2961

Features:

  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


Pinout




Specifications

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


Description

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 theuser'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.