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TS3406 bảng dữ liệu(PDF) 4 Page - Taiwan Semiconductor Company, Ltd |
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TS3406 bảng dữ liệu(HTML) 4 Page - Taiwan Semiconductor Company, Ltd |
4 / 7 page TS3406 600mA / 1.5MHz Synchronous Buck Converter 4/7 Version: B07 Function Description (Continue) Maximum Load Current The TS3406 will operate with input supply voltage as low as 2.5V, however, the maximum load current decreases at lower input due to large IR drop on the main switch and synchronous rectifier. The slope compensation signal reduces the peak inductor current as a function of the duty cycle to prevent sub-harmonic oscillations at duty cycles greater than 50%. Conversely the current limit increases as the duty cycle decreases. Application Information Setting the Output Voltage Application circuit item shows the basic application circuit with TS3406 adjustable output version. The external resistor sets the output voltage according to the following equation: Inductor Selection For most designs, the TS3406 operates with inductors of 1µH to 4.7µH. Low inductance values are physically smaller but require faster switching, which results in some efficiency loss. The inductor value can be derived from the following equation: Where is inductor Ripple Current. Large value inductors lower ripple current and small value inductors result in high ripple currents. Choose inductor ripple current approximately 35% of the maximum load current 600mA, ∆IL=210mA. For output voltages above 2.0V, when light-load efficiency is important, the minimum recommended inductor is 2.2µH. For optimum voltage-positioning load transients, choose an inductor with DC series resistance in the 50mΩ to 150mΩ range. For higher efficiency at heavy loads (above 200mA), or minimal load regulation (but some transient overshoot), the resistance should be kept below 100mΩ. The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation (600mA+105mA). Input Capacitor Selection The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input capacitor impedance at the switching frequency shall be less than input source impedance to prevent high frequency switching current passing to the input. A low ESR input capacitor sized for maximum RMS current must be used. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and small temperature coefficients. A 4.7µF ceramic capacitor for most applications is sufficient. Table 1: Resistor Select for Output Voltage Setting VOUT R2 R1 1.2V 300K 300K 1.5V 300K 450K 1.8V 300K 600K 2.5V 300K 950K Table 2: Inductor Select for Output Voltage Setting (Vcc-3.6V) VOUT 1.2V 1.5V 1.8V 2.5V Inductor 2.2uH 2.2uH 2.2uH 2.2uH Part Number WE-TPC 7440430027 7440430027 7440430027 7440430022 Note: Part Type MH or M (www.we-online.com) |
Số phần tương tự - TS3406_08 |
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Mô tả tương tự - TS3406_08 |
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