●Overview
●The STK672-430A-E is a hybrid IC for use as a unipolar, 2-phase stepping motor driver with PWM current control.
●Features
●• Built-in overcurrent detection function (output current OFF).
●• Built-in overheat detection function (output current OFF).
●• If either over-current or overheat detection function is activated, the FAULT1 signal (active low) is output.
● The FAULT2 signal is used to output the result of activation of protection circuit detection at 2 levels.
●• Built-in power on reset function.
●• A micro-step sine wave-driven driver can be activated merely by inputting an external clock.
●• External pins can be used to select 2, 1-2 (including pseudo-micro), W1-2, 2 W1-2, or 4W1-2 excitation.
●• The switch timing of the 4-phase distributor can be switched by setting an external pin (MODE3) to detect either the rise and fall, or rise only, of CLOCK input.
●• Phase is maintained even when the excitation mode is switched. Rotational direction switching function.
●• Supports schmitt input for 2.5V high level input.
●• Incorporating a current detection resistor (0.152Ω: resistor tolerance ±2%), motor current can be set using two external resistors.
●• The ENABLE pin can be used to cut output current while maintaining the excitation mode.
●• With a wide current setting range, power consumption can be reduced during standby.
●• No motor sound is generated during hold mode due to external excitation current control.
●• A external excitation system is used for PWM operations. Fixed current control for shifting the phase of Ach/Bch is used for the PWM phase.
●Applications
●• Office photocopiers, printers, etc.
