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MSK4362HU Datasheet(PDF) 4 Page - M.S. Kennedy Corporation |
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MSK4362HU Datasheet(HTML) 4 Page - M.S. Kennedy Corporation |
4 / 8 page BRAKE - is a pin for commanding the output bridge into a motor BRAKE mode. When pulled low, nor- mal operation commences. When pulled high, the 3 high side bridge switches turn off and the 3 low side bridge switches turn on, causing rapid decel- eration of the motor and will cease motor operation until pulled high again. Logic levels for this input are TTL compatible. It is internally pulled high. DIS - is a pin for externally disabling the output bridge. A TTL logic low will enable the bridge and a TTL logic high will disable it. It is internally pulled up by a 100 µAmp pullup. 60/120- is a pin for selecting the orientation of the commutation scheme of the motor. A high state will produce 60/300 degree commutation, whereas a low state will produce 120/240 degree commuta- tion. Logic levels for this input are TTL compatible. It is internally pulled high. APPLICATION NOTES CONTINUED 4 VOLTAGE REGULATOR POWER DISSIPATION - To figure volt- age regulator power dissipation and junction temperature, use the following as an example: Given: V+ = 28V, MSK 4362 +15V IQ = 85mA, -15V IQ = 40mA. External Loads: +15V = 25 mA, -15V = 25 mA -15V Converter Efficiency = 50% PDISS due to +15V IQ, 85 mA x 13V = 1.11 W PDISS due to -15V IQ, (40 mA / 0.5) x 13V = 1.04 W PDISS due to +15V Ext load, 25 mA x 13V = 325 mW PDISS due to -15V Ext load, (25 mA / 0.5) x 13V = 650 mW PDISS Total = 1.11 W + 1.04 W + 325 mW+650 mW=3.13W 3.13 W x 9°C/W = 28.1°C RISE above case temperature Maximum Case Temperature = 150°C - 28.1°C = 121.9°C To lower power dissipation in the regulator, a dropping resistor can be added in series from V+ to the +REG IN pin. Using the above example, if V+ = 39V and there is no dropping resistor, total power dissipation rises to about 5.76 watts. Temperature rise is now 51.8°C above case temperature, limiting maximum case temperature to 98.2°C. By adding a dropping resistor to lower the +REG IN pin voltage to 24.1V, the regulator power dissipation is lowered to 2.19 watts. Temperature rise is now 19.7°C above case temperature, allowing a maximum case tem- perature all the way to +125°C. Rev. G 2/05 ALTERNATE REGULATOR CONNECTION OPTIONS By connecting the regulators in different ways, various capabilities can be obtained. 1. Higher than 55 volt operation - For operation at higher than 55 volt motor bus voltages, there are three options available: |
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