Application information

STCH02

16/24

DocID028766 Rev 1

3.7

Voltage feedforward block

Equation 1. Actually, the CC comparator will be affected by an internal propagation delay

Td, which will switch off the MOSFET with a peak current than higher the foreseen value.

The STCH02 device implements a line feedforward function, which solves the issue by

introducing an input voltage dependent offset on the current sense signal, in order to adjust

the cycle-by-cycle current limitation.

The external schematic configuration is shown in Figure 9.

Figure 9. Feedforward compensation: internal schematic

Equation 2

In this case the peak drain current does not depend on input voltage anymore.

S E N S E

D

F F

P R

P R I

A U X

Z C D

R

T

R

L

N

N

R

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