TPS1663 datasheet(28/42 Pages) TI1

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spike Absolute

Load

TPS16632

PŸ

OUT

dVdT

ILIM

P_IN

RILIM

FLT

GND

SHDN

UVLO

PLIM

MODE

IMON

PGOOD

VIN

ON/OFF Control

COUT

VOUT

CIN

TPS1663

SLVSET9C – SEPTEMBER 2018 – REVISED MARCH 2019

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Product Folder Links: TPS1663

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System Examples (continued)

Figure 37. TPS16630 Configured for a Simple Power Supply Path Protection

Protection features with this configuration include:

•

39 V (maximum) overvoltage clamp output

•

Inrush current control with 24V/500 µs output voltage slew rate

•

Accurate current limiting with Auto-Retry

11 Power Supply Recommendations

The TPS1663x eFuse is designed for the supply voltage range of 4.5 V

≤ VIN ≤ 60 V. If the input supply is

located more than a few inches from the device, an input ceramic bypass capacitor higher than 0.1 μF is

recommended. Power supply must be rated higher than the current limit set to avoid voltage droops during

overcurrent and short circuit conditions.

11.1 Transient Protection

In case of short circuit and overload current limit, when the device interrupts current flow, input inductance

generates a positive voltage spike on the input and output inductance generates a negative voltage spike on the

output. The peak amplitude of voltage spikes (transients) depends on the value of inductance in series to the

input or output of the device. These transients can exceed the Absolute Maximum Ratings of the device if steps

are not taken to address the issue.

Typical methods for addressing transients include:

•

Minimizing lead length and inductance into and out of the device

•

Using large PCB GND plane

•

Use of a Schottky diode across the output and GND to absorb negative spikes

•

A low value ceramic capacitor (C(IN) to approximately 0.1 μF) to absorb the energy and dampen the

transients.

The approximate value of input capacitance can be estimated with Equation 10.

where

•

V(IN) is the nominal supply voltage

•

I(LOAD) is the load current

•

L(IN) equals the effective inductance seen looking into the source

•

C(IN) is the capacitance present at the input

(10)

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