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2916
UDN2916B (DIP)
OUT 1A OUT 2A E2 S E NS E 2 OUT 2B G R OUND G R OUND I 02 I 12 P HAS E 2 V REF 2 RC 2 1 2 3 4 5 6 7 8
P WM 1
DUAL FULL-BRIDGE PWM MOTOR DRIVER
VBB LOAD S UP P LY E1 S E NS E 1 OUT 1B I 01 G R OUND G R OUND I 11 P HAS E 1 V REF 1 RC 1 LOG IC S UP P LY
24 23
1 2
22 21 20 19 18 17 1 16 15 14 V CC 13
The UDN2916B, UDN2916EB, and UDN2916LB motor drivers are 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 750 mA. The outputs have been optimized for a low output saturation voltage drop (less than 1.8 V total source plus sink at 500 mA). 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. 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 UDN2916B is supplied in a 24-pin dual in-line plastic batwing package with a copper lead-frame and heat sinkable tabs for improved power dissipation capabilities. The UDN2916EB is supplied in a 44lead power PLCC for surface mount applications. The UDN2916LB is supplied in a 24-lead surface-mountable SOIC. Their batwing construction provides for maximum package power dissipation in the smallest possible construction. The UDN2916B, UDN2916EB, and UDN2916LB are available for operation from -20C to 85C. The UDQ2916B and UDQ2916LB are available for operation from -40C to 105C. All packages are lead (Pb) free, with 100% matte tin leadframe.
Data Sheet 29319.20L
9 9 10 11 12 2
P WM 2
Dwg. P P -005
ABSOLUTE MAXIMUM RATINGS
at TJ 150C
Motor Supply Voltage, VBB .................... 45 V Output Current, IOUT (Peak) ........................................ +1.0 A (Continuous) .......................... +750 mA Logic Supply Voltage, VCC ................... 7.0 V Logic Input Voltage Range, VIN ......................... -0.3 V to VCC+0.3 V Output Emitter Voltage, VE .................. 1.5 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
750 mA Continuous Output Current 45 V Output Sustaining Voltage Internal Clamp Diodes Internal PWM Current Control Low Output Saturation Voltage Internal Thermal Shutdown Circuitry Similar to Dual PBL3717, UC3770
2916 DUAL FULL-BRIDGE MOTOR DRIVER
Selection Guide
Part Number Pb-free * Package Packing Ambient Temperature (C) -20 to 85 -40 to 105 -20 to 85 -20 to 85 -20 to 85 -20 to 85 -40 to 105
UDN2916B-T UDQ2916B-T UDN2916EB-T UDN2916EBTR-T UDN2916LB-T UDN2916LBTR-T UDQ2916LBTR-T
*
Yes Yes Yes Yes Yes Yes Yes
24-Pin DIP 24-Pin DIP 44-Lead PLCC 44-Lead PLCC 24-Lead SOIC 24-Lead SOIC 24-Lead SOIC
15 per tube 15 per tube 17 per tube 450 per reel 31 per tube 1000 per reel 1000 per reel
Pb-based variants are being phased out of the product line. The variants cited in this footnote are in production but have been determined to be LAST TIME BUY. This classification indicates that sale of this device is currently restricted to existing customer applications. The variants should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: October 31, 2006. Deadline for receipt of LAST TIME BUY orders: April 27, 2007. These variants include: UDN2916B, UDQ2916EB, UDN2916EB, UDQ2916EBTR, UDN2916EBTR, UDN2916LB, UDQ2916LB, UDQ2916LBTR, and UDN2916LBTR.
2
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2916 DUAL FULL-BRIDGE MOTOR DRIVER
UDN2916EB (PLCC)
LOGIC SUPPLY LOAD SUPPLY
5
SENSE 1
PHASE 1
OUT 1A
OUT 1B
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
VREF 1
43
42
41
RC1
E
I01
I11
R JT = 6.0C/W
1
44
40
6
5
4
3
2
1
1
VCC 39 GND
4
SUFFIX 'EB', R
JA
= 30C/W
JA
GND
7 8
VBB
PWM 1
SUFFIX 'B', R
= 40C/W
38 37 36 35 34 33
9 10 11 12 13 14 15 16 GND 17 NC
NO CONNECTION 19 21 OUT 2A 18 E2 20
3
1
2
2
32 31 30 29 NC
NO CONNECTION 22 OUT 2B 23 I02 24 I12 25
2
1
SUFFIX 'LB', R JA = 55C/W*
PWM 2
GND
0
26
27
SENSE 2
V REF 2
PHASE 2
RC 2
28
25
50
75 100 TEMPERATURE IN C
125
150
Dwg. GP-035B
Dwg. PP-006A
*Measured on a single-layer board, with 1 sq. in. of 2 oz copper area. For additional information, refer to the Allegro Web site.
UDN2916LB (SOIC)
'B' PACKAGE, CHANNEL 1 PIN NUMBERS SHOWN.
PWM CURRENT-CONTROL CIRCUITRY
VBB
24
I
02
1
PWM 2
24 23 22 2 21 20 19
VBB
LOAD SUPPLY OUT2B SENSE 2 E2 OUT 2A GROUND GROUND OUT1A E1 SENSE 1 OUT1B I 01
I 12 PHASE 2 V REF 2 RC 2 GROUND GROUND LOGIC SUPPLY RC 1 V REF 1 PHASE 1 I 11
2 3 4 5 6 7 8 9 9 V CC
2
1
OUT B
21
OUT A V REF 15 20 k 10 40 k I 0 20 I 1 17 10 k RS
23
E SENSE - RC
22
+
ONE SHOT
14
SOURCE DISABLE
18 17 16 1 15
RC CT
CC
RT
10
PWM 1
Dwg. EP-007B
11 12
1
14 13
TRUTH TABLE
PHASE OUTA H L OUTB L H H L
Dwg. PP-047
3
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1994, 2003, 2007 Allegro MicroSystems, Inc.
2916 DUAL FULL-BRIDGE MOTOR DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25C, TJ 150C, VBB = 45 V, VCC = 4.75 V to 5.25 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 = 750 mA, L = 3.0 mH Sink Driver, IOUT = +500 mA Sink Driver, IOUT = +750 mA Source Driver, IOUT = -500 mA Source Driver, IOUT = -750 mA 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) All inputs All inputs VIN = 2.4 V VIN = 0.8 V Reference Voltage Range Current Limit Threshold (at trip point) VREF VREF / VSENSE Operating I0 = I1 = 0.8 V I0 = 2.4 V, I1 = 0.8 V I0 = 0.8 V, I1 = 2.4 V Thermal Shutdown Temperature Total Logic Supply Current TJ ICC(ON) ICC(OFF) Fixed Off-Time toff I0 = I1 = 0.8 V, No Load I0 = I1 = 2.4 V, No Load RT = 56 k, CT = 820 pF 2.4 -- -- -- 1.5 9.5 13.5 25.5 -- -- -- -- -- -- <1.0 - 3.0 -- 10 15 30 170 40 10 46 -- 0.8 20 -200 7.5 10.5 16.5 34.5 -- 50 12 -- V V A A V -- -- -- C mA mA s VR = 45 V IF = 750 mA Both Bridges ON, No Load Both Bridges OFF 10 -- -- 45 -- -- -- -- -- -- -- -- -- < 1.0 <-1.0 -- 0.4 1.0 1.0 1.3 < 1.0 1.6 20 5.0 45 50 -50 -- 0.6 1.2 1.2 1.5 50 2.0 25 10 V A A V V V V V A V mA mA Symbol Test Conditions Min. Typ. Max. Units
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3
2916 DUALFULL -BRIDGE MOTORDRIVER
APPLICATIONS INFORMATION
PWM CURRENT CONTROL The UDN2916B/EB/LB dual bridges are 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 (R S ), 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: I TRIP = VREF / 10 R S 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 (t d ) is typically 2 s. After turn-o , the motor current decays, 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 t o = R T C T within the range of 20 k to 100 k and 100 pF to 1000 pF. The xed-o time should be short enough to keep the current chopping above the audible range (< 46 s) and long enough to properly regulate the current. Because only slow-decay current control is available, short o times (< 10 s) require additional e orts to ensure proper current regulation. Factors that can negatively a ect the ability to properly regulate the current when using short o times include: higher motor-supply voltage, light load, and longer than necessary blank time. 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. Loads with high distributed capaci-tances 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 C C C time delay should be used to further delay the action of the comparator. Depending on load type, many applications will not require these external components (SENSE connected to E).
PWM OUTPUT CURRENT WAVE FORM
V P HAS E
+ I OUT 0 -
I T R IP
td
to
Dwg. WM-003-1A
LOAD CURRENT PATHS
V
BB
RS
B R IDG E ON S OUR C E OF F ALL OF F
Dwg. E P -006-1
5
115 Northeast Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2916 DUAL FULL-BRIDGE MOTOR DRIVER
LOGIC CONTROL OF OUTPUT CURRENT Two logic level inputs (l 0 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. 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. Logic highs on both l 0 and l1 turn OFF all drivers to allow rapid current decay when switching phases. This helps to ensure proper motor operation at high step rates. 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 The PHASE input to each bridge determines the direction motor winding current ows. An internally generated deadtime (approximately 2 s) prevents crossover currents that can occur when switching the PHASE input. All four drivers in the bridge output can be turned OFF between steps (l 0 = l 1 2.4 V) resulting in a fast current decay through the internal output clamp and yback diodes. The fast current decay is desirable in half-step and high-speed applications. The PHASE, l 0 , and I1 inputs oat high. Varying the reference voltage (VREF ) provides continuous control of the peak load current for micro-stepping applications. 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. The UDN2916B/EB/LB output drivers are optimized for low output saturation voltages--less than 1.8 V total (source plus sink) at 500 mA. Under normal operating conditions, when combined with the excellent thermal properties of the batwing package design, this allows continuous operation of both bridges simultaneously at 500 mA.
CURRENT-CONTROL TRUTH TABLE
l0 L H L H I1 L L H H Output Current VREF /10 R S = I TRIP VREF /15 R S = 2/3 I TRIP VREF /30 R S = 1/3 I TRIP 0
These logic level inputs greatly enhance the implementation of P-controlled drive formats. During half-step operations, the l 0 and l 1 allow the P to control the motor at a constant torque between all positions in an eight-step
TYPICAL APPLICATION
STEPPER MOTOR
1 2 RS RC CC 3 4 5 6 7 8 FROM P 9 9 2
VBB
V 24 23 RS RC CC +
BB
1
22 21 20 19 18 17
FROM P
PWM 1
1
16 15 14 V
REF
10 VREF 11 12 820 pF CT
2
PWM 2
820 pF +5 V CT
56 k RT
VCC
13
56 k RT
Dwg. EP-008B1
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6
2916 DUAL FULL-BRIDGE MOTOR DRIVER
APPLICATION NOTES
measuring the tab temperature, T TAB . The junction temperature can then be approximated by using the formula:
TJ = TTAB + (2 x ILOAD x VF x RJT) ,
Current Sensing To minimize current sensing inaccuracies caused by ground trace IR drops, each current-sensing resistor should have a separate return to the ground terminal of the device. For lowvalue sense resistors, the IR drops in the PCB can be significant and should be taken into account. The use of sockets should be avoided as their contact resistance can cause variations in the effective value of R S . Generally, larger values of R S reduce the aforementioned effects but can result in excessive heating and power loss in the sense resistor. The selected value of RS should not cause the absolute maximum voltage rating of 1.5 V, for the SENSE terminal, to be exceeded. The recommended value of R S is in the range of: where V F can be chosen from the electrical specification table for the given level of I LOAD. The value for RJT is approximately 6C/W for both package styles. The power dissipation of the batwing packages can be improved 20% to 30% by adding a section of printed circuit board copper (typically 6 to 18 square centimeters) connected to the batwing terminals of the device. The thermal performance in applications that run at high load currents, high duty cycles, or both can be improved by adding external diodes from each output to ground in parallel with the internal diodes. Fast-recovery ( 200 ns) diodes should be used to minimize switching losses. Load Supply Terminal The load supply terminal, VBB, should be decoupled with an electrolytic capacitor ( 47F is recommended), placed as close to the device as is physically practical. To minimize the effect of system ground IR drops on the logic and reference input signals, the system ground should have a low-resistance return to the load supply voltage. Fixed Off-Time Selection With increasing values of t OFF, switching losses decrease, lowlevel load current regulation improves, EMI reduces, PWM frequency decreases, and ripple current increases. The value of t OFF can be chosen for optimization of these parameters. For applications where audible noise is a concern, typical values of t OFF should be chosen in the range of 15 to 35 s.
RS = 0.75 / ITRIP(max) 50% .
If desired, the reference input voltage can be filtered by placing a capacitor from REFIN to ground. The ground return for this capacitor as well as the bottom of any resistor divider used should be independent of the high-current power-ground trace to avoid changes in REFIN due to IR drops. Thermal Considerations For reliable operation, it is recommended that the maximum junction temperature be kept below 110C to 125C. The junction temperature can be measured best by attaching a thermocouple to the power tab or batwing of the device and
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7
2916 DUAL FULL-BRIDGE MOTOR DRIVER
UDN2916B
Dimensions in Inches (controlling dimensions)
24
NOTE 1
13
0.014 0.008
0.430 0.280 0.240 0.300
BSC MAX
1
0.070 0.045
6
7 1.280 1.230
0.100
BSC
12
0.005
MIN
0.210
MAX
0.015
MIN
0.150 0.115 0.022 0.014
Dwg. MA-001-25A in
Dimensions in Millimeters (for reference only)
0.355 0.204
24
NOTE 1
13
10.92 7.11 6.10 7.62
BSC MAX
1
1.77 1.15
6
7 32.51 31.24
2.54
BSC
12
0.13
MIN
5.33
MAX
0.39
MIN
3.81 2.93 0.558 0.356
Dwg. MA-001-25A mm
NOTES:1. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece. 2. Lead thickness is measured at seating plane or below. 3. Lead spacing tolerance is non-cumulative. 4. Exact body and lead configuration at vendor's option within limits shown.
8
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2916 DUAL FULL-BRIDGE MOTOR DRIVER
UDN2916EB
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
Dimensions in Inches (controlling dimensions)
39
7
40 0.020
MIN
44
1
2
6
0.656 0.650
0.180 0.165
0.695 0.685
Dwg. MA-005-44A in
28
18
29 8.10 7.39 0.533 0.331 17.65 17.40 16.662 16.510 8.10 7.39 1.27
BSC INDEX AREA
17
0.812 0.661
Dimensions in Millimeters (for reference only)
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
OTES: 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.
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9
2916 DUAL FULL-BRIDGE MOTOR DRIVER
UDN2916LB
24 13 0.0125 0.0091
0.2992 0.2914
0.419 0.394 0.050 0.016
Dimensions in Inches (for reference only)
0.020 0.013
1
2
3
0.6141 0.5985
0.050
BSC NOTE 1 NOTE 3
0 TO 8
0.0926 0.1043 0.0040 MIN.
24
Dwg. MA-008-25A in
0.32 0.23
7.60 7.40
10.65 10.00 1.27 0.40
Dimensions in Millimeters (controlling dimensions)
0.51 0.33
1
2
3
15.60 15.20
1.27
BSC NOTE 1 NOTE 3
0 TO 8
2.65 2.35 0.10 MIN.
Dwg. MA-008-25A mm
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.
NOTES:1. Webbed lead frame. Leads indicated are internally one piece. 2. Lead spacing tolerance is non-cumulative. 3. Exact body and lead configuration at vendor's option within limits shown.
10
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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