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ELM652DA Datasheet(PDF) 5 Page - ELM Electronics |
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ELM652DA Datasheet(HTML) 5 Page - ELM Electronics |
5 / 8 page 5 Rev.1.1 8 - ■Application notes 1. CC current setting The constant current value of ELM652DA is set by R2 resistor and R3 resistor. The output current of CC mode and these resistors are set by the following equations: R2 = 0.112 / IC1 R3 = 0.112 / IC2 2. Input capacitor selection The bulk input capacitor selection is based on the voltage rating, the RMS current carrying capability, and the required input voltage ripple. The capacitor voltage rating is recommended with 1.5 times for the maximum input voltage as conservative guideline, depending on the application condition. The capacitor RMS current rating is considered for stress condition, and the trapezoid current waveform as the simplified formula is described: Irms = Iout(max) * √ ( Vout / Vin ) Vin = input voltage ; Vout = output voltage ; Iout(max) = maximum output current. The capacitor values with respect to the required input voltage ripple if neglect ESR is described: C = Iout(max) * ΔT / ΔV ΔT = capacitor supplied charging time ; ΔV = allowable input voltage ripple. 3. Output inductor selection The output inductor is selected for the trade-offs between the output inductor current ripple, dc resistance for power loss, load transient response time, and the physical size. The output inductor current ripple determines the output voltage ripple requirement, and the inductor’s dc re- sistance concerns the power loss. The larger the inductor value, the smaller the inductor ripple current, but the slower the transient response time, the larger the inductor dc resistance, and hence the larger the power loss. The inductance value is described: L = Vout * ( 1 - Vout / Vin ) * Tsw / ΔLl Vin = input voltage ; Vout = output voltage ; Tsw = switching period ; ΔLl = inductor ripple current. 4. Output capacitor selection The output capacitor is selected for the trade-offs between output ripple voltage requirement, the output voltage rating, the RMS current rating, the ESR and ESL for the load transient, and the physical size. The capacitor voltage rating is recommended with 1.5 times for the maximum output voltage as conservative guideline. The capacitor RMS current rating is considered for stress condition’ and the trapezoid current waveform as the simplified formula is described: Irms = ΔLl / 2√3 ; ΔLl = inductor ripple current. The output ripple voltage with respect to the capacitor ESR is described: ΔV = ΔI * ( ESR + Tsw / ( 8 * C ) ) ΔI = capacitor ripple current’ which is equivalent to the inductor ripple current ; ESR = capacitor equivalent series resistance ; Tsw = switching period. ELM652DA Dual-channeling CV/CC mode 36V switching controller |
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