MP8796B datasheet(47/52 Pages) MPS

47 / 52 page

MP8796B – 16V, 30A, SYNCHRONOUS STEP-DOWN CONVERTER WITH PMBUS

MP8796B Rev. 1.0

www.MonolithicPower.com

1/19/2020

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

MFR_OT_OC_SET (D6h)

The MFR_OT_OC_SET command sets the responses of OCP, and sets the responses and hysteresis

of OTP. This is a 1-byte command.

Bits

Name

Access

Behavior

Default

Description

[7:4]

RESERVED

0000

[3]

OC_response

R/W

Live

0: Latch off, never retry

1: Retry

[2:1]

OT_hyst

R/W

Live

00: 20°C

01: 25°C

10: 30°C

11: 35°C

[0]

OT_Response

R/W

Live

0: Latch off, never retry

1: Retry after the temp drops by the value set by bit[2:1]

The MFR_OT_OC_SET command tells the converter which action to take in response to an over-

temperature fault and a total output over-current fault.

The default value of D6h is 0x00.

MFR_OC_PHASE_SET (D7h)

The MFR_OC_PHASE_SET command sets the inductor valley current limit of each individual phase.

This is a cycle-by-cycle current limit. After 31 consecutive cycles of an over-current (OC) condition,

OCP is triggered. This is a 1-byte command.

Bits

Name

Access

Behavior

Default

Description

[7:5]

RESERVED

000

[4:0]

OC_limit

R/W

Live

10101

Current limit. 1.5A/LSB, [00000] = 0A.

The value is unsigned, and 1LSB = 1.5A. The default value of D7h is 0x15, which corresponds to 31.5A

of the inductor valley current limit.

MFR_HICCUP_ITV_SET (D8h)

This MFR_HICCUP_ITV_SET command sets the hiccup interval during OCP. This is a 1-byte

command.

Bits

Name

Access

Behavior

Default

Description

[7:6]

RESERVED

[5:0]

Hiccup_itv

R/W

Live

000000

OC fault hiccup interval time.

000000: 4ms

1 LSB = 4ms

D8h is only effective when EAh bit[10] is set to 1 and reaches the total output current limit.

When EAh bit[10] is set to 0 or when it reaches the inductor valley current limit set by

MFR_OC_PHASE_LIMIT, the OCP hiccup time is about five times the soft-start time set by TON_RISE

(61h).

The default value of D8h is 0x00.

MP8796B Datasheet(PDF) 47 Page - Monolithic Power Systems

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