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Part: 2916
Category:
Power Management
-> Motor Controller/Drivers
Description:
Company: Allegro Micro Systems, Inc.
Datasheet: Download 2916 datasheet File size : 409 kB
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Datasheet text preview:
2916
UDN2916B (DIP)
OUT 1A OUT 2A E2 SENSE 2 OUT 2B GROUND GROUND I
02
DUAL FULL-BRIDGE PWM MOTOR DRIVER
VBB LOAD SUPPLY E1 SENSE 1 OUT 1B I 01 GROUND GROUND I 11 PHASE 1 V REF 1 RC 1 LOGIC SUPPLY
1 2 3 4 5 6 7 8 2
24 23
1
22 21 20 19 18 17
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/EB/LB are available for operation from -40°C to +85°C. To order, change the prefix from 'UDN' to 'UDQ'. These devices are also available on special order for operation to +105°C.
Data Sheet 29319.20C*
PWM 1
I 12 PHASE 2 V REF 2 RC 2
9 9 10 11 12 2
PWM 2
1
16 15 14
V CC
13
Dwg. PP-005
ABSOLUTE MAXIMUM RATINGS
at TJ 150°C
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 +7.0 V Output Emitter Voltage, VE .......... 1.5 V Package Power Dissipation, PD ........ See Graph Operating Temperature Range, TA ......... -20°C to +85°C Storage Temperature Range, TS ....... -55°C to +150°C
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.
FEATURES
s s s s s s s 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
Always order by complete part number: Part Number Package UDN2916B 24-Pin DIP UDN2916EB 44-Lead PLCC UDN2916LB 24-Lead SOIC
2916 DUAL FULL-BRIDGE MOTOR DRIVER
UDN2916EB (PLCC)
LOGIC SUPPLY LOAD SUPPLY
SENSE 1
PHASE 1
OUT 1A
OUT 1B
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
VREF 1
5
RJT = 6.0°C/W
43
42
41
RC1
E
I01
I11
1
44
1
GND 7 8
VBB
VCC 39 GND
40
6
5
4
3
2
1
4
SUFFIX 'EB', R
PWM 1
JA
= 30°C/W
JA
38 37 36 35 34 33
SUFFIX 'B', R
= 40°C/W
9 10 11 12 13 14 15 16 GND 17 NC
NO CONNECTION 19 21 OUT 2A 18 E2 20
1
3
2
2
32 31 30 29 NC
NO CONNECTION 22 OUT 2B 23 I02 24 I12 25
1
SUFFIX 'LB', R JA = 77°C/W
PWM 2
GND
2
26 27 28 V REF 2
0 25 50 75 100 TEMPERATURE IN ° C 125 150
Dwg. GP-035B
SENSE 2
PHASE 2
RC 2
Dwg. PP-006A
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 OUT 2B SENSE 2 E2 OUT 2A GROUND
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
OUT B
1 21
OUT A V REF 15 20 k ÷10 40 k 10 k I 0 20 I 1 17 R S
23
E SENSE
22
+
ONE SHOT
14
SOURCE DISABLE
18 17 16 1 15
GROUND OUT 1A E1 SENSE 1
RC C C R T
RC
C
T
10
PWM 1
Dwg. EP-007B
11 12
1
14 13
OUT 1B I 01
TRUTH TABLE
PHASE OUTA H L OUTB L H H L
Dwg. PP-047
2
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 1994, 2003 Allegro MicroSystems, Inc.
2916 DUAL FULL-BRIDGE MOTOR DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25°C, TJ 150°C, 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) I BB(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) I0 = I1 = 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 40 10 -- 0.8 20 -200 7.5 10.5 16.5 34.5 -- 50 12 V V µA µA V -- -- -- °C mA mA 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 µA µA V V V V V µA V mA mA Symbol Test Conditions Min. Typ. Max. Units
www.allegromicro.com
3
2916 DUAL FULL-BRIDGE MOTOR DRIVER
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 (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 µs. After turn-off, 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 toff = RTCT within the range of 20 k to 100 k and 100 pF to 1000 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. Loads with high distributed capacitances may result in high turn-ON 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 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).
I TRIP
PWM OUTPUT CURRENT WAVE FORM
V PHASE
+ I OUT 0
td
t off
Dwg. WM-003-1A
LOAD CURRENT PATHS
V BB
RS
BRIDGE ON SOURCE OFF ALL OFF
Dwg. EP-006-1
4
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2916 DUAL FULL-BRIDGE MOTOR DRIVER
LOGIC CONTROL OF OUTPUT CURRENT Two logic level inputs (l0 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 l0 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 flows. An internally generated deadtime (approximately 2 µs) prevents crossover currents that can occur when switching the PHASE input. All four drivers in the bridge output can be turned OFF between steps (l0 = l1 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. The PHASE, l0 ,and I1 inputs float 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 +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. 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 RS = ITRIP VREF/15 RS = 2/3 ITRIP VREF/ 30 RS = 1/3 ITRIP 0
These logic level inputs greatly enhance the implementation of µP-controlled drive formats. During half-step operations, the l0 and l1 allow the µP to control the motor at a constant torque between all positions in an eight-step
TYPICAL APPLICATION
STEPPER MOTOR
V 1 2 RS 3 RC CC 4 5 6 7 8 FROM µP 9 9 10 V 11 12 RT CT V CC 2 2 1 VBB 24 RS 23 RC 22 CC 21 20 19 18 17 FROM µP +
BB
PWM 1
1 16 15 14 13 +5 V CT RT V
REF
REF
PWM 2
Dwg. EP-008B
www.allegromicro.com
5
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