L6717 datasheet(41/56 Pages) STMICROELECTRONICS

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L6717

Output voltage monitoring and protections

Doc ID 17326 Rev 1

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Output voltage monitoring and protections

L6717 monitors the regulated voltage of both sections through pin VSEN and NB_VSEN in

order to manage OV, UV and PWRGOOD. The device shows different thresholds when in

different operative conditions but the behavior in response to a protection event is still the

same as described below.

Protections are active also during soft-start (See Section 7.8) while they are masked during

OTF-VID transitions with an additional delay to avoid false triggering.

Table 20.

L6717 protection at a glance

8.1

Programmable overvoltage (I2DIS = 3.3 V)

When power manager I2C is disabled, L6717 provides the possibility to adjust OV threshold

(common for both sections) through the SDA/OVP pin. Connecting the pin to the center tap

of a voltage divider from 3.3 V to SGND, the OVP threshold becomes the voltage present at

the pin.

The OVP threshold results:

L6717

Section

CORE

North bridge

Overvoltage

(OV)

SVI / PVI: +250mV above reference, programmable by power manager

I2C bus.

I2CDIS = 3.3V: Programmable through SDA/OVP pin.

V_FIX: Fixed to 1.8V.

Action: IC Latch; LS=ON & PWMx = 0 (if applicable);

Other section (SVI only): HiZ; FLT driven high.

Undervoltage

(UV)

VSEN, NB_VSEN = VID -400mV. Active after Ref > 500mV

Action: IC latch; both sections HiZ; FLT driven high.

PWRGOOD

PWRGOOD is the logic AND between internal CORE and NB PGOOD in SVI

mode while is the CORE section PGOOD in PVI mode.

Each PGOOD is set to zero when the related voltage falls below the

programmed reference -250mV.

Action: Section(s) continue switching, PWRGOOD driven low.

VSEN, NB_VSEN

disconnection

Set when VSEN > CS1N +600mV.

Action: UV-Like

Set when VSEN > NB_CSN +600mV.

Action: UV-Like (SVI only)

FBG, NB_FBG

disconnection

Internal comparator across the opamp to recover from GND losses.

Action: UV-Like

Over Current

(OC)

Current monitor across inductor DCR.

Dual protection, per-phase and

average.

Action: UV-Like

Current monitor across inductor DCR.

Constant current.

Action: UV-Like

On-the-fly VID

Protections masked with the exception of OC with additional 16 clock delay to

prevent from false triggering (both SVI and PVI).

OVP

3.3

OVPL

OVPH

OVPL

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⋅

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