JHW050FG Datasheet, PDF (10/17 Pages) Lineage Power Corporation – JHW050 Dual Positive Output-Series Power Modules dc-dc Converter: 36 Vdc to 75 Vdc Input, Dual Positive Outputs 50W

JHW050 Dual Positive Output-Series Power Modules: dc-dc
Converter: 36 Vdc to 75 Vdc Input, Dual Positive Outputs; 50W
Data Sheet
April 2008
Feature Descriptions (continued)
Output Voltage Set-Point Adjustment
(Trim)
Trimming allows the output voltage set point to be
increased or decreased, this accomplished by connect-
ing an external resistor between the TRIM pin and
either the VO(+) pin or the COM pin (see Figure 19).
To maintain set point accuracy, the trim resistor toler-
ance should be ± 0.1%.
VI(+)
VO(+)
ON/OFF
VOTRIM
Rtrim-up
LOAD
Rtrim-down
VI(-)
VO(-)
Figure 19.Circuit Configuration to Trim Output
Voltage
VO1 Set-Point Adjustment (Trim)
The Trim equations shown below can be used for all
module variants VO1.
Δ% is the desired % change in VO1.
VO1 refers to the nominal output voltage for the output
being trimmed.
Vref = 2.5 for JHW050AF, and 1.225 for all others.
VO2 Set-Point Adjustment (Trim)
Due to internal component values within each JHW050
variant, the VO2 trim laws are different for each type.
Care should be taken to ensure that the correct law as
shown below is being used.
JHW050AF VO2 Trim
The following equations apply only to the JHW050AF
VO2.
V _{o 2} _R _{trim_down} :
=
⎛
⎝
5-_{Δ---1-%--1--}
–
6.11_⎠⎞
KΩ
V_O2_R_{trim_up}: = ^{5----.--1---1-----â‹}---V--V--^O---_r2-_e---_f^â‹--_â‹-⁽--_Δ^{1----0%---0-----+}-----^Δ----%------⁾ – ^5-_Δ---1-%--1-- – 6.11 KΩ
JHW050FG VO2 Trim
the following equations apply only to the JHW050FG
VO2.
V_O2_R_{trim_down}: = _{9-4---20---9-.-8--.-5-7----–}-^â‹---V3----.^O--7-²--1--^â‹-5--⁽--1-_â‹---0V---0-_O----₂^–---_â‹-^Δ--₍---%1---0--⁾--0--⁺--_–---2--_Δ-0---%2----6--₎ KΩ
V_O2_R_{trim_up}: = -36---.-2-7--.-18---5-5----_â‹-^â‹--V-V---_O-^O---₂₂---_â‹-^â‹--₍-⁽--11---0-0---00----₊-⁺----_Δ-^Δ---%-%-----₎-⁾---_–+----9-2--2-9---9-5--.-5-5- – 1 KΩ
JHW050FY VO2 Trim
The following equations apply only to the JHW050FY
VO2.
V_O1_R_{trim_down}: = _⎝⎛-5_Δ---1-%--1-- – 10.22_⎠⎞ KΩ
V_O2_R_{trim_down}: = _{8-5---41---9-.-9--.-6-1----–}-^â‹---V4----.^O--7-²--1--^â‹-9--⁽--1-_â‹---0V---0-_O----₂^–---_â‹-^Δ--₍---%1---0--⁾--0--⁺--_–---2--_Δ-9---%0----4--₎ KΩ
V_O1_R_{trim_up}: = ^{5----.-1----1-----â‹}---V--V--^O---_r1-_e---_f^â‹--_â‹-⁽--_Δ-1---0%---0-----⁺-----^Δ----%------⁾ – ^5-_Δ---1-%--1-- – 10.22 KΩ
Example: For JHW050AF, to trim up to 5.25 V, Δ% = 5,
nominal VO1 = 5.0, use Vref = 2.5.
V_O2_R_{trim_up}: = _{4-5---.-2-7--.-1-8--9-1----â‹}-^â‹--V-V---_O-^O---₂-²--_â‹-^â‹--₍-⁽--1-1--0-0---00----₊-⁺----_Δ-^Δ---%-%-----₎-⁾---_––----8-3--4-7---9-5--.-3-6- – 1 KΩ
If not using the trim feature, leave each TRIM pin
unconnected.
Hence Rtrim_up = 102.2 KΩ.
The table below shows trim resistance values to adjust VO2 down to a range of popular nominal voltages.
AF - Nom VO2 = 3.3V FG - Nom VO2 = 2.5V FY - Nom VO2 = 1.8V
VO2 Trim
VO2 Trim
VO2 Trim
2.50 14.97kΩ 2.00 54.69kΩ 1.5 75.42kΩ
2.00 6.86kΩ 1.80 35.98kΩ 1.40 53.84kΩ
1.80 5.13kΩ 1.50 21.91kΩ 1.20 32.24kΩ
1.50 3.26kΩ
—
—
1.00 21.43kΩ
10
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