Diodes AP7361 Manuel d'utilisateur télécharger pdf (Page 13)

AP7361

Document number: DS33626 Rev. 9 - 2

13 of 22

www.diodes.com

October 2013

P7361

Application Information

No Load Stability

Other than external resistor divider, no minimum load is required to keep the device stable. The device will remain stable and regulated in no load

condition.

ON/OFF Input Operation

The ON/OFF feature is not available in the SOT223 and TO252 package.

The AP7361 is turned on by setting the EN pin high, and is turned off by pulling it low. If this feature is not used, the EN pin should be tied to IN pin

to keep the regulator output on at all time. To ensure proper operation, the signal source used to drive the EN pin must be able to swing above and

below the specified turn-on/off voltage thresholds listed in the Electrical Characteristics section under V

and V

IH.

Current Limit Protection

When output current at OUT pin is higher than current limit threshold, the current limit protection will be triggered and clamp the output current to

prevent over-current and to protect the regulator from damage due to overheating.

Short Circuit Protection

When OUT pin is short-circuit to GND, short circuit protection will be triggered and clamp the output current to approximately 200mA. Full current is

restored when the output voltage exceeds 15% of Vout. This feature protects the regulator from over-current and damage due to overheating.

Thermal Shutdown Protection

Thermal protection disables the output when the junction temperature rises to approximately +150°C, allowing the device to cool down. When the

junction temperature reduces to approximately +130°C the output circuitry is enabled again. Depending on power dissipation, thermal resistance,

and ambient temperature, the thermal protection circuit may cycle on and off. This cycling limits the heat dissipation of the regulator, protecting it

from damage due to overheating.

Ultra Fast Start-up

After enabled, the AP7361 is able to provide full power in as little as tens of microseconds, typically 200µs, without sacrificing low ground current.

This feature will help load circuitry move in and out of standby mode in real time, eventually extend battery life for mobile phones and other portable

devices.

Low Quiescent Current

The AP7361, consuming only around 70µA for all input range, provides great power saving in portable and low power applications.

Power Dissipation

The device power dissipation and proper sizing of the thermal plane that is connected to the thermal pad is critical to avoid thermal shutdown and

ensure reliable operation. Power dissipation of the device depends on input voltage and load conditions and can be calculated by:

= (V

- V

OUT

) X I

OUT

The maximum power dissipation, handled by the device, depends on the maximum junction to ambient thermal resistance, maximum ambient

temperature, and maximum device junction temperature, which can be calculated by the equation in the following:

)

T-C150(

)

T(max@P







1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 21 22

Commentaires sur ces manuels

Pas de commentaire

Diodes AP7361 Manuel d'utilisateur Page 13

Commentaires sur ces manuels

Produits connexes et manuels pour Matériel Diodes AP7361