A3951SB Full-Bridge PWM Motor Driver

Producto nº: AD42652
Tu precio: US$6,90
No. de artículos en existencia: 6
Disponibilidad: En existencia
A3951SB Full-Bridge PWM Motor Driver

Description:

Designed for bidirectional pulse-width modulated current control of inductive loads, the A3951SB and A3951SW are capable of continuous output currents to ±2 A and operating voltages to 50 V. Internal fixed off-time PWM current-control circuitry can be used to regulate the maximum load current to a desired value. The peak load current limit is set by the user’s selection of an input reference voltage and external sensing resistor. The fixed off-time pulse duration is set by a userselected external RC timing network. Internal circuit protection includes thermal shutdown with hysteresis, transient suppression diodes, and crossover-current protection. Special power-up sequencing is not required. The A3951SB and A3951SW are improved replacements for the UDN2953B and UDN2954W, respectively. For new system designs, the A3952SB/SEB/SLB/SW are recommended. With the ENABLE input held low, the PHASE input controls load current polarity by selecting the appropriate source and sink driver pair. A user-selectable blanking window prevents false triggering of the PWM current control circuitry. With the ENABLE input held high, all output drivers are disabled. When a logic low is applied to the BRAKE input, the braking function is enabled. This overrides ENABLE and PHASE to turn off both source drivers and turn on both sink drivers. The brake function can be safely used to dynamically brake brush dc motors. The A3951SB is supplied in a 16-pin dual in-line plastic package with copper heat-sink contact tabs. The lead configuration enables easy attachment of a heat sink while fitting a standard printed wiring board layout. The A3951SW, for higher package power dissipation requirements, is supplied in a 12-pin single in-line power-tab package. In either package style, the batwing/power tab is at ground potential and needs no isolation.

Features:

- ±2 A Continuous Output Current Rating

- 50 V Output Voltage Rating

- Internal PWM Current Control

- Internal Transient Suppression Diodes

- Under-Voltage Lockout

- Internal Thermal Shutdown Circuitry

- Crossover-Current Protection

- Default Brake Current Limit

Para más detalles ver hoja de datos: A3951SB Datasheet.pdf (178531)

 

Designed for bidirectional pulse-width modulated current control of
inductive loads, the A3951SB and A3951SW are capable of continuous
output currents to ±2 A and operating voltages to 50 V. Internal fixed
off-time PWM current-control circuitry can be used to regulate the
maximum load current to a desired value. The peak load current limit is
set by the user’s selection of an input reference voltage and external
sensing resistor. The fixed off-time pulse duration is set by a userselected
external RC timing network. Internal circuit protection includes
thermal shutdown with hysteresis, transient suppression diodes, and
crossover-current protection. Special power-up sequencing is not
required. The A3951SB and A3951SW are improved replacements for
the UDN2953B and UDN2954W, respectively. For new system designs,
the A3952SB/SEB/SLB/SW are recommended.
With the ENABLE input held low, the PHASE input controls load
current polarity by selecting the appropriate source and sink driver pair.
A user-selectable blanking window prevents false triggering of the PWM
current control circuitry. With the ENABLE input held high, all output
drivers are disabled.
When a logic low is applied to the BRAKE input, the braking
function is enabled. This overrides ENABLE and PHASE to turn off
both source drivers and turn on both sink drivers. The brake function
can be safely used to dynamically brake brush dc motors.
The A3951SB is supplied in a 16-pin dual in-line plastic package
with copper heat-sink contact tabs. The lead configuration enables
easy attachment of a heat sink while fitting a standard printed wiring
board layout. The A3951SW, for higher package power dissipation
requirements, is supplied in a 12-pin single in-line power-tab package.
In either package style, the batwing/power tab is at ground potential
and needs no isolation.
FEATURES
±2 A Continuous Output Current Rating
50 V Output Voltage Rating
Internal PWM Current Control
Internal Transient Suppression Diodes
Under-Voltage Lockout
Internal Thermal Shutdown Circuitry
Crossover-Current Protection
Default Brake Current Limit

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