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AP2191DFMG-7 Datasheet(PDF) 11 Page - Diodes Incorporated |
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AP2191DFMG-7 Datasheet(HTML) 11 Page - Diodes Incorporated |
11 / 18 page AP2181D/AP2191D 1.5A SINGLE CHANNEL CURRENT-LIMITED POWER SWITCH WITH OUTPUT DISCHARGE AP2181D/2191D Document number: DS32251 Rev. 1 - 2 11 of 18 www.diodes.com June 2010 © Diodes Incorporated Application Note (Continued) Power Dissipation and Junction Temperature The low on-resistance of the internal MOSFET allows the small surface-mount packages to pass large current. Using the maximum operating ambient temperature (TA) and RDS(ON), the power dissipation can be calculated by: PD = RDS(ON)× I 2 Finally, calculate the junction temperature: TJ = PD x RθJA + TA Where: TA= Ambient temperature °C RθJA = Thermal resistance PD = Total power dissipation Generic Hot-Plug Applications In many applications it may be necessary to remove modules or pc boards while the main unit is still operating. These are considered hot-plug applications. Such implementations require the control of current surges seen by the main power supply and the card being inserted. The most effective way to control these surges is to limit and slowly ramp the current and voltage being applied to the card, similar to the way in which a power supply normally turns on. Due to the controlled rise times and fall times of the AP2181D/AP2191D, these devices can be used to provide a softer start-up to devices being hot-plugged into a powered system. The UVLO feature of the AP2181D/AP2191D also ensures that the switch is off after the card has been removed, and that the switch is off during the next insertion. By placing the AP2181D/AP2191D between the VCC input and the rest of the circuitry, the input power reaches these devices first after insertion. The typical rise time of the switch is approximately 1ms, providing a slow voltage ramp at the output of the device. This implementation controls system surge current and provides a hot- plugging mechanism for any device. |
Similar Part No. - AP2191DFMG-7 |
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Similar Description - AP2191DFMG-7 |
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