STK621-041A-E Sanyo Semiconductor Corporation, STK621-041A-E Datasheet - Page 9

• Manufacturer Part Number: STK621-041A-E
• Description: Air Conditioner Three-phase Compressor Motor Driver Imst Inverter Power Hybrid Ic
• Manufacturer: Sanyo Semiconductor Corporation

(7) ISO pin
Protection Circuits
The STK621-041 and STK621-041A-E have the following built-in protection functions.
(1) Thermal protection (TSD)
(2) Overcurrent protection (ISD)
(3) V DD under voltage protection (VDUV)
(4) VBS under voltage protection (VBSUV)
(5) Arm short circuit input protection function
(6) Latch reset
When the upper-side control supply voltage VBS drops below the prescribed voltage (10.5V, typ.), the output of that
channel is cut off and the channel is latched until the corresponding input signal goes OFF. (The channel is
automatically reset when the input signal goes OFF.)
This is the current monitor pin. This pin outputs the positive direction current flowing to the shunt resistor inserted
into the - (minus) pin line as a voltage signal. (Negative direction current is not output.) Note that overcurrent
protection is disabled when this pin is shorted with V SS . When connecting an external circuit to this pin, the
external circuit impedance should be 5.6kΩ or more.
When the HIC internal board temperature rises to the set temperature or higher, the thermal protection circuit
operates to cut off all six device outputs and latch the FAULT pin Low. The TSD temperature is prescribed by the
heat sink board temperature when the FAULT pin inverts in the condition with the HIC externally warmed.
This function detects the bus line current using a shunt resistor provided on the minus pin side. When the set current
is exceeded, all six device outputs are cut off and the FAULT pin is latched Low. A dead zone is provided so that
the circuit does not respond to pulse currents with a width less than several µs in order to prevent malfunction due to
the diode recovery current or noise. Therefore, note that the overcurrent protection circuit may not operate when
large pulse currents shorter than that width flow repeatedly.
When the upper and lower channel ON signals are input at the same time, this status is judged by the internal logic
circuit and both gate signal outputs are turned OFF to prevent an arm short circuit. Operation returns to normal when
either of the signals goes OFF.
When V DD drops below the prescribed voltage (10.5V, typ.), all six device outputs are cut off and the FAULT pin
is latched Low. Operation returns to normal when the voltage recovers.
The latch states established by (2) and (3) above are canceled when all six inputs are OFF (10µs or more).
STK621-041,621-041A-E
No. A0483-9/13