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C3225X5R0J476M Datasheet(PDF) 10 Page - Richtek Technology Corporation |
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C3225X5R0J476M Datasheet(HTML) 10 Page - Richtek Technology Corporation |
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10 / 14 page  RT8288 10 DS8288-03 June 2012 www.richtek.com © Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Figure 3. Enable Control Circuit for Logic Control with Low Voltage Figure 4. The Resistors can be Selected to Set IC Lockout Threshold Under Output Voltage Protection-Hiccup Mode For the IC, Hiccup Mode of Under Voltage Protection (UVP) is provided. When the FB voltage drops below half of the feedback reference voltage, VFB, the UVP function will be triggered and the IC will shut down for a period of time and then recover automatically. The Hiccup Mode of UVP can reduce input current in short-circuit conditions. Inductor Selection For a given input and output voltage, the inductor value and operating frequency determine the ripple current. The ripple current ΔIL increases with higher VIN and decreases with higher inductance. OUT OUT L IN VV I = 1 fL V ⎡⎤ ⎡ ⎤ Δ× − ⎢⎥ ⎢ ⎥ × ⎣⎦ ⎣ ⎦ Having a lower ripple current reduces not only the ESR losses in the output capacitors but also the output voltage ripple. Highest efficiency operation is achieved by reducing ripple current at low frequency, but it requires a large inductor to attain this goal. For the ripple current selection, the value of ΔIL = 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 a specified maximum, the inductor value should be chosen according to the following equation : OUT OUT L(MAX) IN(MAX) VV L = 1 fI V ⎡⎤ ⎡ ⎤ ×− ⎢⎥ ⎢ ⎥ ×Δ ⎣⎦ ⎣ ⎦ 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 and it is highly recommended to keep inductor value as close as possible to the recommended inductor values for each VOUT as shown in Table 1. 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 Table 2. Suggested Inductors for Typical Application Circuit VIN VCC BOOT FB SW 6 1 2, 3 4 L R1 R2 VOUT VIN RT8288 7 CBOOT COUT CIN RT GND 8, 9 (Exposed Pad) EN CC 5 Q1 REN 100k Chip Enable VIN VCC BOOT FB SW 6 1 2, 3 4 L R1 R2 VOUT VIN RT8288 7 CBOOT COUT CIN RT GND 8, 9 (Exposed Pad) EN CC 5 REN 100k REN2 |
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