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NCP6334CMTAATBG Datasheet(PDF) 11 Page - ON Semiconductor |
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NCP6334CMTAATBG Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 14 page NCP6334B, NCP6334C http://onsemi.com 11 APPLICATION INFORMATION Output Filter Design Considerations The output filter introduces a double pole in the system at a frequency of fLC + 1 2 @ p @ L @ C (eq. 2) The internal compensation network design of the NCP6334B/C is optimized for the typical output filter comprised of a 1.0 mH inductor and a 10 mF ceramic output capacitor, which has a double pole frequency at about 50 kHz. Other possible output filter combinations may have a double pole around 50 kHz to have optimum operation with the typical feedback network. Normal selection range of the inductor is from 0.47 mH to 4.7 mH, and normal selection range of the output capacitor is from 4.7 mF to 47 mF. Inductor Selection The inductance of the inductor is determined by given peak−to−peak ripple current IL_PP of approximately 20% to 50% of the maximum output current IOUT_MAX for a trade−off between transient response and output ripple. The inductance corresponding to the given current ripple is L + VIN * VOUT @ VOUT VIN @ fSW @ IL_PP (eq. 3) The selected inductor must have high enough saturation current rating to be higher than the maximum peak current that is IL_MAX + IOUT_MAX ) IL_PP 2 (eq. 4) The inductor also needs to have high enough current rating based on temperature rise concern. Low DCR is good for efficiency improvement and temperature rise reduction. Table 1 shows some recommended inductors for high power applications and Table 2 shows some recommended inductors for low power applications. Table 1. LIST OF RECOMMENDED INDUCTORS FOR HIGH POWER APPLICATIONS Manufacturer Part Number Case Size (mm) L (mH) Rated Current (mA) (Inductance Drop) Structure MURATA LQH44PN2R2MP0 4.0 x 4.0 x 1.8 2.2 2500 (−30%) Wire Wound MURATA LQH44PN1R0NP0 4.0 x 4.0 x 1.8 1.0 2950 (−30%) Wire Wound MURATA LQH32PNR47NNP0 3.0 x 2.5 x 1.7 0.47 3400 (−30%) Wire Wound Table 2. LIST OF RECOMMENDED INDUCTORS FOR LOW POWER APPLICATIONS Manufacturer Part Number Case Size (mm) L (mH) Rated Current (mA) (Inductance Drop) Structure MURATA LQH44PN2R2MJ0 4.0 x 4.0 x 1.1 2.2 1320 (−30%) Wire Wound MURATA LQH44PN1R0NJ0 4.0 x 4.0 x 1.1 1.0 2000 (−30%) Wire Wound TDK VLS201612ET−2R2 2.0 x 1.6 x 1.2 2.2 1150 (−30%) Wire Wound TDK VLS201612ET−1R0 2.0 x 1.6 x 1.2 1.0 1650 (−30%) Wire Wound Output Capacitor Selection The output capacitor selection is determined by output voltage ripple and load transient response requirement. For a given peak−to−peak ripple current IL_PP in the inductor of the output filter, the output voltage ripple across the output capacitor is the sum of three ripple components as below. VOUT_PP [ VOUT_PP(C) ) VOUT_PP(ESR) ) VOUT_PP(ESL) (eq. 5) where VOUT_PP(C) is a ripple component by an equivalent total capacitance of the output capacitors, VOUT_PP(ESR) is a ripple component by an equivalent ESR of the output capacitors, and VOUT_PP(ESL) is a ripple component by an equivalent ESL of the output capacitors. In PWM operation mode, the three ripple components can be obtained by VOUT_PP(C) + IL_PP 8 @ C @ fSW (eq. 6) VOUT_PP(ESR) + IL_PP @ ESR (eq. 7) VOUT_PP(ESL) + ESL ESL ) L @ VIN (eq. 8) and the peak−to−peak ripple current is IL_PP + VIN * VOUT @ VOUT VIN @ fSW @ L (eq. 9) |
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