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PDF 2961 Data sheet ( Hoja de datos )
| Número de pieza | 2961 | |
| Descripción | HIGH-CURRENT HALF-BRIDGE PRINTHEAD/MOTOR DRIVER.WITH INTERNAL CURRENT SENSING AND CONTROL | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de 2961 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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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
1 page  
2961
HIGH-CURRENT
HALF-BRIDGE
PRINTHEAD/MOTOR DRIVER
A logic high on the MODE pin sets the
current-control circuitry into the fast-decay
mode. When the peak current threshold is
detected, the flip-flop is reset and both the
source driver and the sink driver turn OFF.
Load current decays quickly through the
external ground clamp diode, the load, and
the internal flyback diode. In the fast-
decay mode, the OFF time period is one-
half the time that is set by the external RC
network for the slow-decay mode:
tOFF =
RC
2
The amount of ripple current, when
chopping in the fast-decay mode, is
considerably higher than when chopping in
the slow-decay mode.
The frequency of the PWM current
control is determined by the time required
for the load current to reach the set peak
threshold (a function of the load character-
istics and VBB) plus the OFF time of the
switching driver(s) (set by the external RC
components).
To prevent false resetting of the flip-
flop, due to switching transients and noise,
a blanking time for the comparator can be
set by the user where tB ≈ 3600 x C in the
slow-decay mode or tB ≈ 2400 x C in the
fast-decay mode. For C between 100 pF
and 1000 pF, tB is in µs.
POWER CONSIDERATIONS
The UDN2961B/W outputs are opti-
mized for low power dissipation. The sink
driver has a maximum saturation voltage
drop of only 1.4 V at 3.4 A, while the
source driver has a 2.2 V drop at -3.4 A.
Device power dissipation is minimized in
the slow-decay mode, as the chopping
driver (the source driver) is ON for less
than 50% of the chop period. When the
source driver is OFF during a chop cycle,
power is dissipated on chip only by the sink
driver; the rest of the power is dissipated
through the external ground clamp diode.
In the fast-decay mode, the ON time of the
chopping drivers (both the source driver
VREF
INPUT
ENABLE
2940 Ω
±1%
MODE
1 VBB 16
2 15
3
CURRENT-
CONTROL
4 LOGIC
14
13
5 VBB 12
6 11
7 10
8 VCC 9
VBB
47 µF
INPUT
C
1
2
3
4
5
6
C
7
8
R +5 V
VBB 16
15
CURRENT-
CONTROL
LOGIC
14
13
VBB 12
11
47 µF
VBB
10
VCC 9
+5 V
R Dwg. EP-038A
and the sink driver) may be greater than 50%, and the power dissipa-
tion will be greater.
GENERAL
A logic low on the ENABLE pin prevents the source driver and the
sink driver from turning ON, regardless of the state of the INPUT pin or
the supply voltages. With the ENABLE pin high, a logic low on the
INPUT pin turns ON the output drivers.
To protect against inductive load voltage transients, an external
ground clamp diode is required. A fast-recovery diode is recom-
mended to reduce power dissipation in the UDN2961B/W. The blank-
ing time prevents false triggering of the current sense comparator,
which can be caused by the recovery current spike of the ground
clamp diode when the chopping source driver turns ON.
5 Page 
2961
HIGH-CURRENT
HALF-BRIDGE
PRINTHEAD/MOTOR DRIVER
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet 2961.PDF ] | |
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