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MIC5016 Datasheet(PDF) 7 Page - Micrel Semiconductor |
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MIC5016 Datasheet(HTML) 7 Page - Micrel Semiconductor |
7 / 12 page MIC5016/5017 Micrel October 1998 7 MIC5016/5017 1/2 MIC5016 OFF ON IRFZ40 24V Gate Gnd Source Input V+ 5k Ω 1N4005 ASCO 8320A Solenoid Typical Applications Variable Supply Low Side Driver for Motor Speed Control (Figure 6) The internal regulation in the MIC5016/17 allows a steady gate enhancement to be supplied while the MIC5016/ 17 supply varies from 5V to 30V, without damaging the internal gate to source zener clamp. This allows the speed of the DC motor shown to be varied by varying the supply voltage. Figure 6: DC Motor Speed Control/Driver Solenoid Valve Driver (Figure 7) High power solenoid valves are used in many industrial applications requiring the timed dispensing of chemicals or gases. When the solenoid is activated, the valve opens (or closes), releasing (or stopping) fluid flow. A solenoid valve, like all inductive loads, has a considerable “kickback” voltage when turned off, as current cannot change instantaneously through an inductor. In most applications, it is acceptable to allow this voltage to momen- tarily turn the MOSFET back on as a way of dissipating the inductor's current. However, if this occurs when driving a solenoid valve with a fast switching speed, chemicals or gases may inadvertantly be dispensed at the wrong time with possibly disasterous consequences. Also, too large of a kickback voltage (as is found in larger solenoids) can damage the MIC5016 or the power FET by forcing the Source node below ground (the MIC5016 can be driven up to 20V below ground before this happens). A catch diode has been included in this design to provide an alternate route for the inductive kickback current to flow. The 5k Ω resistor in series with this diode has been included to set the recovery time of the solenoid valve. Figure 7: Solenoid Valve Driver Figure 5. High Side Driver with Delayed Overcurrent Shutdown 1/2 MIC5017 Gate Gnd Source Input V+ 10µF R4 1k Ω R S 0.06 Ω 12V On R1 1k Ω R2 120k Ω LM301A 2.2k Ω 0.01µF LM3905N 1 2 3 4 8 7 6 5 Logic V+ Gnd R/C V REF Trigger Emit Coll 12V 1000pF 1k Ω 1/2 MIC5017 OFF ON IRF540 VCC = +5V to +30V Gate Gnd Source Input V+ M |
Similar Part No. - MIC5016 |
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Similar Description - MIC5016 |
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