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AP2141D_1009 Datasheet(PDF) 10 Page - Diodes Incorporated |
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AP2141D_1009 Datasheet(HTML) 10 Page - Diodes Incorporated |
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10 / 17 page  AP2141D/AP2151D 0.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH WITH OUTPUT DISCHARGE AP2141D/2151D Document number: DS32242 Rev. 2 - 2 10 of 17 www.diodes.com September 2010 © Diodes Incorporated Application Note The AP2141D and AP2151D are integrated high-side power switches optimized for Universal Serial Bus (USB) that require protection functions. The power switches are equipped with a driver that controls the gate voltage and incorporates slew-rate limitation. This, along with the various protection features and special functions, makes these power switches ideal for hot-swap or hot-plug applications. Protection Features: Under-voltage Lockout (UVLO) Under-voltage lockout function (UVLO) guarantees that the internal power switch is initially off during start-up. The UVLO functions only when the switch is enabled. Even if the switch is enabled, the switch is not turned ON until the power supply has reached at least 1.9V. Whenever the input voltage falls below approximately 1.9V, the power switch is turned off. This facilitates the design of hot-insertion systems where it is not possible to turn off the power switch before input power is removed. Over-current and Short Circuit Protection An internal sensing FET is employed to check for over- current conditions. Unlike current-sense resistors, sense FETs do not increase the series resistance of the current path. When an overcurrent condition is detected, the device maintains a constant output current and reduces the output voltage accordingly. Complete shutdown occurs only if the fault stays long enough to activate thermal limiting. The different overload conditions and the corresponding response of the AP2141D/2151D are outlined below: S.NO Conditions Explanation Behavior of the AP2141D/2151D 1 Short circuit condition at start-up Output is shorted before input voltage is applied or before the part is enabled The IC senses the short circuit and immediately clamps output current to a certain safe level namely ILIMIT. 2 Short-circuit or Overcurrent condition Short-Circuit or Overload condition that occurs when the part is enabled. • At the instance the overload occurs, higher current may flow for a very short period of time before the current limit function can react. • After the current limit function has tripped (reached the over-current trip threshold), the device switches into current limiting mode and the current is clamped at ILIMIT. 3 Gradual increase from nominal operating current to ILIMIT Load increases gradually until the current-limit threshold.(ITRIG) The current rises until ITRIG or thermal limit. Once the threshold has been reached, the device switches into its current limiting mode and is set at ILIMIT. Note that when the output has been shorted to GND at extremely low temperature (< -20 oC), a minimum 120 μF electrolytic capacitor on the output pin is recommended. A correct capacitor type with capacitor voltage rating and temperature characteristics must be properly chosen so that capacitance value does not drop too low at the extremely low temperature operation. A recommended capacitor should have temperature characteristics of less than 10% variation of capacitance change when operated at extremely low temp. Our recommended aluminum electrolytic capacitor type is Panasonic FC series. |
Similar Part No. - AP2141D_1009 |
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Similar Description - AP2141D_1009 |
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