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TPS65560RGTRG4 Datasheet(PDF) 8 Page - Texas Instruments |
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TPS65560RGTRG4 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 13 page  www.ti.com t OFF TURN = N x L I PEAK V OUT (2) Programming Peak Current Voltage of I_PEAK - V IPEAK1 IPEAK2 TPS65560 SLVS608 – JANUARY 2006 The OFF time is dependant on output voltage. As the output voltage gets higher, the OFF time gets shorter (see Equation 2). The TPS65560 provides a method to program the peak primary current with a voltage applied to the I_PEAK pin. Figure 7 shows how to program I(PEAK). The I_PEAK input is treated as a logic input 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 a logic signal or by an analog input. Typical usages of this function are: 1. Setting the peak charging currents based on the battery voltage. Larger I(PEAK) for a fully charged battery and lower I(PEAK) for a discharged battery. 2. Reducing I(PEAK) when powering a zooming lens motor. This avoids inadvertent shutdowns due to large current from the battery. 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) 8 Submit Documentation Feedback |
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