JW050F1 datasheet(11/20 Pages) LINEAGEPOWER

Part #	JW050F1

Description	dc-dc Converters; 36 to 75 Vdc Input, 3.3 Vdc Output; 33 W to 99 W

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Manufacturer	LINEAGEPOWER [Lineage Power Corporation]

Direct Link	http://www.lineagepower.com

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11 / 20 page

Lineage Power

11

Data Sheet

April 2008

dc-dc Converters; 36 to 75 Vdc Input, 3.3 Vdc Output; 33 W to 99 W

JW050F, JW075F, JW100F, JW150F Power Modules:

Feature Descriptions (continued)

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(–)] ð 0.5 V

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

must not exceed the minimum value of the output over-

voltage protection. This limit includes any increase in

voltage due to remote-sense compensation and output

voltage set-point adjustment (trim). See Figure 21.

If not using the remote-sense feature to regulate the

output at the point of load, then connect SENSE(+) to

VO(+) and SENSE(–) to VO(–) at the module.

Although the output voltage can be increased by both

the remote sense and by the trim, the maximum

increase for the output voltage is not the sum of both.

The maximum increase is the larger of either the

remote sense or the trim. Consult the factory if you

need to increase the output voltage more than the

above limitation.

The amount of power delivered by the module is defined

as the voltage at the output terminals multiplied by the

output current. When using remote sense and trim, the

output voltage of the module can be increased, which at

the same output current would increase the power output

of the module. Care should be taken to ensure that the

maximum output power of the module remains at or

below the maximum rated power.

VO(+)

SENSE(+)

SENSE(–)

VO (–)

VI(+)

VI(–)

IO

LOAD

CONTACT AND

DISTRIBUTION LOSSES

SUPPLY

II

CONTACT

RESISTANCE

8-651 (C).m

Figure 21. 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 positioned

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 22). The following equa-

tion determines the required external-resistor value to

obtain a percentage output voltage change of ý%.

Radj-down

100

Δ%

----------2

–

⎝⎠

⎛⎞ kΩ

=

The test results for this configuration are displayed in

Figure 23. 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 24).

The following equation determines the required exter-

nal-resistor value to obtain a percentage output voltage

change of ý%.

Radj-up

VO 100 Δ%

+

()

1.225

Δ%

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

100 2

Δ%

+

()

Δ%

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

–

⎝⎠