result in high turn-on current peaks. This peak (appearing across R S) will attempt to trip the comparator, resulting in erroneous current control or high-frequency oscillations. An external R CCC low-pass filter may be needed to delay the action of the comparator. LOGIC CONTROL OF OUTPUT CURRENT Two logic level inputs (I0 and I1) allow digital selection of the motor winding current at 100%, 67%, 33%, or 0% of the maximum level per the table. The 0% output current condition turns off all drivers in the bridge and can be used as an output enable function. These logic level inputs greatly enhance the implementation of µP-controlled drive formats. During half-step operations, the I 0 and I1 inputs allow the µP to control the motor at a constant torque between all positions in an eight- step sequence. This is accomplished by digitally selecting 100% drive current when only one phase is on and 67% drive current when two phases are on. The logic control inputs can also be used to select a reduced current level (and reduced power dissipation) for ‘hold’ conditions and/or increased current (and available torque) for start-up conditions. GENERAL To avoid excessive voltage spikes on the LOAD SUPPLY pin BB), a large-value capacitor (≥47 µF) should be connected from V BB to ground as close as possible to the device. Under no circumstances should the voltage at LOAD SUPPLY exceed 45 V. The PHASE input to each bridge determines the direction motor winding current flows. An internally generated deadtime (approxi- mately 3 µs) prevents crossover currents that can occur when switch- ing the PHASE input. All four drivers in the bridge output can be turned off (V EN ≥ 2.4 V or I0 = I1 ≥ 2.4 V), resulting in a fast current decay through the internal output clamp and flyback diodes. The fast current decay is desirable in half-step and high-speed applications. All logic inputs float high; the ENABLE input must be tied low if it is not used. Varying the reference voltage (V REF) provides continuous control of the peak load current for micro-stepping applications, within the specified limits for V REF. Thermal protection circuitry turns off all drivers when the junction temperature reaches +170°C. It is only intended to protect the device from failures due to excessive junction temperature and should not imply that output short circuits are permitted. The output drivers are re-enabled when the junction temperature cools to +145 °C. I0 I1 Output Current LL V REF/10 RS = ITRIP HL V REF /15 RS = 2/3 ITRIP LH V REF /30 RS = 1/3 ITRIP HH 0 CURRENT-CONTROL TRUTH TABLE
Worcester, Massachusetts 01615-0036 (508) 853-5000 UDN2917EB Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only) NOTES:1. MO-047AC except for terminal shoulder height. 2. Webbed lead frame. Leads 7-17 and 29-39 are internally one piece. 3. Lead spacing tolerance is non-cumulative. 4. Exact body and lead configuration at vendor’s option within limits shown. 5. Supplied in standard sticks/tubes of 27 devices or add “TR” to part number for tape and reel. 1828 Dwg. MA-005-44A in 0.020 MIN 0.050 BSC 144 0.021 0.013 INDEX AREA 2 6 1729 0.695 0.685 0.032 0.026 0.319 0.291 0.319 0.291 0.180 0.165 0.695 0.685 0.656 0.650 0.656 0.650 Dwg. MA-005-44A mm 17.65 17.40 0.51 MIN 4.57 4.20 17.65 17.40 16.662 16.510 1.27 BSC 0.812 0.661 144 0.533 0.331 INDEX AREA 16.662 16.510 8.10 7.39 8.10 7.39
www.allegromicro.com The products described here are manufactured under one or more Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro products are not authorized for use as critical components in life-support devices or systems without express written approval. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsi- bility for its use; nor for any infringement of patents or other rights of third parties which may result from its use.
Worcester, Massachusetts 01615-0036 (508) 853-5000 MOTOR DRIVERS Function Output Ratings* Part Number † INTEGRATED CIRCUITS FOR BRUSHLESS DC MOTORS 3-Phase Power MOSFET Controller — 28 V 3933 3-Phase Power MOSFET Controller — 50 V 3932 3-Phase Power MOSFET Controller — 50 V 7600 2-Phase Hall-Effect Sensor/Driver 400 mA 26 V 3626 Bidirectional 3-Phase Back-EMF Controller/Driver ±600 mA 14 V 8906 2-Phase Hall-Effect Sensor/Driver 900 mA 14 V 3625 3-Phase Back-EMF Controller/Driver ±900 mA 14 V 8902–A 3-Phase Controller/Drivers ±2.0 A 45 V 2936 & 2936-120 INTEGRATED BRIDGE DRIVERS FOR DC AND BIPOLAR STEPPER MOTORS Dual Full Bridge with Protection & Diagnostics ±500 mA 30 V 3976 PWM Current-Controlled Dual Full Bridge ±650 mA 30 V 3966 PWM Current-Controlled Dual Full Bridge ±650 mA 30 V 3968 PWM Current-Controlled Dual Full Bridge ±750 mA 45 V 2916 PWM Current-Controlled Dual Full Bridge ±750 mA 45 V 2919 PWM Current-Controlled Dual Full Bridge ±750 mA 45 V 6219 PWM Current-Controlled Dual Full Bridge ±800 mA 33 V 3964 PWM Current-Controlled Full Bridge ±1.3 A 50 V 3953 PWM Current-Controlled Dual Full Bridge ±1.5 A 45 V 2917 PWM Current-Controlled Microstepping Full Bridge ±1.5 A 50 V 3955 PWM Current-Controlled Microstepping Full Bridge ±1.5 A 50 V 3957 PWM Current-Controlled Dual DMOS Full Bridge ±1.5 A 50 V 3972 Dual Full-Bridge Driver ±2.0 A 50 V 2998 PWM Current-Controlled Full Bridge ±2.0 A 50 V 3952 DMOS Full Bridge PWM Driver ±2.0 A 50 V 3958 Dual DMOS Full Bridge ±2.5 A 50 V 3971 UNIPOLAR STEPPER MOTOR & OTHER DRIVERS Voice-Coil Motor Driver ±500 mA 6 V 8932–A Voice-Coil Motor Driver ±800 mA 16 V 8958 Unipolar Stepper-Motor Quad Drivers 1 A 46 V 7024 & 7029 Unipolar Microstepper-Motor Quad Driver 1.2 A 46 V 7042 Unipolar Stepper-Motor Translator/Driver 1.25 A 50 V 5804 Unipolar Stepper-Motor Quad Driver 1.8 A 50 V 2540 Unipolar Stepper-Motor Quad Driver 1.8 A 50 V 2544 Unipolar Stepper-Motor Quad Driver 3 A 46 V 7026 Unipolar Microstepper-Motor Quad Driver 3 A 46 V 7044 * Current is maximum specified test condition, voltage is maximum rating. See specification for sustaining voltage limits or over-current protection voltage limits. Negative current is defined as coming out of (sourcing) the output. † Complete part number includes additional characters to indicate operating temperature range and package style. Also, see 3175, 3177, 3235, and 3275 Hall-effect sensors for use with brushless dc motors.