2961

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 offtime 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 requirements, the UDN2961W is supplied in a 12-pin single in-line power tab package. Data Sheet 29318.1...