STELPD01APUR datasheet(12/27 Pages) STMICROELECTRONICS

12 / 27 page

Figure 8. External gate driver circuit

VUP

STELPD01

30 μA

GND

Pull down signal

Pull up block

Pull down block

VOUT

Maximum clamp voltage

6.9

External capacitors and application guidelines

Input and output capacitors are mandatory to guarantee device control loop stability and reduce the transient

effects of stray inductances which may be present on the input and output power paths. In fact, when the

STELPD01 interrupts the current flow, input inductance generates a positive voltage spike on the input, and

output inductance generates a negative voltage spike on the output. To reduce the effects of such transients,

a CIN capacitor of at least 1 μF must be connected between the input pin and GND, and located as close as

possible to the device.

For the same reason, a COUT capacitor of at least 1 μF must be connected at the output port.

When the device is powered by a power line made up of very long wires, where input inductance is higher than 1

μH, the input capacitor should be increased.

It is recommended to provide for additional protections and methods for addressing these transients, such as:

•

Minimizing inductance of the input and output tracks

•

TVS diodes on the input to absorb inductive spikes

•

Schottky diode on the output to absorb negative spikes

•

Combination of ceramic and electrolytic capacitors on the input and output

STELPD01

External capacitors and application guidelines

DS13254 - Rev 1

page 12/27

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