JNW350R641 Datasheet, PDF (9/15 Pages) Lineage Power Corporation – 36 - 75 Vdc Input; 28Vdc Output; 350W Output

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