IBC MODULE

Rev 1.8

vicorpower.com

Page 10 of 14

11/2012

800 735.6200

IB048Q096T70N1-00

+In / -In – DC Voltage Input Pins

The IBC input voltage range should not be exceeded. An internal

undervoltage / overvoltage lockout function prevents operation outside of

the normal operating input range. The IBC 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 IBC 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 IBC 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

μFinserieswith0.3Ω.Asingle

electrolytic or equivalent low-Q capacitor may be used in place of the series

RC bypass.

EN - Enable/Disable

Negative Logic Option

If the EN port is left floating, the IBC output is disabled. Once this port is-

pulled lower than 0.8 Vdc with respect to –In, the output is enabled. The

EN port can be driven by a relay, opto-coupler, or open collector transistor.

Refer to Figures 6 and 7 for the typical enable / disable characteristics. This

port should not be toggled at a rate higher than 1 Hz. The EN port should

also not be driven by or pulled up to an external voltage source.

Positive Logic Option

If the EN port is left floating, the IBC output is enabled. Once this port is

pulled lower than 1.4 Vdc with respect to –In, the output is disabled. This

action can be realized by employing a relay, opto-coupler, or open collector

transistor. This port should not be toggled at a rate higher than 1 Hz.

The EN port should also not be driven by or pulled up to an external volt-

age source. The EN port can source up to 2 mA at 5 Vdc. The EN port

should never be used to sink current.

If the IBC is disabled using the EN pin, the module will attempt to restart

approximately every 250ms. Once the module has been disabled for at least

250ms, the turn on delay after the EN pin is enabled will be as shown in

Figure 7.

+Out / -Out – DC Voltage Output Pins

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

specified maximum. Owing to the wide bandwidth and low output

impedance of the IBC, low frequency bypass capacitance and significant

energy storage may be more densely and efficiently provided by adding

capacitance at the input of the IBC.

PIN / CONTROL FUNCTIONS

Top View

1

2

3

5

4

Pin

Function

1

Vin+

2

Enable

3

Vin-

4

Vout-

5

Vout+

Figure 30 — IBC Pin Designations