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MC34164P-5RA Datasheet(PDF) 6 Page - ON Semiconductor |
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MC34164P-5RA Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 14 page MC34164, MC33164, NCV33164 http://onsemi.com 6 Figure 15. Low Voltage Microprocessor Reset With Additional Hysteresis (MC3X164−5 Shown) Power Supply 1.2 Vref Microprocessor Circuit RL GND Reset Comparator hysteresis can be increased with the addition of resistor RH. The hysteresis equation has been simplified and does not account for the change of input current Iin as Vin crosses the comparator threshold (Figure 8). An increase of the lower threshold DVth(lower) will be observed due to Iin which is typically 10 mA at 4.3 V. The equations are accurate to ±10% with RH less than 1.0 kW and RL between 4.3 kW and 43 kW. VH ≈ 4.3 RH RH MC3X164−5 Iin Vin Test Data VH (mV) DVth (mV) RH ( W) RL (k W) 60 103 123 160 155 199 280 262 306 357 421 530 0 1.0 1.0 1.0 2.2 2.2 2.2 4.7 4.7 4.7 4.7 4.7 0 100 100 100 220 220 220 470 470 470 470 470 43 10 6.8 4.3 10 6.8 4.3 10 8.2 6.8 5.6 4.3 RL + 0.06 DVth(lower) ≈ 10 RH x 10 − 6 where: RH ≤ 1.0 kW 43 k W ≥ RL ≥ 4.3 kW Figure 16. Voltage Monitor Figure 17. Solar Powered Battery Charger Figure 18. MOSFET Low Voltage Gate Drive Protection Using the MC3X164−5 1.2 Vref Input 270 Reset GND Power Supply 1.2 Vref Input 1.0 k GND 1.2 Vref Input GND Solar Cells RL MTP3055EL MC3X164−5 VCC 4.3V Overheating of the logic level power MOSFET due to insufficient gate voltage can be prevented with the above circuit. When the input signal is below the 4.3 V threshold of the MC3X164−5, its output grounds the gate of the L2 MOSFET. Reset Reset |
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