FC250R datasheet(8/20 Pages) MACOM

Part #	FC250R

Description	Power Module:dc-dc Converter; 18 Vdc to 36 Vdc Input, 28 Vdc Output; 250 W

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Manufacturer	MACOM [Tyco Electronics]

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8

Tyco Electronics Corp.

Data Sheet

May 1999

dc-dc Converter; 18 Vdc to 36 Vdc Input, 28 Vdc Output; 250 W

FC250R Power Module:

Feature Descriptions (continued)

Remote On/Off

To turn the power module on and off, the user must

supply a switch to control the voltage between the on/off

terminal and the VI(–) terminal (Von/off). The switch can be

an open collector or equivalent (see Figure 11). A logic

low is Von/off = 0 V to 1.2 V, during which the module is on.

The maximum Ion/off during a logic low is 1 mA. The switch

should maintain a logic-low voltage while sinking 1 mA.

During a logic high, the maximum Von/off generated by

the power module is 15 V. The maximum allowable

leakage current of the switch at Von/off = 15 V is 50 µA.

If not using the remote on/off feature, short the

ON/OFF pin to VI(–).

8-580 (C).d

Figure 11. Remote On/Off Implementation

Remote Sense

Remote sense minimizes the effects of distribution

losses by regulating the voltage at the remote-sense

connections. The voltage between the remote-sense

pins and the output terminals must not exceed the out-

put voltage sense range given in the Feature Speciﬁca-

tions table, i.e.:

[VO(+) – VO(–)] – [SENSE(+) – SENSE(–)]

≤ 0.5 V

The voltage between the VO(+) and VO(–) terminals

must not exceed the minimum value indicated in the

output overvoltage shutdown section of the Feature

Speciﬁcations table. This limit includes any increase in

voltage due to remote-sense compensation and output

voltage set-point adjustment (trim), see Figure 12.

If not using the remote-sense feature to regulate the out-

put at the point of load, connect SENSE(+) to VO(+) and

SENSE(–) to VO(–) at the module.

8-651 (C).e

Figure 12. Effective Circuit Conﬁguration for

Single-Module Remote-Sense Operation

Output Voltage Set-Point Adjustment (Trim)

Output voltage trim allows the user to increase or

decrease the output voltage set point of a module. This

is accomplished by connecting an external resistor

between the TRIM pin and either the SENSE(+) or

SENSE(–) pins. The TRIM resistor should be posi-

tioned close to the module.

If not using the trim feature, leave the TRIM pin open.

With an external resistor between the TRIM and

SENSE(–) pins (Radj-down), the output voltage set point

(VO, adj) decreases (see Figure 13). The following equa-

tion determines the required external-resistor value to

obtain a percentage output voltage change of

∆%.

The test results for this conﬁguration are displayed in

Figure 14. This ﬁgure applies to all output voltages.

With an external resistor connected between the TRIM

and SENSE(+) pins (Radj-up), the output voltage set

point (VO, adj) increases (see Figure 15).

Note: The output voltage of this module may be

increased to a maximum of 0.5 V. The 0.5 V is

the combination of both the remote sense and

the output voltage set-point adjustment (trim).

Do not exceed 28.5 V between the VO(+) and

VO(–) terminals.

The following equation determines the required exter-

nal-resistor value to obtain a percentage output voltage

change of

∆%.

Only trim up to 0.5 V maximum; see note above.

+

Ion/off

–

Von/off

CASE

ON/OFF

VI(+)

VI(–)

SENSE(+)

SENSE(–)

VO(+)

VO(–)

VO(+)

SENSE(+)

SENSE(–)

VO(–)

VI(+)

VI(–)

IO

LOAD

CONTACT AND

DISTRIBUTION LOSSES

SUPPLY

II

CONTACT

RESISTANCE

Radj-down

205

∆%

----------

2.255

–



 kΩ

=

Radj-up

VO 100

∆%

+

()

1.225

∆%

---------------------------------------

100

2

∆%

+

()

∆%

----------------------------------

–





=

k

Ω

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