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C3225X5R1E106K Datasheet(PDF) 10 Page - Richtek Technology Corporation |
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C3225X5R1E106K Datasheet(HTML) 10 Page - Richtek Technology Corporation |
10 / 15 page RT8296B 10 DS8296B-03 March 2011 www.richtek.com To prevent enabling circuit when VIN is smaller than the VOUT target value, a resistive voltage divider can be placed between the input voltage and ground and connected to the EN pin to adjust IC lockout threshold, as shown in Figure 4. For example, if an 8V output voltage is regulated from a 12V input voltage, the resistor, REN2, can be selected to set input lockout threshold larger than 8V. VIN EN GND BOOT FB SW 7 5 2 3 1 L R1 R2 VOUT VIN RT8296B SS 8 CSS COMP CC RC CP 6 4, 9 (Exposed Pad) CBOOT COUT CIN REN1 100k 8V 10 µF REN2 12V Figure 4. The Resistors can be Selected to Set IC Lockout Threshold 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. OUT OUT L(MAX) IN(MAX) VV L =1 f IV ×− ×∆ The inductor's current rating (caused a 40 °C temperature rising from 25 °C ambient) should be greater than the maximum load current and its saturation current should be greater than the short circuit peak current limit. Please see Table 2 for the inductor selection reference. Table 2. Suggested Inductors for Typical Application Circuit Component Supplier Series Dimensions (mm) TDK VLF10045 10 x 9.7 x 4.5 TDK SLF12565 12.5 x 12.5 x 6.5 TAIYO YUDEN NR8040 8 x 8 x 4 CIN and COUT Selection The input capacitance, CIN, is needed to filter the trapezoidal current at the source of the high side MOSFET. To prevent large ripple current, a low ESR input capacitor sized for the maximum RMS current should be used. The RMS current is given by : Hiccup Mode For the RT8296BH, it provides Hiccup Mode Under Voltage Protection (UVP) is provided. When the FB voltage drops belowhalf of thefeedbackreferencevoltage,VFB, the UVP function will be triggered and the RT8296BH will shut down for a period of time and then recover automatically. The Hiccup Mode UVP can reduce input current in short-circuit conditions. Latch-Off Mode For the RT8296BL, it provides Latch-Off Mode Under Voltage Protection (UVP) is provided. When the FB voltage drops below half of the feedback reference voltage, VFB, the UVP will be triggered and the RT8296BL will shut down in Latch-Off Mode. In shutdown condition, the RT8296BL can be reset via the EN pin or power input VIN. 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 I =1 f LV ∆ ×− × For the ripple current selection, the value of ∆IL= 0.24(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 : |
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