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V•I Chip Bus Converter Module

B048K030T21

Rev. 1.0

Page 7 of 15

V•I Chip Bus Converter Module

PRELIMINARY

Pin/Control Functions

+IN/-IN – DC Voltage Input Ports

The V•I Chip input voltage range should not be exceeded. An internal

under/over voltage lockout-function prevents operation outside of the

normal operating input range. The BCM turns ON within an input

voltage window bounded by the “Input under-voltage turn-on” and

“Input over-voltage turn-off” levels, as specified. The V•I Chip may be

protected against accidental application of a reverse input voltage by

the addition of a rectifier in series with the positive input, or a reverse

rectifier in shunt with the positive input located on the load side of the

input fuse.

The connection of the V•I Chip to its power source should be

implemented with minimal distribution inductance. If the interconnect

inductance exceeds 100 nH, the input should be bypassed with a RC

damper to retain low source impedance and stable operation. With an

interconnect inductance of 200 nH, the RC damper may be 47 µF in

series with 0.3

Ω. A single electrolytic or equivalent low-Q capacitor

may be used in place of the series RC bypass.

PC – Primary Control

The Primary Control port is a multifunction node that provides the

following functions:

Enable/Disable – If the PC port is left floating, the BCM output is

enabled. Once this port is pulled lower than 2.4 Vdc with respect

to –In, the output is disabled. This action can be realized by

employing a relay, opto-coupler, or open collector transistor. Refer

to Figures 1-3, 12 and 13 for the typical Enable/Disable

characteristics. This port should not be toggled at a rate higher

than 1 Hz. The PC port should also not be driven by or pulled up to

an external voltage source.

Primary Auxiliary Supply – The PC port can source up to 2.4 mA at

5.0 Vdc. The PC port should never be used to sink current.

Alarm – The BCM contains circuitry that monitors output overload,

input over voltage or under voltage, and internal junction

temperatures. In response to an abnormal condition in any of the

monitored parameters, the PC port will toggle. Refer to Figure 13

for PC alarm characteristics.

TM and RSV – Reserved for factory use.

+OUT/-OUT – DC Voltage Output Ports

Two sets of contacts are provided for the +Out port. They must be

connected in parallel with low interconnect resistance. Similarly, two

sets of contacts are provided for the –Out port. They must be

connected in parallel with low interconnect resistance. Within the

specified operating range, the average output voltage is defined by the

Level 1 DC behavioral model of Figure 25. The current source capability

of the BCM is rated in the specifications section of this document.

The low output impedance of the BCM reduces or eliminates the need

for limited life aluminum electrolytic or tantalum capacitors at the input

of POL converters.

Total load capacitance at the output of the BCM should not exceed the

specified maximum. Owing to the wide bandwidth and low output

impedance of the BCM, low frequency bypass capacitance and

significant energy storage may be more densely and efficiently provided

by adding capacitance at the input of the BCM.

-In

PC

RSV

TM

+In

-Out

+Out

-Out

+Out

Bottom View

A

B

C

D

E

F

G

H

J

K

L

M

N

P

R

T

U

V

W

Y

AA

AB

AC

AD

AE

AF

AG

AH

AJ

AK

AL

4 3

2 1

A

B

C

D

E

F

G

H

J

K

L

M

N

P

R

T

U

V

W

Y

AA

AB

AC

AD

AE

AF

AG

AH

AJ

AK

AL

Figure 14—BCM BGA configuration

Signal

BGA

Name

Designation

+In

A1-L1, A2-L2

–In

AA1-AL1, AA2-AL2

TM

P1, P2

RSV

T1, T2

PC

V1, V2

+Out

A3-G3, A4-G4,

U3-AC3, U4-AC4

–Out

J3-R3, J4-R4,

AE3-AL3, AE4-AL4