AT9173 DATASHEET PDF

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An over-current trip cycles the soft-start function. N is the number of terminals. Include worst case component variations when determining phase margin.

This pin is also monitored by the adaptive shootthrough protection circuitry to determine when the lower MOSFET has turned off. Shoot-Through Protection A shoot-through condition occurs when both the upper and lower MOSFETs are turned on simultaneously, effectively shorting the input voltage to ground.

Unfortunately, ESL is not a specified parameter. The worst case response time can be either at the application or removal of load. The maximum RMS current required by the regulator may be closely approximated through the following equation: Use only specialized low-ESR capacitors intended for switching-regulator applications for the bulk capacitors.

Dedicate one solid layer, usually a middle layer of the PC board, for a ground plane and make all critical component ground connections with vias to this layer.

Minimize the length of the connections between the input capacitors, CIN, and the power switches qt9173 placing them nearby. Use copper filled polygons on the top and bottom circuit layers for the phase nodes. With a properly selected divider, VDDQ can be set to any voltage between the power rail reduced xt9173 converter losses and the 0.

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Datasheet archive on 14-6-2011

The power dissipation includes two loss components; conduction loss and switching loss. Select a package and heatsink a9t173 maintains the junction temperature below the rating with a maximum expected ambient temperature. However, the Equivalent Series Inductance ESL of these capacitors increases with case size and can reduce the usefulness of the capacitor to high slew-rate transient loading.

High frequency capacitors initially supply the transient and slow the current load rate seen by the bulk capacitors. This pin is monitored for under-voltage events. Datasheeet the disabled regulator is used as the input for another regulator, then that cascoded regulator will also experience a fault condition due to a loss of input.

The following equations give the approximate response time interval for application and removal of a transient load: A kHz Synchronous Buck Regulator with a precision 0. The switching losses seen when sourcing current will be different from the switching losses seen when sinking current.

Information furnished by Intersil is believed to be accurate and reliable. Approximate Losses while Sourcing current 2 1 -? The power dissipated in the linear regulator is: The supply to 5VSBY should be locally bypassed using a 0.

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Careful component selection, tight layout of the critical components, and short, wide traces minimizes the magnitude of voltage spikes. Doing so may interfere with the shootthrough protection. In high-current applications, the MOSFET power dissipation, package selection and heatsink are the dominant design factors.

ATE datasheet & applicatoin notes – Datasheet Archive

The filtering requirements dataaheet a function of the switching frequency and the ripple current. For surface mount designs, solid tantalum capacitors can be used, but caution must be exercised with regard to the capacitor surge current rating. This enables the ATX, which brings up the 12V rail.

This reset lasts for three soft start cycles, which is typically 24ms one soft start cycle is typically 8.

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I is the output inductor ripple current. The output is user-adjustable by means of external resistors down to 0. The ISL will immediately shut down when the Fault Counter reaches a count of 4 when the system is restarting from an S5 state into the active, or S0, state. If a regulator is already in regulation, then it will not be affected by the start up sequencing.