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R =10k x
SET
W
0.8V
-R k
S
W
V -V
O min
(1)
PTH12010W , PTH12010L
SLTS205G – JUNE 2003 – REVISED FEBRUARY 2007
Use Equation 1 to calculate the adjust resistor value. See Table 2 for the parameters, R
S
and V
min
.
Table 2. Adjust Formula Parameters
PARAMETER PTH12010W PTH12010L
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
Table 3. Output Voltage Set-Point Resistor Values
PTH12010W PTH12010L
V
O
(V) R
SET
(k Ω ) V
O
(V) R
SET
(k Ω ) V
O
R
SET
(k Ω )
1.2 Open 2.7 3.51 0.8 Open
1.225 318 2.75 3.34 0.825 312
1.25 158 2.8 3.18 0.85 152
1.275 105 2.85 3.03 0.875 98.8
1.3 78.2 2.9 2.89 0.9 72.1
1.325 62.2 2.95 2.75 0.925 56.1
1.35 51.5 3 2.62 0.95 45.5
1.375 43.9 3.05 2.5 0.975 37.8
1.4 38.2 3.1 2.39 1 32.1
1.425 33.7 3.15 2.28 1.025 27.7
1.45 30.2 3.2 2.18 1.05 24.1
1.475 27.3 3.25 2.08 1.075 21.2
1.5 24.8 3.3 1.99 1.1 18.8
1.55 21 3.35 1.90 1.125 16.7
1.6 18.2 3.4 1.82 1.15 15
1.65 16 3.5 1.66 1.175 13.5
1.7 14.2 3.6 1.51 1.2 12.1
1.75 12.7 3.7 1.38 1.225 11
1.8 11.5 3.8 1.26 1.25 9.91
1.85 10.5 3.9 1.14 1.275 8.97
1.9 9.61 4 1.04 1.3 8.13
1.95 8.85 4.1 0.939 1.325 7.37
2 8.18 4.2 0.847 1.35 6.68
2.05 7.59 4.3 0.761 1.375 6.04
2.1 7.07 4.4 0.680 1.4 5.46
2.15 6.6 4.5 0.604 1.425 4.93
2.2 6.18 4.6 0.533 1.45 4.44
2.25 5.80 4.7 0.466 1.475 3.98
2.3 5.45 4.8 0.402 1.5 3.56
2.35 5.14 4.9 0.342 1.55 2.8
2.4 4.85 5 0.285 1.6 2.13
2.45 4.58 5.1 0.231 1.65 1.54
2.5 4.33 5.2 0.180 1.7 1.02
2.55 4.11 5.3 0.131 1.75 0.551
2.6 3.89 5.4 0.085 1.8 0.130
2.65 3.70 5.5 0.041
9
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