UCN-4202A

The UCN-4202A has the following features including 600 mA Output Current;Full-Step or Double-Step Operation;Single-Input Direction Control;Power-On Reset;Internal Transient Suppression;Schmitt Trigger Inputs.

DESIGNED TO DRIVE permanent-magnet stepper motors UCN-4202A with current ratings of up to 500 mA, theseintegrated circuits employ afull-step,double-pulse drive scheme that allows use of up to 90 percent of available motor torque. The two devices differ only in outputvoltage ratings:Type UCN-4202A has a 20 V breakdown-voltage rating and a 15 V sustaining voltage rating.Both drivers are bipolar I2L designs containing approximately 100 logic gates, TTL-compatible input/output circuitry, and 600 mA outputs with internal transient suppressors. The devices operate with a minimum of external components.The four-phase stepper-motor load is controlled by step-logic functions.The step logic is activated on the positive-going edge, which in turn activates one of the four current-sink outputs. DIRECTION CONTROL determines the sequence of states (A-B-C-D or A-D-C-B).In the full-step mode, the MONOSTABLE RC timing pin is tied to Vcc, making states B and D stationary. A separate inputpulse is required to move through each of the four output states.

The products UCN-4202A described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for any use that includes fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for any use where chance of failure is intolerable (i.e., submersible repeater and artificial satellite).Full-step operation is the most commonly used drive technique. The devices are capable of unipolar drive without external active devices, either in a full-step mode (pin 11,Monostable RC, tied high),or in a double-step mode (pin 11 connected to RC timing). The double-step mode provides improved torque characteristics, while the specified angular increment is doubled.