Application Notes
PT6940 Series
Table 1
ADJUSTMENT RANGE AND FORMULA PARAMETERS
Vo1 Bus
Vo2 Bus (2)
PT6941
(R3)/R4
Series Pt #
Adj. Resistor
PT6941/42/43/44
(R1)/R2
PT6946/47/48
(R1)/R2
PT6942/46
(R3)/R4
PT6943/47
(R3)/R4
PT6944/48
(R3)/R4
Vo(nom)
Va(min)
Va(max)
Rs (kΩ)
3.3V
2.5V
2.5V
1.8V
1.5V
1.2V
1.15V
1.5V †
29.4
*
*
*
*
*
2.5V
1.8V
1.8V
1.5V
1.2V
3.5V
20.0
2.5V
13.0
3.1V
13.0
2.2V
20.0
2.4V
10.0
Ref. Note 4:
* (R1) = Zero-ohm link
†(R3) = Zero-ohm link
Table 2
ADJUSTMENT RESISTOR VALUES
Vo1 Bus
Vo2 Bus
Series Pt #
Adj. Resistor
PT6941/42/43/44
(R1)/R2
PT6946/47/48
(R1)/R2
Series Pt #
Adj. Resistor
PT6941
(R3)/R4
PT6942/46
(R3)/R4
PT6943/47
(R3)/R4
PT6944/48
(R3)/R4
Vo(nom)
3.3V
2.5V
Vo(nom)
2.5V
1.8V
1.5V
1.2V
Va(req’d)
Va(req’d)
1.15
(20.6)kΩ
1.8
(0.0)
1.2
1.25
1.3
1.35
1.4
1.45
1.5
1.55
1.6
1.65
1.7
1.75
1.8
1.85
1.9
1.95
2.0
2.05
2.1
2.15
2.2
2.25
2.3
2.35
2.4
2.45
2.5
(0.0)kΩ
(4.0)kΩ
(10.0)kΩ
(20.0)kΩ
(40.0)kΩ
(100.0)kΩ
1.85
1.9
1.95
2.0
2.05
2.1
2.15
2.2
2.25
2.3
2.35
2.4
2.45
2.5
2.55
2.6
2.65
2.7
2.75
2.8
2.85
2.9
2.95
3.0
(1.6)kΩ
(3.7)kΩ
(6.1)kΩ
(9.0)kΩ
(12.6)kΩ
(17.0)kΩ
(22.7)kΩ
(30.3)kΩ
(41.0)kΩ
(57.0)kΩ
(83.7)kΩ
(137.0)kΩ
(297.0)kΩ
151.0kΩ
60.6kΩ
30.6kΩ
15.6kΩ
6.6kΩ
(0.0)kΩ
(6.0)kΩ
(15.0)kΩ
(30.0)kΩ
(60.0)kΩ
(150.0)kΩ
0.0kΩ
170.0kΩ
80.0kΩ
50.0kΩ
35.0kΩ
26.0kΩ
19.6kΩ
15.7kΩ
12.5kΩ
10.0kΩ
8.0kΩ
6.4kΩ
5.0kΩ
3.9kΩ
2.9kΩ
2.0kΩ
1.3kΩ
0.6kΩ
0.0kΩ
(0.0)kΩ
(1.6)kΩ
(3.7)kΩ
(6.1)kΩ
(9.0)kΩ
(12.6)kΩ
(17.0)kΩ
(22.7)kΩ
(30.3)kΩ
(41.0)kΩ
(57.0)kΩ
(83.7)kΩ
(137.0)kΩ
(297.0)kΩ
160.0kΩ
70.0kΩ
40.0kΩ
25.0kΩ
16.0kΩ
10.0kΩ
5.7kΩ
(0.0)kΩ
(2.0)kΩ
(4.3)kΩ
167.0kΩ
77.0kΩ
47.0kΩ
32.0kΩ
23.0kΩ
#
#
#
#
#
(6.9)kΩ
(10.0)kΩ
(13.6)kΩ
(18.0)kΩ
(23.3)kΩ
(30.0)kΩ
(38.6)kΩ
(50.0)kΩ
(90.0)kΩ
(210.0)kΩ
2.5kΩ
3.1
3.2
3.3
2.55
2.6
2.65
2.7
2.75
2.8
2.85
2.9
167.0kΩ
77.0kΩ
47.0kΩ
32.0kΩ
23.0kΩ
17.0kΩ
12.7kΩ
9.5kΩ
3.4
3.5
3.6
3.7
70.0kΩ
25.0kΩ
10.0kΩ
2.5kΩ
2.95
3.0
7.0kΩ
5.0kΩ
3.1
2.0kΩ
R1/R3 = (Blue), R2/R4 = Black
# See Note 3
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