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What is UDN2917?

This electronic component, produced by the manufacturer "Allegro", performs the same function as "DUAL FULL-BRIDGE PWM MOTOR DRIVER".


UDN2917 Datasheet PDF - Allegro

Part Number UDN2917
Description DUAL FULL-BRIDGE PWM MOTOR DRIVER
Manufacturers Allegro 
Logo Allegro Logo 


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2 917
GND 7
8
9
10
11
12
13
14
15
16
GND 17
1
2
PWM 1
PWM 2
39 GND
38
37
36
35
34
33
32
31
30
29 GND
Dwg. PP-021
Dwg. PP-021
ABSOLUTE MAXIMUM RATINGS
at TJ +150°C
Motor Supply Voltage, VBB .................... 45 V
Output Current, IOUT (tw 20 µs) ..... ±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 .................................. -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.
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 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.
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
Always order by complete part number: UDN2917EB .

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UDN2917 equivalent
2917
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
CURRENT-CONTROL
TRUTH TABLE
I0 I1 Output Current
L L VREF/10 RS = ITRIP
H L VREF /15 RS = 2/3 ITRIP
L H VREF /30 RS = 1/3 ITRIP
HH
0
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 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 I0 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 holdconditions
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 µF) 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 (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 (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 +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.
www.allegromicro.com


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for UDN2917 electronic component.


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Featured Datasheets

Part NumberDescriptionMFRS
UDN2916The function is DUAL FULL-BRIDGE PWM MOTOR DRIVER. AllegroAllegro
UDN2916AThe function is STEPPER MOTOR DRIVER. ST MicroelectronicsST Microelectronics
UDN2916BThe function is DUAL FULL-BRIDGE PWM MOTOR DRIVER. SpragueSprague

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