JHW250S30R21-18T Datasheet, PDF (9/14 Pages) Lineage Power Corporation – 36 - 75 Vdc Input; 30.2Vdc Output; 250W

Data Sheet
October 6, 2005
JHW250S30R2 Power Module; dc-dc Converter
36 – 75 Vdc Input; 30.2Vdc Output; 250W
taken to ensure that the maximum output power of the
module remains at or below the maximum rated power.
Where,
V_O = Desired output voltage set point (V).
Figure 17. Effective Circuit Configuration for Single-
Module Remote-Sense Operation Output Voltage
Output Voltage Set-Point Adjustment
(Trim)
Trimming 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 18). The following
equation determines the required external-resistor value
to obtain a desired output voltage.
The voltage between the Vo(+) and Vo(-) terminals must
not exceed the minimum output overvoltage shut-down
value indicated in 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 17.
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.
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.
Trim down for output voltages: 30.2V
Radj
−
down
=
10
×
[(2 ×Vo) − 30.2]
(30.2 −Vo)
KΩ
Where,
V_O = Desired output voltage set point (V).
Figure 18. Circuit Configuration to Decrease Output
Voltage
With an external resistor connected between the TRIM
and SENSE(+) pins (Radj-up), the output voltage set
point (Vo,adj) increases (see Figure 19).
The following equation determines the required external-
resistor value to obtain a desired output voltage.
Trim up for output voltages: 30.2V
Radj
−
up
=
⎡
⎢^{9 .5944}
⎣
×
⎜⎜⎝⎛
(0.04056
Vo
× Vo)
−
1.225
⎟⎟⎠⎞⎥⎦⎤
−
10
KΩ
Figure 19. Circuit Configuration to Increase Output
Voltage
Tyco Electronics Power Systems
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