Datasheet

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Equation 1. Output Voltage Adjust
R
set
+ 10 kW
0.8 V
V
out
* V
min
* R
S
kW
PTH12050W/L
SLTS214H – MAY 2003 – REVISED OCTOBER 2007
Use Equation 1 to calculate the adjust resistor value. See Table 2 for parameters, R
s
and V
min
.
Table 2. Adjust Formula Parameters
OUTPUT VOLTAGE ADJUST EQUATION Parameter PTH12050W PTH12050L
V
(MIN)
1.2 V 0.8 V
V
(MAX)
5.5 V 1.8 V
R
S
1.82 k Ω 7.87 k Ω
(1)
Table 3. Output Voltage Set-Point Resistor Values
PTH12050W PTH12050L
V
O
(V) R
SET
(k Ω ) V
O
(V) R
SET
(k Ω ) V
O
(V) R
SET
(k Ω )
1.200 Open 2.7 3.51 0.8 Open
1.225 318 2.75 3.34 0.825 312
1.250 158 2.8 3.18 0.85 152
1.275 105 2.85 3.03 0.875 98.8
1.300 78.2 2.9 2.89 0.9 72.1
1.325 62.2 2.95 2.75 0.925 56.1
1.350 51.1 3.0 2.62 0.95 45.5
1.375 43.9 3.05 2.49 0.975 37.8
1.400 38.2 3.1 2.39 1.0 32.1
1.425 33.7 3.15 2.27 1.025 27.7
1.450 30.2 3.2 2.18 1.05 24.1
1.475 27.3 3.25 2.08 1.075 21.2
1.50 24.8 3.3 1.99 1.1 18.8
1.55 21 3.35 1.91 1.125 16.7
1.60 18.2 3.4 1.82 1.15 15
1.65 16 3.5 1.66 1.175 13.5
1.70 14.2 3.6 1.51 1.2 12.1
1.75 12.7 3.7 1.38 1.225 11
1.80 11.5 3.8 1.26 1.25 9.91
1.85 10.5 3.9 1.14 1.275 8.97
1.90 9.61 4.0 1.04 1.3 8.13
1.95 8.85 4.1 0.939 1.325 7.37
2.00 8.18 4.2 0.847 1.35 6.68
2.05 7.59 4.3 0.761 1.375 6.04
2.10 7.07 4.4 0.680 1.4 5.46
2.15 6.6 4.5 0.604 1.425 4.93
2.20 6.18 4.6 0.533 1.45 4.44
2.25 5.8 4.7 0.466 1.475 3.98
2.30 5.45 4.8 0.402 1.5 3.56
2.35 5.14 4.9 0.342 1.55 2.8
2.40 4.85 5.0 0.285 1.6 2.13
2.45 4.58 5.1 0.231 1.65 1.54
2.50 4.33 5.2 0.180 1.7 1.02
2.55 4.11 5.3 0.131 1.75 0.551
2.60 3.89 5.4 0.085 1.8 0.130
2.65 3.7 5.5 0.041
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