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Allegro MicroSystems - HIGH-CURRENT HALF-BRIDGE PRINTHEAD/MOTOR DRIVER.WITH INTERNAL CURRENT SENSING AND CONTROL

Numéro de référence 2961
Description HIGH-CURRENT HALF-BRIDGE PRINTHEAD/MOTOR DRIVER.WITH INTERNAL CURRENT SENSING AND CONTROL
Fabricant Allegro MicroSystems 
Logo Allegro MicroSystems 





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2961 fiche technique
2961
HIGH-CURRENT
HALF-BRIDGE
2961
PRINTHEAD/MOTOR DRIVER
HIGH-CURRENT HALF-BRIDGE
PRINTHEAD/MOTOR DRIVER—WITH INTERNAL
CURRENT SENSING AND CONTROL
UDN2961B
VREF 1
IN 2
INPUT 3
GROUND 4
GROUND 5
ENABLE 6
RC 7
MODE 8
VBB 16 SINK OUT
15 EMITTER
CURRENT-
CONTROL
LOGIC
14 NC
13 GROUND
VBB 12 GROUND
11 LOAD SUPPLY
10 SOURCE OUT
VCC 9 LOGIC SUPPLY
Dwg. PP-035
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VBB . . . . . . . . . . . . . . 45 V
Output Current, IOUT (continuous) . ±3.4 A
(tw 20 µs, 10% duty cycle) . . ±4.0 A
Logic Supply Voltage, VCC . . . . . . . . . 7.0 V
Input Voltage Range,
VIN . . . . . . . . . . . . . . . -0.3 V to +7.0 V
Package Power Dissipation,
PD . . . . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range,
TA . . . . . . . . . . . . . . . . -20°C to +85°C
Junction Temperature, TJ . . . . . . . +150°C*
Storage Temperature Range,
TS . . . . . . . . . . . . . . . -55°C to +150°C
Output current rating may be restricted to a value
determined by system concerns and factors.
These include: system duty cycle and timing,
ambient temperature, and use of any heatsinking
and/or forced cooling. For reliable operation, the
specified maximum junction temperature should
not be exceeded.
* Fault conditions that produce excessive junction
temperature will activate device thermal shutdown
circuitry. These conditions can be tolerated, but
should be avoided.
The UDN2961B and UDN2961W are 3.4 A half bridges designed
specifically for driving solenoid printheads, stepper motors, and dc
motors. The UDN2961B/W consists of a power source driver output,
a power sink driver output, a flyback recovery diode, internal current
sensing circuitry, and a user-selectable fixed off-time chopper circuit.
The output drivers are capable of sustaining 45 V with continuous
currents of ±3.4 A and peak transient currents of ±4 A permitted. The
outputs have been optimized for a low output saturation voltage
(typically 2.6 V total source plus sink drops at 3.4 A).
For output current control, load current is sensed internally and
limited by chopping the output driver(s) in a user-selectable fixed off-
time PWM mode. The maximum output current is determined by the
user’s selection of a reference voltage. The MODE pin determines
whether the current control circuitry will chop in a slow current-decay
mode (only the source driver switching) or in a fast current-decay
mode (source and sink switching). A user-selectable blanking window
prevents false triggering of the current control circuitry during
chopping.
The UDN2961B is supplied in a 16-pin dual in-line plastic batwing
package with a copper lead-frame and heat sinkable tabs for improved
power dissipation capabilities. For higher power dissipation require-
ments, the UDN2961W is supplied in a 12-pin single in-line power tab
package.
FEATURES
s 3.4 A, 45 V Source and Sink Drivers
s Internal Current Sensing
s User-Selectable Fixed Off-Time PWM Current Control
s Internal Flyback Diode
s Low Output Saturation Voltage
s Chip Enable
s Fast or Slow Current-Decay Modes
s Programmable Blanking Window
s Internal Thermal Shutdown Circuitry
Always order by complete part number:
Part Number Package
UDN2961B 16-Pin DIP
UDN2961W 12-Pin Power-Tab SIP

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