Vicor Corporation

Tel: 800-735-6200

V•I Chip Bus Converter

B048K120T20

Rev. 2.2

Page 1 of 16

vicorpower.com

Product Description

The V•I Chip Bus Converter Module

(BCM) is a high efficiency (>96%),

narrow input range Voltage

Transformation Module (VTM) operating

from a 48 Vdc bus to deliver an isolated

12 V secondary for Intermediate Bus

Architecture applications. The BCM may

be used to power non-isolated POL

converters or as an independent 12 V

source. Due to the fast response time and

low noise of the BCM, the need for

limited life aluminum electrolytic or

tantalum capacitors at the input of POL

converters is reduced—or eliminated—

resulting in savings of board area,

materials and total system cost.

The BCM achieves a power density of

800 W/in

with a profile as low as 0.16" (4mm) over

the PCB. Its V•I Chip power package is

compatible with on-board or in-board

surface mounting. The V•I Chip package

provides flexible thermal management

through its low Junction-to-Case and

Junction-to-BGA thermal resistance.

Owing to its high conversion efficiency

and safe operating temperature range, the

BCM does not require a discrete heat sink

in typical applications. It is also

compatible with heat sink options,

assuring low junction temperatures and

long life in the harshest environments.

Absolute Maximum Ratings

Parameter

Values

Unit

Notes

+In to -In

-1.0 to 60.0

Vdc

+In to -In

100

Vdc

For 100 ms

PC to -In

-0.3 to 7.0

Vdc

TM to -In

-0.3 to 7.0

Vdc

+Out to -Out

-0.5 to 15.0

Vdc

Isolation voltage

2250

Vdc

Input to Output

Operating junction temperature

-40 to 125

°C

T grade; See note 2

Output current

17.0

A

Continuous

Peak output current

25

A

For 1 ms

Case temperature during reflow

208

°C

Storage temperature

-40 to 150

°C

Output power

200

W

Continuous

Peak output power

300

W

For 1 ms

Thermal Resistance

Symbol

Parameter

Typ

Max

Units

R

θJC

Junction-to-case

1.1

1.5

°C/W

R

θJB

Junction-to-BGA

2.1

2.5

°C/W

R

θJA

6.5

7.2

°C/W

R

θJA

5.0

5.5

°C/W

• 48 V to 12 V V•I Chip Converter

• 200 Watt (300 Watt for 1 ms)

• Low weight – 0.5 oz (14 g)

• ZVS/ZCS isolated sine

amplitude converter

• >96% efficiency

• 125°C operation

•1 µs transient response

• >3.5 million hours MTBF

• No output filtering required

• BGA or J-Lead packages

B048K120T20

1

+

–

V•I

K

+

–

Vin = 42 - 53 V

Vout = 10.5 - 13.25 V

Iout = 17.0 A

Rout = 25 m

Ω max

Notes

1. For complete product matrix see chart on page 10.

2. The referenced junction is defined as the semiconductor having the highest temperature. This

temperature is monitored by the temperature monitor (TM) signal and by a shutdown comparator.

3. B048K120T20 surface mounted in-board to a 2" x 2" FR4 board, 4 layers 2 oz Cu, 300 LFM.

4. B048L120T20 (0.25"H optional Pin Fins) surface mounted on FR4 board, 300 LFM.

Actual size

©

Bus Converter Module