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TPS84259RKGT Folha de dados(PDF) 21 Page - Texas Instruments |
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TPS84259RKGT Folha de dados(HTML) 21 Page - Texas Instruments |
21 / 32 page VOUT VIN TPS84259 -VOUT VIN CIN COUT CIO TPS84259 www.ti.com SLVSBA0B – AUGUST 2012 – REVISED SEPT 2013 Input to Output Coupling Capacitor Adding an input to output coupling capacitor (CIO) across VIN to VOUT as shown in Figure 48 can help reduce output voltage ripple and improve transient response. A typical value for CIO is 2.2 µF ceramic with a voltage rating greater than the sum of VIN + |VOUT|. Figure 48. Input to Output Coupling Capacitor Overcurrent Protection For protection against load faults, the TPS84259 incorporates cycle-by-cycle current limiting. During an overcurrent condition the output current is limited and the output voltage is reduced. If the output voltage drops more than 25%, the switching frequency is lowered to reduce power dissipation within the device. When the overcurrent condition is removed, the output voltage returns to the established voltage. The TPS84259 is not designed to endure a sustained short circuit condition. The use of an output fuse, voltage supervisor circuit, or other overcurrent protection circuit is recommended. Thermal Shutdown The internal thermal shutdown circuitry forces the device to stop switching if the junction temperature exceeds 180°C typically. The device reinitiates the power up sequence when the junction temperature drops below 165°C typically. Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 21 Product Folder Links: TPS84259 |
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