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6TPC150M 数据表(PDF) 16 Page - International Rectifier |
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6TPC150M 数据表(HTML) 16 Page - International Rectifier |
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16 / 22 page ![]() March 27, 2013 | V2.2 | PD97601 16 IR3473 6A Highly Integrated SupIRBuck TM DESIGN EXAMPLE DESIGN CRITERIA • Input Voltage, VIN = 6V to 21V • Output Voltage, VOUT = 1.25V • Switching Frequency, Fs = 400kHz • Inductor Ripple Current, 2ΔI = 2A • Maximum Output Current, IOUT = 6A • Over Current Trip, IOC = 9A • Current Transient Step Size = 3A • Overshoot Allowance, VOS = VOUT + 50mV • Undershoot Allowance, VDROP = 50mV Find RFF: Pick a standard value 158 kΩ, 1% resistor. Find RSET: Pick a 11.5kΩ, 1% standard resistor. Find a resistive voltage divider for VOUT = 1.25V: R2 = 1.33kΩ, R1 = 1.96 kΩ, both 1% standard resistors. Choose the soft start capacitor: Once the soft start time has chosen, such as 1000µs to reach to the reference voltage, a 22nF for CSS is used to meet 1000µs. Choose an inductor to meet the design specification: Choose the inductor with the lowest DCR and AC power loss as possible to increase the overall system efficiency. For instance, choose a PCMB065T‐1R5MS manufactured by CYNTEC. The inductance of this part is 1.5µH and has 6.7mΩ DCR. Ripple current needs to be recalculated using the chosen inductor. Choose an input capacitor: A Panasonic 10µF (ECJ3YB1E106M) accommodates 6 Arms of ripple current at 300kHz. Due to the chemistry of multilayer ceramic capacitors, the capacitance varies over temperature and operating voltage, both AC and DC. One 10µF capacitor is recommended. In a practical solution, one 1µF capacitor is required along with 10µF. The purpose of the 1µF capacitor is to suppress the switching noise and deliver high frequency current. Choose an output capacitor: To meet the undershoot and overshoot specification, equations 7b and 8 will be used to calculate the minimum output capacitance. As a result, 110μF will be needed for 3A load removal. To meet the stability requirement, choose an output capacitor with ESR larger than 9mΩ. Combine those two requirements, one can choose a set of output capacitors from manufactures such as SP‐Cap (Specialty Polymer Capacitor) from Panasonic or POSCAP from Sanyo. A 150μF (4TPE150MI) from Sanyo with 18mΩ ESR will meet both requirements. If an all ceramic output capacitor solution is desired, the external slope injection circuit composed of R6, C13, and C14 is required as explained in the Stability Considerations section. In this design example, we can choose C14 = 1nF and C13 = 100nF. To calculate the value of R6 with PCMB065T‐ 1R5MS as our inductor: Pick a standard value for R6 = 2.26kΩ. k 156 400k 20 1 1.25 RFF Ω = ⋅ ⋅ = Hz pF V V Ω = Ω = ⋅ k 4 . 1 1 9 1 9 24m RSET A A μ V 0.5 V R R R V OUT 1 2 2 FB = ⋅ + = () () H Hz A V V V V μ 1.5 400k 2 21 1.25 - 21 1.25 F ΔI 2 V V V V L s IN OUT IN OUT = ⋅ ⋅ ⋅ = ⋅ ⋅ = ⋅ − ( ) A Hz H V V V V I 2 400k 1.5 21 1.25 - 21 1.25 2Δ = ⋅ ⋅ ⋅ = μ A A A V V A 5 . 1 6 1 3 1 1 21 1.25 6 I 2 IN_RMS = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ ⋅ + ⋅ ⋅ = Ω = ⋅ Ω = ⋅ = k nF m H C DCR L 24 . 2 100 7 . 6 5 . 1 R 13 6 μ |
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