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MIC2003-0.5YM5 Datasheet(PDF) 11 Page - Micrel Semiconductor |
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MIC2003-0.5YM5 Datasheet(HTML) 11 Page - Micrel Semiconductor |
11 / 16 page Micrel MIC2003/MIC20013 October 2005 11 M9999-102605 hbwhelp@micrel.com or (408) 955-1690 Functional Description Input and Output VIN is both the power supply connection for the internal circuitry driving the switch and the input (Source connection) of the power MOSFET switch. VOUT is the Drain connection of the power MOSFET and supplies power to the load. In a typical circuit, current flows from VIN to VOUT toward the load. Since the switch is bi- directional when enabled, if VOUT is greater than VIN, current will flow from VOUT to VIN. When the switch is disabled, current will not flow to the load, except for a small unavoidable leakage current of a few microamps. However, should VOUT exceed VIN by more than a diode drop (~0.6V), while the switch is disabled, current will flow from output to input via the power MOSFET’s body diode. This effect can be used to advantage when large bypass capacitors are placed on MIC2003/2013’s’s output. When power to the switch is removed, the output capacitor will be automatically discharged. If discharging CLOAD is required by your application, consider using MIC2003/2013 or MIC2007/2017 in place of MIC2003/2013. These MIC2000 family members are equipped with a discharge FET to insure complete discharge of CLOAD. Current Sensing and Limiting MIC2003/2013 protects the system power supply and load from damage by continuously monitoring current through the on-chip power MOSFET. Load current is monitored by means of a current mirror in parallel with the power MOSFET switch. Current limiting is invoked when the load exceeds an internally set over-current threshold. When current limiting is activated the output current is constrained to the limit value, and remains at this level until either the load/fault is removed, the load’s current requirement drops below the limiting value, or the MIC2003/2013 goes into thermal shutdown. Kickstart (MIC2013 only) The MIC2013 is designed to allow momentary current surges (Kickstart) before the onset of current limiting, which permits dynamic loads, such as small disk drives or portable printers to draw the energy needed to overcome inertial loads without sacrificing system safety. In this respect, the MIC2013 differs markedly from MIC2003 and its peers, which immediately limit load current, potentially starving the motor and causing the appliance to stall or stutter. During this delay period, typically 128 ms, a secondary current limit is in effect. If the load demands a current in excess the secondary limit, MIC2013 acts immediately to restrict output current to the secondary limit for the duration of the Kickstart period. After this time the MIC2013 reverts to its normal current limit. An example of Kickstart operation is shown below. T U O T U O Figure 3. Kickstart Operation Picture Key: A) MIC2013 is enabled into an excessive load (slew rate limiting not visible at this time scale) The initial current surge is limited by either the overall circuit resistance and power supply compliance, or the secondary current limit, whichever is less. B) RON of the power FET increases due to internal heating (effect exaggerated for emphasis). C) Kickstart period. D) Current limiting initiated. FAULT/ goes LOW. E) VOUT is non-zero (load is heavy, but not a dead short where VOUT = 0. Limiting response will be the same for dead shorts). F) Thermal shutdown followed by thermal cycling. G) Excessive load released, normal load remains. MIC2013 drops out of current limiting. H) FAULT/ delay period followed by FAULT/ going HIGH. Slew Rate Control Large capacitive loads can create significant current surges when charged through a high-side switch such as the MIC2003/2013. For this reason, MIC2003/2013 provides built-in slew rate control to limit the initial inrush currents upon enabling the power MOSFET switch. Slew rate control is active upon powering up, and upon re-enabling the load. At shutdown, the discharge slew rate is controlled by the external load and output capacitor. |
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