M.S. KENNEDY CORPORATION 4707 DEY ROAD LIVERPOOL, NY 13088 PHONE: (315) 701-6751 | FAX: (315) 701-6752 MSK Web Site: http://www.mskennedy.com/ Application Note 035 MSK4323 Evaluation Board User’s Guide By John Douglas and Bob Giacobbi, MS Kennedy Corp.; Revised 4/2/2014 Introduction The MSK4323 is a 20 Amp, High Temp Smart 3 Phase Bridge with a 100 volt rating on the output switches. The output switches are power MOSFETs with intrinsic fast-recovery diodes for the free-wheeling currents of motor drives. This high temp smart power motor drive module is compatible with 5V CMOS or TTL logic levels. The internal circuitry prevents simultaneous turn-on of the in-line half bridge transistors with a built-in 2μS dead time to prevent shoot-through. Under voltage lockout shuts down the bridge when the supply voltage gets to a point of incomplete turn-on of the output switches. The internal high-side boot strap power supply derived from the +15 volt supply completely eliminates the need for 3 floating independent power supplies for the high-side drive. The circuit has been tested to temperatures above 175°C and uses special high temperature construction processes. AN035 1 Setup Use the standard 4mm banana jacks to interface with the assembly to connect to your power supply and motor assembly. A Logic Ground input is provided for input control reference. For further details please reference the MSK4323 data sheet. MSK4323 Evaluation Board Schematic AN035 2 PCB Artwork Top Layout Bottom Layout AN035 3 Design Details Device Block Diagram Additional ISENSE and ITRIP Configuration Removable jumpers J1 and J2 along with sockets R2, R3 and C12 allow the user to adjust the overcurrent parameters. The Board as shipped has J1 and J2 installed which disables overcurrent protection. If overcurrent protection is desired it requires the removal of J1 and J2 and the installation of R2, R3 and C12. It is recommended that the R2 resistor be noninductive, the socket is configured for an Isotek PBV series precision resistor such as PBVR050. Switching noise spikes will invariably be found at the ISENSE pin. The noise spikes could trip the current limit threshold which is only 500mV. R3 and C12 should be adjusted so as to reduce the switching noise well below 500mV to prevent false current limiting. The sum of the DC level plus the noise peak will determine the current limiting value. As in most switching circuits it may be difficult to determine the true noise amplitude without careful attention to grounding of the oscilloscope probe. Use the shortest possible ground lead for the probe and connect exactly at the GND pin of the amplifier. Suggested starting values are C12=0.01μF, R3=5K. The required value of R2 in voltage mode may be calculated by: R2=0.5V/ILIMIT where R2 is the required resistor value and ILIMIT is the maximum desired current. AN035 4 Bill of Materials Ref Des/Qty Value R1 4.99K R2 Not Populated R3 Not Populated R4 Manufacturer P/N Panasonic ERJ-6ENF4991V Isotek PBV Series 10K Yageo RSF200 C1-C4 0.1µF Kemet 1206C104K2RACTU C5-C7 22 µF Panasonic C8 460 µF Vishay C9-C11 1.0 µF C12 Not Populated C13 6.8 µF Panasonic EEEFC1V6R8R C14 100µF Panasonic ECQE(F) D1 LED VCC Optoelectronics D2, D3 1N4003 Fairchild Semiconductor 1N4003 14 BANANA JACKS EMERSON/JOHNSON 108-09XX-001 48 .015/.025 dia. pin recept. MILL MAX 0677-0-15-01-30-27-10-0 16 .022/.032 dia. pin recept. MAX 0295-0-15-01-06-27-10-0 4 7/8”, #4, STANDOFFS 4 3/8”, #4, SCREWS 1 MSK 4323 MSK MSK 1 MSK 4323 EVAL BOARD MSK AN035 TDK Corporation EEFP1V220AR 53D461F200JP6 C2012X7R1H105K125AB VAO-5LAE2 5