Rev. 3.1

2/2011

Page 3 of 18

V•I CHIP CORP. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200

vicorpower.com

x 120

025A00

y

E

48

VTM

SIGNAL TYPE

STATE

ATTRIBUTE

SYMBOL

CONDITIONS / NOTES

MIN

TYP

MAX UNIT

External VC voltage

Required for start up, and operation

11.5

16.5

V

below 26 V. See Section 7.

115

150

VC current draw

0

mA

0

Steady

Fault mode. VC > 11.5 V

60

ANALOG

VC internal diode rating

100

V

INPUT

VC internal resistor

0.511

k

Ω

VC internal resistor

T

VC

900 ppm/°C

temperature coefficient

Start Up

VC start up pulse

Tpeak <18 ms

20

V

VC slew rate

dVC/dt

Required for proper start up;

0.02

0.25

V/µs

VC inrush current

VC = 16.5 V, dVC/dt = 0.25 V/µs

1

A

500

µs

Transitional

VC to PC delay

Tvc_pc

75

125

µs

dVC/dt = 0.25 V/µs

Internal VC capacitance

VC = 0 V

3.2

µF

• Used to wake up powertrain circuit.

to ensure normal operation.

• VC slew rate must be within range for a succesful start.

• PRM VC can be used as valid wake-up signal source.

• Internal Resistance used in “Adaptive Loop” compensation

• VC voltage may be continuously applied

VTM CONTROL : VC

3.0 SIGNAL CHARACTERISTICS

Specifications apply over all line and load conditions unless otherwise noted; Boldface specifications apply over the temperature

SIGNAL TYPE

STATE

ATTRIBUTE

SYMBOL

CONDITIONS / NOTES

MIN

TYP

MAX UNIT

PC voltage

4.7

5

5.3

V

ANALOG

Steady

PC source current

2mA

OUTPUT

PC resistance (internal)

Internal pull down resistor

50

150

400

k

Ω

Start Up

PC source current

50

100

300

µA

PC capacitance (internal)

Section 7

1000

pF

PC resistance (external)

60

k

Ω

Enable

PC voltage

2

2.5

3

V

DIGITAL

Disable

PC voltage (disable)

2

V

INPUT / OUPUT

PC pull down current

5.1

mA

Transitional

PC disable time

5µs

PC fault response time

From fault to PC = 2 V

100

µs

• The PC pin enables and disables the VTM.

When held below 2 V, the VTM will be disabled.

• PC pin outputs 5 V during normal operation. PC pin is equal to 2.5 V

• After successful start up and under no fault condition, PC can be used as

a 5 V regulated voltage source with a 2 mA maximum current.

• Module will shutdown when pulled low with an impedance

less than 400

Ω.

• In an array of VTMs, connect PC pin to synchronize start up.

• PC pin cannot sink current and will not disable other modules

during fault mode.

PRIMARY CONTROL : PC