STV7801S

12/18

The timing of the control signals will be adjusted by

the trimmers of the RC cells. It is recommended to

enable the clamp signals (H-Clmp, L-Clmp) after

the rising (falling) edge of the output signal has

reached its maximum (minimum) value.

14 - RECOVERY FACTOR MEASUREMENT CONDITIONS

An idealised schematic of the Power Recovery application is defined below. The inductance (power sav-

ing mode) and the 2 capacitors (load, floating_supply) are external components for the D.P.S. device.

Figure 4. DPS Device : Functional Diagram

The Power Recovery Factor (PRF) in % is given

by the formula :

PRF = 100 x (Pc - Pr) / Pc.

– Pc is the theoretical capacitive power dissipated

in the switches S1, S2 of the Data Power Switch

device when S3, S4 are not activated. Pc is cal-

culated by the formula :

with F=switching frequency.

Cload = equivalent panel capacitance

– Pr is the power dissipated in the Data Power

Switch device when it is configured in a power re-

covery mode (S1, S2, S3, S4 activated). Pr is

calculated by multiplying the average current giv-

en by the current sensor A and the value of the

PRF is affected by the external components of the

DPS device such as the inductance and the de-

coupling capacitors, also the layout of the applica-

tion.

Cload

Vssp

A

Vpp

Inductance

(Power Saving Mode)

S1

S2

S3

S4

Cfloating_supply

P

C

Cl oad

2

xF

×

=