Rev 1.7

vicorpower.com

Page 10 of 25

07/2015

800 927.9474

Rev 1.7

vicorpower.com

Page 10 of 25

07/2015

800 927.9474

BCM380x475y1K2A3z

Signal Characteristics

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

Temperature Monitor

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

• The TM pin monitors the internal temperature of the controller IC within an accuracy of ±5°C.

• µC 250 kHz PWM output internally pulled high to 3.3 V.

SIGNAL TYPE

STATE

ATTRIBUTE

SYMBOL

CONDITIONS / NOTES

MIN

TYP

MAX

UNIT

DIGITAL

OUTPUT

Startup

Powertrain active to TM

time

100

µs

Regular

Operation

TM Duty Cycle

18.18

68.18

%

TM Current

4

mA

Recommended External filtering

TM Capacitance (External)

Recommended External filtering

0.01

µF

TM Resistance (External)

Recommended External filtering

1

kΩ

Specifications using recommended filter

TM Gain

10

mV / °C

TM Voltage Reference

1.27

V

TM Voltage Ripple

28

mV

40

Enable / Disable Control

• The EN pin is a standard analog I/O configured as an input to an internal µC.

• It is internally pulled high to 3.3 V.

• When held low the BCM internal bias will be disabled and the powertrain will be inactive.

• In an array of BCMs, EN pins should be interconnected to synchronize startup and permit startup into full load conditions.

SIGNAL TYPE

STATE

ATTRIBUTE

SYMBOL

CONDITIONS / NOTES

MIN

TYP

MAX

UNIT

ANALOG

INPUT

Startup

EN to Powertrain active

time

250

µs

Regular

Operation

EN Voltage Threshold

2.3

V

EN Resistance (Internal)

Internal pull up resistor

1.5

kΩ

EN Disable Threshold

1

V