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2917 DUAL FULL-BRIDGE PWM MOTOR DRIVER
2917
DUAL FULL-BRIDGE PWM MOTOR DRIVER
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 modulation (PWM) control of the output current to 1.5 A.
39 GND
Data Sheet 29319.22*
SENSE 1
PHASE 1
VREF 1
ENABLE 1
43
42
41
RC1
E
44
EN1
VCC
1
40
6
5
4
3
2
1
LOGIC SUPPLY
OUT 1A
OUT 1B
I10
I11
1
GND
7 8 9 10 11 12 13 14 15 16
VBB
PWM 1
38 37
1
36 35 34 33
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 temperature exceeds safe operating limits. The UDN2917EB is supplied in a 44-lead power PLCC for surfacemount applications. Its batwing construction provides for maximum package power dissipation in the smallest possible construction. The UDN2917EB is available for operation from -40C to +85C. To order, change the prefix from 'UDN' to 'UDQ'. This device is also available on special order for operation to +125C.
2
32 31 30 PWM 2 29 GND
GND
17
2
26
27
2
EN 2 ENABLE RC 2 28
19
LOAD SUPPLY 22
OUT 2B 21
OUT 2A 18
SENSE 2 20
V REF 2 25
I20 23
I21 24
PHASE 2
E2
Dwg. PP-021
Dwg. PP-021
ABSOLUTE MAXIMUM RATINGS
at TJ +150C
Motor Supply Voltage, VBB .................... 45 V Output Current, IOUT (t w 20 s) ..... 1.75 A (Continuous) ............................... 1.5 A Logic Supply Voltage, VCC .................... 7.0 V Logic Input Voltage Range, VIN ................................ -0.3 V to +7.0 V Output Emitter Voltage, VE ................... 1.0 V Package Power Dissipation, PD ......................................... See Graph Operating Temperature Range, TA .................................. -20C to +85C Storage Temperature Range, TS ................................ -55C to +150C
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 +150C.
FEATURES
s s s s s s
1.5 A Continuous Output Current 45 V Output Sustaining Voltage Internal Clamp Diodes Digital Control of Output Current Internal Thermal Shutdown Circuitry Similar to Dual PBL3770
Always order by complete part number: UDN2917EB .
2917 DUAL FULL-BRIDGE PWM MOTOR DRIVER
PWM CURRENT-CONTROL CIRCUITRY
CHANNEL 1 PIN NUMBERS SHOWN. V
BB 22
OUT B
6 3
OUT A V REF 44 20 k /10 40 k 10 k I0 2 I1 1 RS
5
E SENSE -
4
+
ONE SHOT
41
SOURCE DISABLE
RC CC RT
RC
CT
Dwg. EP-007-2A
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
TRUTH TABLE
12.5
Enable
R J
Phase H L X
OutA H L Z
OutB L H Z
10
L L H
X = Don't care Z = High impedance
T
/W C =6
7.5
5.0
2.5
R
JA
= 30 C/W
0 25 50 75 100 TEMPERATURE IN C 125 150
Dwg. GP-020B
115 Northeast Cutoff, Box 15036 W Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1991, 1997 Allegro MicroSystems, Inc.
2917 DUAL FULL-BRIDGE PWM MOTOR DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25C, VBB = 45 V, VCC = 5.0 V, VREF = 5.0 V (unless otherwise noted).
Limits Characteristic Output Drivers (OUTA or OUTB) Motor Supply Range Output Leakage Current VBB ICEX VOUT = VBB VOUT = 0 Output Sustaining Voltage Output Saturation Voltage VCE(sus) VCE(SAT) IOUT = 1.5 A, L = 3.5 mH Sink Driver, IOUT = +1.0 A* Sink Driver, IOUT = +1.5 A* Source Driver, IOUT = -1.0 A* Source Driver, IOUT = -1.5 A* Clamp Diode Leakage Current Clamp Diode Forward Voltage Driver Supply Current IR VF IBB(ON) IBB(OFF) Control Logic Input Voltage VIN(1) VIN(0) Input Current IIN(1) IIN(0) Reference Voltage Range Current Limit Threshold (at trip point) VREF VREF/VSENSE All Inputs All Inputs VIN = 2.4 V VIN = 0.8 V Operating I0 = I1 = 0.8 V I0 = 2.4 V, I1= 0.8 V I0 = 0.8 V, I1 = 2.4 V Thermal Shutdown Temp. Total Logic Supply Current TJ ICC(ON) ICC(OFF) I0 = I1 = VEN = 0.8 V, No Load I0 = I1 = 2.4 V, No Load 2.4 -- -- -- 1.5 9.5 13.5 25.5 -- -- -- -- -- <1.0 -3.0 -- 10 15 30 170 90 10 -- 0.8 20 -200 7.5 10.5 16.5 34.5 -- 105 12 V V A A V -- -- -- C mA mA VR = 45 V IF = 1.5 A Both Bridges ON, No Load Both Bridges OFF 10 -- -- 45 -- -- -- -- -- -- -- -- -- <1.0 <-1.0 -- 0.5 0.8 1.8 1.9 <1.0 1.6 9.0 4.0 45 50 -50 -- 0.7 1.0 1.9 2.1 50 2.0 12 6.0 V A A V V V V V A V mA mA Symbol Test Conditions Min. Typ. Max. Units
Negative current is defined as coming out of (sourcing) the specified device pin. Typical Data is for design information only. * Pulse test (<10 ms).
2917 DUAL FULL-BRIDGE PWM MOTOR DRIVER
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 controlled independently in each bridge by an external sense resistor (RS ), internal comparator, 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 (VSENSE) reaches the level set at the comparator's input: ITRIP = VREF/10 RS The comparator then triggers the monostable which turns OFF the source driver of the bridge. The actual load current peak will be slightly higher than the trip point (especially for low-inductance loads) because of the internal logic and switching delays. This delay (td) is typically 2 s. 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 decrease) is determined by the monostable's external RC timing components, where toff = RTCT within the range of 20 k to 100 k 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 (toff) is set too short. This circuitry prevents the source driver from being re-enabled until the load current has decayed to below the ITRIP level.
RS
td t off
Dwg. WM-003-1A
PWM OUTPUT CURRENT WAVEFORM
V PHASE
+ I OUT 0 -
I TRIP
LOAD CURRENT PATHS
V BB
BRIDGE ON SOURCE OFF ALL OFF
Dwg. EP-006-1
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2917 DUAL FULL-BRIDGE PWM MOTOR DRIVER
CURRENT-CONTROL TRUTH TABLE
I0 L H L H I1 L L H H Output Current VREF /10 RS = ITRIP VREF /15 RS = 2/3 ITRIP VREF /30 RS = 1/3 ITRIP 0
Loads with high distributed capacitances may result in high turnON current peaks. This peak (appearing across RS) will attempt to trip the comparator, resulting in erroneous current control or high-frequency oscillations. An external RCCC 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 P-controlled drive formats. During half-step operations, the I0 and I1 inputs allow the P to control the motor at a constant torque between all positions in an eightstep 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 (VBB), a large-value capacitor (47 F) should be connected from VBB 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 (approximately 3 s) prevents crossover currents that can occur when switching the PHASE input. All four drivers in the bridge output can be turned OFF (VEN 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 (VREF) provides continuous control of the peak load current for micro-stepping applications, within the specified limits for VREF. Thermal protection circuitry turns OFF all drivers when the junction temperature reaches +170C. 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 +145C.
2917 DUAL FULL-BRIDGE PWM MOTOR DRIVER
UDN2917EB
Dimensions in Inches (controlling dimensions)
28 18
29 0.319 0.291 0.021 0.013 0.695 0.685 0.656 0.650 0.319 0.291 0.050
BSC INDEX AREA
17
0.032 0.026
39
7
40 0.020
MIN
44
1
2
6
0.656 0.650 0.695 0.685
Dwg. MA-005-44A in
0.180 0.165
Dimensions in Millimeters (for reference only)
28 18
29 8.10 7.39 0.533 0.331 17.65 17.40 16.662 16.510
INDEX AREA
17
0.812 0.661
8.10 7.39 1.27
BSC
39
7
40 0.51
MIN
44
1
2
6
4.57 4.20
16.662 16.510 17.65 17.40
Dwg. MA-005-44A mm
NOTES: 1. MO-047AC except for terminal shoulder height. Intended to meet new JEDEC Standard when that is approved. 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.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2917 DUAL FULL-BRIDGE PWM MOTOR DRIVER
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2917 DUAL FULL-BRIDGE PWM MOTOR DRIVER
BRIDGE & HALF-BRIDGE DRIVERS SELECTION GUIDE
IN ORDER OF 1) OUTPUT CURRENT AND 2) OUTPUT VOLTAGE
Output Ratings * mA 650 750 V 30 30 45 45 45 33 14 7.0 50 45 45 50 50 45 50 50 50 45 45 14 Description Dual PWM Full Bridge Dual PWM Full Bridge Dual PWM Full Bridge Dual PWM Full Bridge Dual PWM Full Bridge Dual PWM Full Bridge 3-O Back-EMF Controller/Driver 3-O Back-EMF Controller/Driver PWM Full Bridge Dual PWM Full Bridge Dual PWM Full Bridge PWM Microstepping Full Bridge PWM Microstepping Full Bridge 3-O Brushless Controller/Driver Dual Full Bridge PWM Full-Bridge PWM Full-Bridge PWM Control PWM Control 3-O Brushless Controller/Driver Internal Diodes X X X X X X X X X X X X X X X X X X X X
Features Outputs Bipolar Bipolar Bipolar Bipolar Bipolar Bipolar DMOS NMOS Bipolar Bipolar Bipolar Darlington/SatlingtonTM Darlington/SatlingtonTM Darlington Darlington Darlington Darlington Darlington Bipolar DMOS Internal Protection X X X X X X X X X X X X X X X X X - X X Part Number 3966 3968 2916 2919 6219 3964 8902-A 8984 3953 2917 2918 3955 3957 2936 2998 3951 3952 2962 2961 8925
800 900 1000 1300 1500
2000
3000 3400 4000
* Current is maximum specified test condition, voltage is maximum rating. See specification for sustaining voltage limits or overcurrent protection voltage limits. Complete part number includes additional characters to indicate operating temperature range and package style.
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 design of its products. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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