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TPS65552ARGTR Fiches technique(PDF) 9 Page - Texas Instruments |
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TPS65552ARGTR Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 16 page www.ti.com Programming Peak Current 0.80 1 1.20 1.40 1.60 1.80 2 0 0.5 1 1.5 2 2.5 3 3.5 V(I_PEAK) [V] IGBT Driver Control TPS65552A SLVS567 – JULY 2005 The TPS65552A provides a method to program I(PEAK) through the input voltage of the I_PEAK terminal. Figure 7 shows how to program I(PEAK). I_PEAK input is treated as a logic input, when its voltage is below V(PKL) (0.6 V) and above V(PKH) (2.4 V). Between V(PKL) and V(PKH), I_PEAK input is treated as an analog input. Using this characteristic, I(PEAK) can be set by the logic signal or by an analog input. Typical usages of this function are: 1. Charging I(PEAK) depends on the battery voltage. Large I(PEAK) for an adequate battery, small I(PEAK) for a poor battery. 2. Reducing I(PEAK) when zooming lens (motor works); this avoids shutdown of the battery with a large current output. In Figure 1, three optional connections to I_PEAK are shown. 1. Use the controller to treat I_PEAK as the logic input pin. This option is the easiest. 2. Use a D/A converter to force I(PEAK) to follow analog information, such as battery voltage. 3. Use an analog circuit to achieve the same results as the D/A converter. Figure 7. I_PEAK vs I(SW) The IGBT driver provided by the TPS65552A is a simple buffer in the logical table. Table 3 shows the function (see Figure 4). Table 3. IBGT Driver Function Table F_ON G_IGBT L L H H 9 Not Recommended for New designs |
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