Detailed description

SPV1020

8/19

Doc ID 17588 Rev 3

5

Detailed description

The SPV1020 is a fully integrated high efficiency DC-DC boost converter with 4-phase

interleaved topology operating in the voltage range from 6.5 VDC to 40 VDC. A simplified

block diagram showing only one of the four phases is shown in

Figure 3 below.

Figure 3.

Simplified block diagram

5.1

Initialization and startup mode

In order to guarantee a correct power-up sequence, the converter initially operates in burst

mode. When the input voltage is greater than 6.5 V, the converter sequentially activates

each of the four phases.

Initially, only phase 1 starts to work in burst mode, charging the inductor only for one cycle

over 15 cycles. Then the duty cycle is progressively increased until phase 1 is switched on

at every cycle and at the default switching frequency of 100 kHz.

After phase 1 has reached its steady-state condition, all the other phases are progressively

switched on in the following sequence: phase 3, phase 2 and, lastly, phase 4.

All the sequences are running when the power generated by the PV cells is increasing.

Otherwise the sequence may go back and then forward again.