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TPS65552ADGQR Fiches technique(PDF) 8 Page - Texas Instruments |
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TPS65552ADGQR Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 16 page www.ti.com t = N_TURN x L OFF I PEAK V OUT ÷ ÷ ø ö ç ç è æ (2) Reference Voltage Termination Voltage Setting TPS65552A SLVS567 – JULY 2005 The TPS65552A does not have its own reference voltage circuit inside, and the TPS65552A uses the VCC input voltage as a reference to detect I(PEAK), V(ZERO), and V(FULL). Therefore, voltage input at VCC is approximately 5 V. VCC differs from 5 V by system limitations. Table 1 shows the dependence of each function of TPS65552A to VCC. Table 1. VCC Dependence of TPS65552A PARAMETER EQUATION VCC 4.5 5 5.5 I(PEAK1) 0.52 x VCC - 0.92 1.42 1.68 1.94 I(PEAK2) 0.24 x VCC - 0.33 0.75 0.87 0.99 V(FULL) TPS65552A 5.8 x VCC 26.1 29.0 31.9 over VDS 0.24 x VCC 1.08 1.2 1.32 To obtain a different termination voltage, transformers of different turn ratio are required. Table 2 shows the matrix of termination voltage and the turn ratio of the transformer. The table only shows a ONE to integer ratio while there are no limitations for a turn ratio of the transformer in a real application circuit, example 1:10.5 (= 10:105). Table 2. Termination Voltage Setting Table TPS65552A 29 [V] 1:10 290 1:11 319 1:12 348 8 Not Recommended for New designs |
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