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MSK4422S Datasheet(PDF) 4 Page - M.S. Kennedy Corporation |
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MSK4422S Datasheet(HTML) 4 Page - M.S. Kennedy Corporation |
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4 / 6 page  PROTECTION All logic inputs use a 300nS filter. A pulse width below this will get ignored. VCC voltage below the cutoff level of 8.65 volts will reset all switch outputs off and ignore subsequent logic inputs until VCC is restored. Undervoltage lockout of the internal drivers for the high-side switches also occurs at 8.65 volts, but will not flag with the FAULT output. This may occur if the high-side output gets switched without switching the low-side. The internal boot strap powersupply for the high-side switch will sag too low for adequate switch- ing. The boot strap supply depends on PWMing of the low-side switches for proper operation. Switching a low-side logic input while the correspond- ing phase high-side logic input is activated will turn off both switches. The opposite condition is also true. This is cross-conduction lockout and will occur any time low and high-side inputs for a phase are acti- vated at the same time. A 2µS deadtime is automatically inserted between high and low-side output switching to allow complete turn-off of each switch so no overlap will occur. An overcurrent condition detected by the ITRIP pin will shut down all output switches until the overcurrent condition is removed and all three low-side logic in- puts are held high for 10µS, then normal operation will resume. ITRIP has a 100nS leading edge blanking time after switching to ignore any switching current transients. TYPICAL OPERATION 4 APPLICATION NOTES MSK 4422 PIN DESCRIPTION VCC - Is the low voltage supply for all the internal logic and drivers. A 0.1 µF ceramic capacitor in parallel with a 10µF tantalum capacitor is recommended bypassing for the VCC-VSS pins. VSS - Is the low voltage supply return pin and the input logic return reference. All logic input and logic output is referenced to this pin. This pin can vary ±5V from the COM power return pin without affecting any of the logic functions. AØHIN, BØHIN, CØHIN - Are low active logic inputs for signalling the corresponding phase high-side switch to turn on. The input levels are 5V CMOS or TTL compat- ible. AØLIN, BØLIN, CØLIN - Are low active inputs for sig- nalling the corresponding phase low-side switch to turn on. The input levels are 5V CMOS or TTL compatible. FAULT - Is an open drain logic output pin that gets enabled any time the VCC level goes below the cutoff point, or an overcurrent condition occurs. Bringing VCC back to normal levels will reset FAULT. Removing the overcurrent condition and allowing the low-side logic inputs to remain high(off) for 10µS will restore opera- tion. ITRIP - Is an analog input pin for sensing current flow- ing from the COM pin through a sense resistor to the high power ground. A 0.5 volt level at this pin with respect to VSS will signal an overcurrent condition, enable the FAULT pin and shut down all output switch- ing. Bringing the voltage below this point (100 mV hysteresis) will remove the FAULT output and leaving the low-side logic inputs simultaneously high (de-acti- vated) for 10µS will restore normal operation. V+ - Is the high voltage positive rail for the bridge. Proper bypassing to VSS with sufficient capacitance to suppress any voltage transients and to ensure re- moving any drooping during switching, should be done as close to the pins on the hybrid as possible. COM - Is the return side of the bridge. A sense resistor can be connected between this point and VSS, which is the high voltage negative rail. COM can float above and below the VSS pin up to 5 volts and proper opera- tion will be maintained. Precautions should be taken so as to not allow this voltage to get over ±5 volts under any conditions. AØ, BØ, CØ - Are the pins connecting the 3 phase bridge switch outputs. - - - - - - - Rev. B 4/05 |
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