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TPS65561RGTT Datasheet(PDF) 7 Page - Texas Instruments |
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TPS65561RGTT Datasheet(HTML) 7 Page - Texas Instruments |
7 / 16 page www.ti.com OFF ON OFF SW T LOGIC V V I I V (ZERO) V (SW) V (BAT) V A V OUT 0V 0V I (SW) I (PEAK) 0 A I OUT I (PEAK) (TURN) /N 0 A Time1 Time2 Time3 Time4 Time5 SW T V(FULL) CHG XFULL OFF ON OFF OFF ON OFF VBAT V(SW) V(SW) 0V VBAT VOUT VOUT VA VA 0V I (PEAK) I(PEAK)/N(TURN) I(SW) I(SW) IOUT IOUT 0 A 0 A V V I I Control Charging t ON =L I PEAK V BAT (1) TPS65561 SLVS691 – FEBRUARY 2007 Figure 5. Timing Diagram at One Switching Cycle Figure 6. Timing Diagram at Beginning/Ending The TPS65561 provides three comparators to control charging. Figure 2 shows the block diagram of TPS65561 and Figure 5 shows a timing diagram of one switch cycle. Note that emphasis is placed on Time1 and Time3 of the waveform in Figure 5. While SW is ON (Time1 to Time2 in Figure 5), U3 monitors current flow through the integrated power switch from SW pin to GND. When I(SW) exceeds I(PEAK), SW turns OFF (Time2 in Figure 5). When SW turns OFF (Time2 in Figure 5), the magnetic energy in the transformer starts discharging. Meanwhile, U2 monitors the kickback voltage at the SW terminal. As the energy is discharging, the kickback voltage is increasing according to the increase of VO (Time2 to Time3 in Figure 5). When almost all energy is discharged, the system cannot continue rectification via the diode, and the charging current of IO goes to zero (Times3 in Figure 5). After rectification stops, the small amount of energy left in the transformer is released via parasitic paths, and the kickback voltage reaches zero (Time3 to Time4 in Figure 5). During this period, U2 makes SW turn ON when (V(SW) - VBAT) dips from V(ZERO) (Time5 in Figure 5). In the actual circuit, the period between Time4 and Time5 in Figure 5 is small or does not appear dependent on the delay time of the U2 detection to SW ON. U1 also monitors the kickback voltage. When (V(SW) - VBAT) exceeds V(FULL), the TPS65561 stops charging (see Figure 6). In Figure 5 and Figure 6, ON time is always the same period in every switch cycle. The ON time is calculated by Equation 1. L and I(PEAK) are selected to ensure that tON does not exceed the MAX ON time (tMAX). 7 Submit Documentation Feedback |
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