2961
HIGH-CURRENT
HALF-BRIDGE
PRINTHEAD/MOTOR DRIVER
2961
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.
Data Sheet
29318.16*
HIGH-CURRENT HALF-BRIDGE
PRINTHEAD/MOTOR DRIVER—WITH INTERNAL
CURRENT SENSING AND CONTROL
UDN2961B
VREF
IN
INPUT
GROUND
GROUND
ENABLE
RC
MODE
1
2
3
4
5
6
7
8
V
CC
CURRENT-
CONTROL
LOGIC
V
BB
16
15
14
13
12
11
10
9
SINK OUT
EMITTER
NC
GROUND
GROUND
LOAD SUPPLY
SOURCE OUT
LOGIC SUPPLY
V
BB
Dwg. PP-035
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
BB
. . . . . . . . . . . . . .
45 V
Output Current, I
OUT
(continuous) .
±3.4
A
(t
w
≤
20
µs,
10% duty cycle) . .
±4.0
A
Logic Supply Voltage, V
CC
. . . . . . . . .
7.0 V
Input Voltage Range,
V
IN
. . . . . . . . . . . . . . .
-0.3 V to +7.0 V
Package Power Dissipation,
P
D
. . . . . . . . . . . . . . . . . . .
See Graph
Operating Temperature Range,
T
A
. . . . . . . . . . . . . . . .
-20
°
C to +85
°
C
Junction Temperature, T
J
. . . . . . .
+150
°
C*
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . . -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.
FEATURES
s
s
s
s
s
s
s
s
s
3.4 A, 45 V Source and Sink Drivers
Internal Current Sensing
User-Selectable Fixed Off-Time PWM Current Control
Internal Flyback Diode
Low Output Saturation Voltage
Chip Enable
Fast or Slow Current-Decay Modes
Programmable Blanking Window
Internal Thermal Shutdown Circuitry
Always order by complete part number:
Part Number Package
UDN2961B
UDN2961W
16-Pin DIP
12-Pin Power-Tab SIP
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
