Data Sheet
JNW350R Power Modules; DC-DC Converters
36 – 75 Vdc Input; 28Vdc Output; 350W Output
July 27, 2009
Modules with the –T Option
Feature Description (continued)
The following equation determines the required
external-resistor value to obtain a percentage output
voltage change of Δ%.
Trim Down – Decrease Output Voltage
With an external resistor (Radj-down) between the TRIM
and SENSE(+) pins, the output voltage set point
(Vo,adj) decreases (see Figure 15). The following
equation determines the required external-resistor
value to obtain a percentage output voltage change of
Δ%.
For output voltages: 28V
V
× (100 + Δ%)
⎡
(100 + (2 × Δ%) ⎤
O , nom
R
adj
−
up
=
−
kΩ
⎥
⎢
1.225 × Δ %
Δ%
⎣
⎦
For output voltages: 28V
Where,
10631.45
⎛
⎜
⎞
⎠
V
desired −Vo, nom
R
adj − down
=
−111.2 kΩ
⎟
Δ% =
×100
Δ%
⎝
Vo, nom
Where,
Vdesired = Desired output voltage set point (V).
V
o, nom −Vdesired
Δ% =
×100
V
o, nom
V
desired = Desired output voltage set point (V).
Figure 14. Circuit Configuration to Increase
Output Voltage, Standard JNW350R.
Examples:
Figure 15. Circuit Configuration to Decrease
Output Voltage, JNW350R-T option.
To trim down the output of a nominal 28V module to
16.8V
Trim Up – Increase Output Voltage
28V −16.8V
With an external resistor (Radj-up) connected between
the SENSE(-) and TRIM pins, the output voltage set
Δ% =
×100
28V
point (Vo,ad ) increases (see Figure 16).
j
∆% = 40
The following equation determines the required
external-resistor value to obtain a percentage output
voltage change of Δ%.
100
⎛
⎜
⎞
⎠
R
adj − down
=
− 2 kΩ
⎟
40
⎝
For output voltages: 28V
R
adj - down = 0.5 kΩ
20.47
⎛
⎜
⎞
⎟
To trim up the output of a nominal 28V module to
30.8V
Radj − up
=
kΩ
Δ%
⎝
⎠
Where,
30.8V − 28V
Δ% =
×100
V
desired −Vo, nom
28V
Δ% =
×100
Δ% = 10
V
o, nom
28× (100 +10) (100 + (2×10)
⎡
⎣
⎤
Radj−up
=
−
kΩ
Vdesired = Desired output voltage set point (V).
⎢
⎥
⎦
1.225 ×10
10
Radj - up = 239.4 kꢀ
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9
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