ADP1048ARQZ-R7 datasheet(28/84 Pages) AD

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ADP1047/ADP1048

Data Sheet

Rev. 0 | Page 28 of 84

MANUFACTURER-SPECIFIC FLAG RESPONSE

Manufacturer-specific flags follow a different response from the

standard PMBus flags because these flags are much faster and,

in some cases, operate on a pulse-by-pulse basis.

FAST OCP Flag Response (Register 0xFE00)

The fast OCP flag responds to an overcurrent condition that

occurs on the comparator connected to the ILIM pin. This

comparator performs a pulse-by-pulse current limiting func-

tion (see the Fast Overcurrent Protection (ILIM Pin) section).

Four different actions can be programmed for this flag using

Bits[7:6]. Regardless of the programmed flag response, the PWM

pulse is always terminated when the threshold programmed for

the comparator is crossed.

•

00 (ignore, do nothing). No action is taken. The PWM

pulses are still terminated as long as the OCP condition

persists.

•

01 (shut down and soft start). The power supply is shut

down, and a soft start sequence is initiated after the delay

that is programmed in the IIN_OC_FAULT_RESPONSE

•

10 (shutdown and wait for PSON). After the number

of switching cycles programmed in Bits[5:4], the power

supply is shut down until the PSON signal is received.

•

11 (disable the PWM until the flag is cleared). After the

number of switching cycles programmed in Bits[5:4], the

PWM is disabled until the flag is cleared; no soft start is

initiated.

FAST OVP Flag Response (Register 0xFE01)

The fast OVP flag responds to an overvoltage condition on

the programmable comparator connected to the OVP pin.

This comparator constantly monitors the output voltage and

its operation (see the Fast Overvoltage Protection (OVP Pin)

section).

Four different actions can be programmed for this flag.

•

00 (ignore, do nothing). No action is taken.

•

01 (shut down and soft start). The power supply is shut

down, and a soft start sequence is initiated after the delay

programmed in the VOUT_OV_FAULT_RESPONSE

•

10 (immediate shutdown and wait for PSON). The power

supply is shut down until the PSON signal is received.

•

11 (disable the PWM until the flag is cleared). The PWM is

disabled until the flag is cleared; no soft start is done.

OLP Flag Response (Register 0xFE02)

The OLP flag responds to differences between the OVP and

VFB pins. Open-loop protection detects a difference in voltage

in excess of ~100 mV, which equates to approximately 6.6% of

the full-scale range (see the Open-Loop Protection section).

Four different actions can be programmed for this flag.

•

00 (ignore, do nothing). No action is taken.

•

01 (shut down and soft start). The power supply is shut

down, and a soft start sequence is initiated after the delay

programmed in the VOUT_OV_FAULT_RESPONSE

•

10 (immediate shutdown and wait for PSON). The power

supply is shut down until the PSON signal is received.

•

11 (disable the PWM until the flag is cleared). The PWM is

disabled until the flag is cleared; no soft start is done.

VDD and VCORE OV Flag Response (Register 0xFE03 and

These two flags respond to an overvoltage condition on the

VDD (3.3 V) and VCORE (2.5 V) rails. These rails must be

properly decoupled and filtered to guarantee proper operation

of the digital controller. The controller can be programmed to

ignore the flags or to shut down and restart. A debounce time

of 2.56 μs or 660 μs can be set.

The controller can also be instructed to reload the contents

of the EEPROM upon restart or to resume operation without

reloading the EEPROM contents. Reloading the contents of the

EEPROM to RAM prevents device malfunction if the RAM

contents have been corrupted during the overvoltage condition.

BLANKING AND

DEBOUNCE

TERMINATE

PWM PULSE

FAST OCP

ILIM

FLAG SET,

PROGRAMMED

ACTIONS

TIMEOUT

1 TO 8 TIMES

Figure 26. Fast OCP Flag

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