MIC5021 Micrel Semiconductor, MIC5021 Datasheet
MIC5021
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MIC5021 Summary of contents
Page 1
... A duty cycle from 20% to about 75% is possible with an optional pull-up resistor from C The MIC5021 is available in 8-pin SOIC and plastic DIP packages. Other members of the MIC502x family include the MIC5020 low-side driver and the MIC5022 half-bridge driver with a cross-conduction interlock ...
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... MIC5021 Pin Configuration Block Diagram 6V Internal Regulator C INT Sense + Sense – 50mV Input Transistor: 106 Pin Description Pin Number Pin Name Input Gnd 5 Sense + 6 Sense – 7 Gate 8 V BOOST BOOST DD Gate 2 Input 7 2 Input C Sense ...
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... MIC5021 Absolute Maximum Ratings Supply Voltage (V ) .................................................. +40V DD Input Voltage ................................................ –0.5V to +15V Sense Differential Voltage .......................................... 6.5V Sense + or Sense – to Gnd .......................... –0.5V to +36V Timer Voltage (C ) ..................................................... +5. Capacitor .................................................... 0.01 F BOOST Electrical Characteristics Gnd = 0V 12V Open, Gate Symbol Parameter D.C. Supply Current Input Threshold ...
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... MIC5021 Typical Characteristics Supply Current vs. Supply Voltage 2 2 1.0 0.5 0 (V) SUPPLY Gate Turn-On Delay vs. Supply Voltage 1000 10V GATE SUPPLY C = 1500pF (IRCZ34) 950 0.01 F BOOST 900 850 800 INCLUDES PROPAGATION DELAY 750 ...
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... This reduces the chances of short-to-ground accidents or failures. Speed Advantage The MIC5021 is about two orders of magnitude faster than the low cost MIC5014 making it suitable for high-frequency high-efficiency circuit operation in PWM (pulse width modu- lation) designs used for motor control, SMPS (switch mode power supply) and heating element control. Switched loads (on/off) benefit from the MIC5021’ ...
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... Increasing the duty cycle increases the power dissipation in the load and MOSFET under a “fault” condition. Circuits may become unstable at a duty cycle of about 75% or higher, depending on conditions. Caution: The MIC5021 may be damaged if the voltage applied to C maximum voltage rating. Boost Capacitor Selection The boost capacitor value will vary depending on the supply voltage range ...
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... V+ N-Channel Power MOSFET 0.01 µF Sense Pin Considerations Load The sense pins of the MIC5021 are sensitive to negative voltages. Forcing the sense pins much below –0.5V effec- tively reverses the supply voltage on portions of the driver + SENSE resulting in unpredictable operation or damage. pins to ground. SENSE Figure 6 shows current flowing out of the sense leads of an MIC5021 during a negative transient (inductive kick) ...
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... Lamp Driver Application Incandescent lamps have a high inrush current (low resis- tance) when turned on. The MIC5021 can perform a “soft start” by pulsing the MOSFET (overcurrent condition) until the filament is warm and its current decreases (resistance increases). The sense resistor value is selected so the voltage drop across the sense resistor decreases below the sense threshold (50mV) as the filament becomes warm ...
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... Low-Temperature Operation As the temperature of the MIC5021AJB (extended tempera- ture range version—no longer available) approaches –55 C, the driver’s off-state, gate-output offset from ground in- creases. If the operating environment of the MIC5021AJB includes low temperatures (– ...