SLDM-06D1Ax

27

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Rev. AC

44. OUTPUT VOLTAGE MARGINING USING THE PMBUS

The module can also have its output voltage margined via PMBus commands. The command VOUT_MARGIN_HIGH sets the margin high

voltage, while the command VOUT_MARGIN_LOW sets the margin low voltage. Both the VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW

commands use the “Linear” mode with the exponent fixed at –10 (decimal). Two bytes are used for the mantissa with the upper bit [7] of the high

byte fixed at 0. The actual margined output voltage is a combination of the VOUT_MARGIN_HIGH or VOUT_MARGIN_LOW and the

VOUT_TRIM values as shown below:

Note that the sum of the margin and trim voltages cannot be outside the ±25% window around the nominal output voltage. The data associated

with VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW can be stored to non-volatile memory using the STORE_DEFAULT_ALL command.

The module is commanded to go to the margined high or low voltages using the OPERATION command. Bits [5:2] are used to enable margining

as follows:

00XX : Margin Off

0101 : Margin Low (Ignore Fault)

0110 : Margin Low (Act on Fault)

1001 : Margin High (Ignore Fault)

1010 : Margin High (Act on Fault)

45. PMBUS ADJUSTABLE OVERCURRENT WARNING

The SLDM-06D1Ax module can provide an overcurrent warning via the PMBus. The threshold for the overcurrent warning can be set using the

parameter IOUT_OC_WARN_LIMIT. This command uses the “Linear” data format with a two byte data word where the upper five bits [7:3] of the

high byte represent the exponent and the remaining three bits of the high byte [2:0] and the eight bits in the low byte represent the mantissa. The

exponent is fixed at –1 (decimal). The upper six bits of the mantissa are fixed at 0 while the lower five bits are programmable with a default value

of 7A. The resolution of this warning limit is 500mA. The value of the IOUT_OC_WARN_LIMIT can be stored to non-volatile memory using the

STORE_DEFAULT_ALL command.

46. TEMPERATURE STATUS VIA PMBUS

The SLDM-06D1Ax module can provide information related to temperature of the module through the STATUS_TEMPERATURE command. The

command returns information about whether the pre-set over temperature fault threshold and/or the warning threshold have been exceeded.

10

)

(

2

)

_

_

_

(









TRIM

VOUT

HIGH

MARGIN

VOUT

V

MH

OUT

10

)

(

2

)

_

_

_

(









TRIM

VOUT

LOW

MARGIN

VOUT

V

ML

OUT