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MSK4357ES Datasheet(PDF) 3 Page - M.S. Kennedy Corporation |
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MSK4357ES Datasheet(HTML) 3 Page - M.S. Kennedy Corporation |
3 / 6 page VCC - is the low voltage supply for all the internal logic and drivers. A 0.1uF ceramic capacitor in parallel with a 10uF 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 AV-,BV-,CV-/ ISENSE power return pin without affecting any of the logic functions. AØHIN, BØHIN, CØHIN - are low active logic inputs for signal- ling the corresponding phase high-side switch to turn on. The input levels are 5V CMOS or TTL compatible. Typical propa- gation delays are around 600nS. AØLIN, BØLIN, CØLIN - are low active inputs for signalling the corresponding phase low-side switch to turn on. The in- put levels are 5V CMOS or TTL compatible. Typical propaga- tion delays are around 600nS. ITRIP - is an analog input pin for sensing current flowing from the AV-,BV-,CV-/ISENSE pin through a sense resistor to the high power ground. A 0.485 volt level at this pin with re- spect to VSS will signal an overcurrent condition and shut down all output switching. Bringing the voltage below this point (100 mV hysteresis) will remove the shutdown condi- tion, and leaving the low-side logic inputs simultaneously high (de-activated) for 10uS will restore normal operation. AV+,BV+,CV+ - are the connections from the tops of the three half bridges to the high voltage positive rail. Connec- tions must be made individually from each pin to the rail, with enough current-handling capability for the load. Proper power supply bypassing must be connected to these three pins and the Vss connections for proper filtering. This bypassing must be done as close to the hybrid as possible. AV-,BV- - are the connections from the bottoms of the AØ and BØ half bridges to the return of the high voltage negative rail. These pins should be tied to the CV-/ISENSE with as short a connection as possible. CV-/ISENSE - is the connection from the bottom of the CØ half bridge to the return of the high voltage negative rail. There should be a connection to AV- and BV- here. If there is cur- rent sensing, then a sense resistor should go between this point and the return of the high voltage supply. If no sensing is desired, then this point should connect to Vss, the negative rail of the high voltage supply and any high voltage bypass capacitance. AØ, BØ, CØ - are the pins connecting the 3 phase bridge switch outputs. APPLICATION NOTES PROTECTION MSK4357 PIN DESCRIPTION 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. This may occur if the high-side output gets switched at greater than 25 kHZ with- out switching the low-side. The internal power supply for the high-side switch will sag too low for adequate switching. Ei- ther slow down the PWM rate or PWM the low-side switches instead. Switching a low-side logic input while the corresponding 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 activated at the same time. A 2uS 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 inputs are held high for 10uS, then normal operation will resume. ITRIP has a 400nS leading edge blanking time after switching to ignore any switching current transients. TYPICAL OPERATION - - - - - - - Rev. I 6/04 3 EXAMPLE: FOR 20 AMP LIMIT: R-SENSE = 0.050 OHMS R-SENSE VOLT = 1 VOLT R1 = 51.5 OHMS R2 = 48.5 OHMS FIGURE 1 GROUNDING, BYPASSING, CURRENT SENSE |
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