7

Operation description

7.1

Enable

switched off.

Once the EN pin voltage exceeds the threshold value, then the device immediately switches on following the

start-up sequence.

7.1.1

Digital enable

The device can be enabled/disabled using the external pin EN, which switches off the DC-DC, the oscillator and

the digital core completely.

Dig_EN bit

EN pin

DC-DC state

Pon

-

Low

OFF

Stop

Functional

Low

High

Functional

Stop

Functional

High

High

Functional

Operating

Functional

7.2

Cable drop compensation

In some applications, the output voltage needs to be increased proportionally to load current to compensate the

potential voltage drop across copper tracks (and output cable). The compensation acts by altering the current

flowing in the high-side of the voltage feedback resistor divider. The resulting compensation voltage is expressed

as follows:

ΔVout=k⋅ILOAD⋅RSENSE⋅ RCDC1/RCDC2

(1)

The cable drop compensation loop should be very slow to avoid potential disturbance to the voltage loop. This

STPD01

Operation description

DS13473 - Rev 1

page 17/43