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RT6296C Datasheet(PDF) 10 Page - Richtek Technology Corporation |
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RT6296C Datasheet(HTML) 10 Page - Richtek Technology Corporation |
10 / 13 page RT6296C Copyright © 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS6296C-00 May 2015 10 Application Information The RT6296C is a high voltage buck converter that can support the input voltage range from 4.5V to 17V and the input voltage range from 4.5V to 17V and the output current can be up to 2A. Output Voltage Selection The resistive voltage divider allows the FB pin to sense a fraction of the output voltage as shown in Figure 1. RT6296C GND FB R1 R2 VOUT R5 Figure 1. Output Voltage Setting For adjustable voltage mode, the output voltage is set by an external resistive voltage divider according to the following equation : OUT FB R1 V V 1 R2 Where VFB is the feedback reference voltage (0.807V typ.). Table 2 lists the recommended resistors value for common output voltages. Table 2. Recommended Resistors Value VOUT (V) R1 (k ) R2 (k ) R5 (k ) 1.0 20.5 84.5 140 3.3 40.2 13 24 5.0 40.2 7.68 24 External Bootstrap Diode Connect a 100nF low ESR ceramic capacitor between the BOOT pin and SW pin. This capacitor provides the gate driver voltage for the high side MOSFET. It is recommended to add an external bootstrap diode between an external 5V and BOOT pin, as shown as Figure 2, for efficiency improvement when input voltage is lower than 5.5V or duty ratio is higher than 65% .The bootstrap diode can be a low cost one such as IN4148 or BAT54. The external 5V can be a 5V fixed input from system or a 5V output (PVCC) of the RT6296C. SW BOOT 5V RT6296C 100nF Figure 2. External Bootstrap Diode External Soft-Start Capacitor RT6296C provides external soft-start function. The soft-start function is used to prevent large inrush current while converter is being powered-up. The soft-start timing can be programmed by the external capacitor (CSS) between SS pin and GND. The Chip provides a 11 A charge current (ISS) for the external capacitor. The soft-start time (tSS, VREF is from 0V to 0.8V) can be calculated by the following formula : SS SS SS C (nF) 1.3 t (ms) = I ( A) Inductor Selection The inductor value and operating frequency determine the ripple current according to a specific input and output voltage. The ripple current IL increases with higher VIN and decreases with higher inductance. OUT OUT L IN VV I1 f L V Having a lower ripple current reduces not only the ESR losses in the output capacitors but also the output voltage ripple. High frequency with small ripple current can achieve highest efficiency operation. However, it requires a large inductor to achieve this goal. For the ripple current selection, the value of IL = 0.3(IMAX) will be a reasonable starting point. The largest ripple current occurs at the highest VIN. To guarantee that the ripple current stays below the specified maximum, the inductor value should be chosen according to the following equation : OUT OUT L(MAX) IN(MAX) VV L1 f I V |
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