L6713ATR datasheet(45/64 Pages) STMICROELECTRONICS

45 / 64 page

L6713A

Soft-start

45/64

Figure 19.

Soft-start time for Intel mode when using RSSOSC versus SGND

16.2

AMD mode

Once L6713A receives all the correct supplies and enables, and AMD mode has been

selected, it initiates the soft-start by stepping the reference from zero up to the programmed

VID code (See Figure 15); the clock now used to step the reference is the same as the main

oscillator programmed by the OSC pin, SSOSC pin is not applicable in this case. The soft-

start time results then (See Figure 20):

where TSS is the time spent to reach VSS and FSW is the main switching frequency

programmed by OSC pin. Protections are active during soft-start, UVP is enabled after the

reference reaches 0.6 V while OVP is always active with the fixed 1.800 V threshold (or the

programmed VOVP).

Figure 20.

Soft-start time for AMD mode

0.5

1.5

2.5

3.5

4.5

100

1000

Rssosc [kOhms] vs. SGND

Time to Vboot

Time to 1.6000V

OUT

------------------

3.125 F

SW kkHz

[]

⋅

3.125 F

SW kHz

[]

⋅

-----------------------------------------------

⇒

0.5

1.5

2.5

3.5

200

400

600

800

1000

Rosc [kOhms] to SGND

150

200

250

300

350

400

450

500

550

Time to 1.6000V

Time to 1.1000V

Switching Frequency per phase

0.5

1.5

2.5

3.5

200

400

600

800

1000

Rosc [kOhms] to SGND

150

200

250

300

350

400

450

500

550

Time to 1.6000V

Time to 1.1000V

Switching Frequency per phase

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