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MIC5017BN Datasheet(PDF) 8 Page - Micrel Semiconductor |
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MIC5017BN Datasheet(HTML) 8 Page - Micrel Semiconductor |
8 / 12 page MIC5016/5017 Micrel MIC5016/5017 8 October 1998 Motor Driver With Stall Shutdown (Figure 10) Tachometer feedback can be used to shut down a motor driver circuit when a stall condition occurs. The control switch is a 3-way type; the “START” position is momentary and forces the driver ON. When released, the switch returns to the “RUN” position, and the tachometer’s output is used to hold the MIC5016 input ON. If the motor slows down, the tach output is reduced, and the MIC5016 switches OFF. Resistor “R” sets the shutdown threshold. Figure 10. Motor Stall Shutdown Simple DC-DC Converter (Figure 11) The simplest applica- tion for the MIC5016 is as a basic one-chip DC-DC converter. As the output (Gate) pin has a relatively high impedance, the output voltage shown will vary significantly with applied load. Incandescent/Halogen Lamp Driver (Figure 8) The combi- nation of an MIC5016/5017 and a power FET makes an effective driver for a standard incandescent or halogen lamp load. Such loads often have high inrush currents, as the resistance of a cold filament is less than one-tenth as much as when it is hot. Power MOSFETs are well suited to this application as they have wider safe operating areas than do power bipolar transistors. It is important to check the SOA curve on the data sheet of the power FET to be used against the estimated or measured inrush current of the lamp in question prior to prototyping to prevent “explosive” results. If overcurrent sense is to be used, first measure the duration of the inrush, then use the topology of Figure 5 with the RC of the timer chosen to accomodate the duration with suitable guardbanding. Figure 8: Halogen Lamp Driver Relay Driver (Figure 9) Some power relay applications re- quire the use of a separate switch or drive control, such as in the case of microprocessor control of banks of relays where a logic level control signal is used, or for drive of relays with high power requirements. The combination of an MIC5016/ 5017 and a power FET also provides an elegant solution to power relay drive. Figure 9: Relay Driver Figure 11. DC - DC Converter 1/2 MIC5016 Control Input OFF ON IRF540 12V Gate Gnd Source Input V+ 10µF OSRAM HLX64623 1/2 MIC5016 Control Input OFF ON IRF540 12V Gate Gnd Source Input V+ 10µF Guardian Electric 1725-1C-12D 1/2 MIC5016 Gate Gnd Source Input V+ 10µF 5V VOUT = 12V 1/2 MIC5016 IRFZ44 12V Gate Gnd Source Input V+ 10µF M T R 330k Ω 330k Ω 1N4148 |
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