XRP7725 datasheet(21/34 Pages) EXAR

21 / 34 page

Multiple selections will be combi

using the OR logic function.

•

External

Clock-in

–

enables

the

controller to lock to an external clock

including

one

from

another

applied to the GPIO0 pin. There are two

ranges of clock frequencies the controller

accepts, selectable by a user.

•

HW Power Good – the Power Good

hardware monitoring function. It can only

be forwarded to GPIO1. This is an output

voltage

monitoring

function

that

hardware comparison of channel output

voltage against its user defined Power

Good

threshold

limits

(Po

minimum and maximum levels). It has no

hysteresis. Multiple channel selections will

be combined using the AND logic function

of all channels selected.

The Power Good minimum and maximum

levels are expressed as percentages of the

target voltage.

“PGood Max” is the upper window and

“PGood Min” is the lower window.

The

minimum and maximum for each of these

ntte

ell N

e M

r C

attiib

blle

r M

21/34

Multiple selections will be combined

using the OR logic function.

enables

the

controller to lock to an external clock

including

one

from

another

XRP7725

applied to the GPIO0 pin. There are two

ranges of clock frequencies the controller

the Power Good

hardware monitoring function. It can only

be forwarded to GPIO1. This is an output

voltage

monitoring

function

that

hardware comparison of channel output

voltage against its user defined Power

Good

threshold

limits

(Power

Good

minimum and maximum levels). It has no

hysteresis. Multiple channel selections will

be combined using the AND logic function

The Power Good minimum and maximum

levels are expressed as percentages of the

“PGood Max” is the upper window and

“PGood Min” is the lower window.

The

minimum and maximum for each of these

values can be calculated with the following

equation:

Where N=1 to 63 for the PGOOD Max

value and N=1 to 62 for the PGOOD Min

value.

For example, with the target

voltage of 1.5V and set point resolution of

2.5mV (LSB), the Power Good min and

max values can range from 0.17% to

10.3% and 0.17% to 10.5% respectively.

A user can effectively do

changing

the

higher

output

voltage range setting, but at the expense

of reduced set point resolution.

•

External Clock-out

through

GPIO1

for

synchronizing

with

another

XRP7725

(see

the

clock

out

section for more information).

FAULT HANDLING

There are seven different types

fault

handling:

•

Under

Voltage

Lockout

(UVLO)

monitors voltage supplied to the

and will cause the controller to shut down

all channels if the supply drops to critical

levels.

•

Over Temperature Protection (OTP)

monitors temperature of the chip and will

cause the controller to shut down all

channels if temperature rises to critical

levels.

•

Over

Voltage

Protection

(OVP)

monitors regulated voltage of a

and will cause the controll

user specified way if the regulated voltage

surpasses threshold level.

•

Over

Current

Protection

(OCP)

monitors current of a channel and will

cause the controller to react in a user

specified

way

the

current

level

surpasses threshold lev

•

Start-up

Time-out

Fault

whether a channel gets into regulation in

a user defined time period

•

LDO5 Over Current Protection (LDO5

OCP) monitors current

e P

blle

ntt S

stte

Rev. 1.0.0

values can be calculated with the following

Where N=1 to 63 for the PGOOD Max

value and N=1 to 62 for the PGOOD Min

value.

For example, with the target

voltage of 1.5V and set point resolution of

2.5mV (LSB), the Power Good min and

max values can range from 0.17% to

10.3% and 0.17% to 10.5% respectively.

A user can effectively double the range by

changing

the

higher

output

voltage range setting, but at the expense

of reduced set point resolution.

– clock sent out

through

GPIO1

for

synchronizing

with

(see

the

clock

out

ormation).

different types

fault

Under

Voltage

Lockout

(UVLO)

nitors voltage supplied to the VCC pin

and will cause the controller to shut down

all channels if the supply drops to critical

Temperature Protection (OTP)

monitors temperature of the chip and will

cause the controller to shut down all

channels if temperature rises to critical

Over

Voltage

Protection

(OVP)

regulated voltage of a channel

and will cause the controller to react in a

user specified way if the regulated voltage

surpasses threshold level.

Over

Current

Protection

(OCP)

monitors current of a channel and will

cause the controller to react in a user

way

the

current

level

surpasses threshold level.

out

Fault

monitors

a channel gets into regulation in

a user defined time period

LDO5 Over Current Protection (LDO5

current drawn from the

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