Rev 1.1

vicorpower.com

Page 11 of 26

09/2015

800 927.9474

NBM6123x46C15A6yzz

Auxiliary Voltage Source

• The VAUX pin is a standard analog I/O configured as an output from an internal µC.

• VAUX is internally connected to µC output as internally pulled high to a 3.3 V regulator with 2% tolerance, a 1% resistor of 1.5 kΩ.

• VAUX can be used as a "Ready to process full power" flag. This pin transitions VAUX voltage after a 2 ms delay from the start of powertrain activating,

signaling the end of softstart.

• VAUX can be used as "Fault flag". This pin is pulled low internally when a fault protection is detected.

SIGNAL TYPE

STATE

ATTRIBUTE

SYMBOL

CONDITIONS / NOTES

MIN

TYP

MAX

UNIT

ANALOG

OUTPUT

Startup

Powertrain active to VAUX

time

Powertrain active to VAUX High

2

ms

Regular

Operation

VAUX Voltage

2.8

3.3

V

VAUX Available Current

4

mA

VAUX Voltage Ripple

50

mV

100

VAUX Capacitance

(External)

0.01

µF

VAUX Resistance (External)

1.5

kΩ

Fault

VAUX Fault Response Time

10

µs

Signal Characteristics (Cont.)

Specifications apply over all line, load conditions, unless otherwise noted;

Signal Ground

• Signal ground is internally connect to PGND through a zero ohm resistor.

• Internal SGND traces are not designed to support high current.