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LSO2802R5DEM Datasheet(PDF) 11 Page - International Rectifier |
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LSO2802R5DEM Datasheet(HTML) 11 Page - International Rectifier |
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11 / 18 page  www.irf.com 11 LSO SERIES 28V Input, Single/Dual Output OVP External Adjustment: Over-voltage Protection threshold of LSO singles and duals can be adjusted to be greater or less the nominal OVP with a couple of external resistors. Lower resistors, R1 and R2 are 10K Ω resistors, while Radj set the new OVP threshold as stated in Table 6 for single output models and Table 7 for dual output models. Ranges of LSO series converter can be adjusted from 115% to 125% of the nominal output voltage. See Fig.8 to place external resistors. An approximate value of the resistor can be determined using the following formula. Where: Radj is the upper external resistor in kilo-ohms, as shown in Fig 8. Power rating of the resistor shall be ≥ 0.125 W. Metal film resistor with temperature coefficient of ≤ ± 50 ppm and tolerance of ≤ 1% is recommended. However, the final selection is dependent on specific design requirements. Vovp is the output voltage protection limit in volts. A, B, C and D are unique constants depending on every model. Placement of Radj: Two external resistors must be added in order to set new OVP threshold. Singles: Radj(OVP) is placed across +Output and OVP Adj pins and R1 from OVP Adj to -Output. Duals: Radj(+OVP) is placed across +Output and +OVP Adj pins and R1 from +OVP Adj to -Return. Radj(-OVP) is placed across +Return and -OVP Adj pins while R2 is placed across -OVP Adj to –Output. Table 7. LSO Duals. OVP Exeternal LSO2805DS LSO2815D Range OVP Radj (K Ω) OVP Radj (K Ω) Vo* (115%) 5.75 26 17.25 101 Vo* (116%) 5.80 28 17.40 107 Vo* (117%) 5.85 30 17.55 113 Vo* (118%) 5.90 33 17.70 121 Vo* (119%) 5.95 36 17.85 128 Vo* (120%) 6.00 39 18.00 137 Vo* (121%) 6.05 43 18.15 146 Vo* (122%) 6.10 47 18.30 157 Vo* (123%) 6.15 51 18.45 169 Vo* (124%) 6.20 57 18.60 183 Vo* (125%) 6.25 64 18.75 199 Fig. 8 - OVP with External Adjustment LSO2803R3S LSO2805S LSO2815S Range OVP Radj (K Ω) OVP Radj (K Ω) OVP Radj (K Ω) Vo* (115%) 3.79 13 5.75 26 17.25 102 Vo* (116%) 3.82 15 5.80 28 17.40 108 Vo* (117%) 3.86 16 5.85 31 17.55 114 Vo* (118%) 3.89 18 5.90 33 17.70 121 Vo* (119%) 3.92 20 5.95 36 17.85 128 Vo* (120%) 3.96 22 6.00 39 18.00 137 Vo* (121%) 3.99 25 6.05 42 18.15 146 Vo* (122%) 4.02 28 6.10 46 18.30 157 Vo* (123%) 4.05 31 6.15 51 18.45 168 Vo* (124%) 4.09 36 6.20 56 18.60 181 Vo* (125%) 4.12 41 6.25 63 18.75 197 Table 6. LSO Singles. OVP Exeternal Stacking Outputs: On dual output models, output can be stacked to double the output voltage as shown in Fig 9. 2XWSXW 5HWXUQ /62;;' 2XWSXW /2$' Fig. 9 - Stacked Outputs on Dual Models P PWQÃ6qw /62;;6 P 5 N P /62;;' PWQÃ6qw PWQÃ6qw Sr
P 5 N N 5 5DGM 293 5DGM 293 6,1*/( '8$/ 5DGM 293 (A V ) R * ovp B adj = - (D V ) ovp C - * |
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