VOUT

VIN

TPS84259

TPS84259

www.ti.com

SLVSBA0B – AUGUST 2012 – REVISED SEPT 2013

Input to Output Coupling Capacitor

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

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