Datasheet

PTH08T220W , PTH08T221W
SLTS252K – NOVEMBER 2005 – REVISED JUNE 2009 ................................................................................................................................................... www.ti.com
Table 2. Output Voltage Set-Point Resistor Values (Standard Values)
V
O
Required R
SET
( Ω ) V
O
Required (V) R
SET
( Ω )
0.70
(1)
681 k 2.50 2.37 k
0.75
(1)
113 k 2.60 2.15 k
0.80
(1)
61.9 k 2.70 2.00 k
0.85
(1)
41.2 k 2.80 1.82 k
0.90
(1)
31.6 k 2.90 1.69 k
0.95
(1)
24.9 k 3.00 1.54 k
1.00
(1)
20.5 k 3.10 1.43 k
1.05
(1)
17.8 k 3.20 1.33 k
1.10
(1)
15.4 k 3.30 1.21 k
1.15
(1)
13.3 k 3.40 1.10 k
1.20
(1)
12.1 k 3.50 1.02 k
1.25 10.7 k 3.60 931
1.30 9.88 k 3.70
(2)
866
1.35 9.09 k 3.80
(2)
787
1.40 8.25 k 3.90
(2)
715
1.45 7.68 k 4.00
(2)
649
1.50 6.98 k 4.10
(2)
590
1.55 6.49 k 4.20
(2)
536
1.60 6.04 k 4.30
(2)
475
1.65 5.76 k 4.40
(2)
432
1.70 5.36 k 4.50
(2)
383
1.75 5.11 k 4.60
(2)
332
1.80 4.75 k 4.70
(2)
287
1.85 4.53 k 4.80
(2)
249
1.90 4.22 k 4.90
(2)
210
1.95 4.02 k 5.00
(2)
169
2.00 3.83 k 5.10
(2)
133
2.10 3.40 k 5.20
(2)
100
2.20 3.09 k 5.30
(2)
66.5
2.30 2.87 k 5.40
(2)
34.8
2.40 2.61 k 5.50
(2)
4.99
(1) For output voltages ≤ 1.2V, at nominal operating frequency, the output ripple may increase (typically
2 × ) when operating at input voltages greater than (V
O
× 11). When using the SmartSync feature,
review the SmartSync application section for further guidance.
(2) For V
O
> 3.6 V, the minimum input voltage is (V
O
+ 2) V.
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