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TS2581 Scheda tecnica(PDF) 5 Page - Taiwan Semiconductor Company, Ltd |
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TS2581 Scheda tecnica(HTML) 5 Page - Taiwan Semiconductor Company, Ltd |
5 / 7 page TS2581 PWM Controller 5/7 Version: A11 Application Information (Continue) Output Capacitor Selection The output capacitor is required to filter the output and provide regulator loop stability. The important capacitor parameters are; the 100 KHz Equivalent Series Resistance (ESR), the RMS ripples current rating, voltage rating, and capacitance value. For the output capacitor, the ESR value is the most important parameter. The ESR can be calculated from the following formula. ESR I V L RIPPLE × ∆ = = 0.6A x 80mΩ= 48mV An aluminum electrolytic capacitor’s ESR value is related to the capacitance and its voltage rating. In most case, higher voltage electrolytic capacitors have lower ESR values. Most of the time, capacitors with much higher voltage ratings may be needed to provide the low ESR values required for low output ripple voltage. System stability is depending on output capacitor’s ESR, Correct to choose output capacitor’s ESR is very important. It is recommended to using a 220~470µF, the ESR values range is 40~130mΩ. EN/CT The pin is enable/shutdown and auto restart control functions. When system is normal operating, this pin is enable/shutdown function. Pulling this pin below a threshold voltage of under 0.3V shuts the regulator off, and pulling this pin from 0.5V to 1.5V turns the regulator on. However when VOUT is short (VFB<0.4V), the auto restart function can be started that restart the regulator cycle by cycle. The cycle time is set by outside capacitor (C6). Please refer the below waveform and formula, the t2 cycle is regulator off time and t1 cycle is current limit time. The charge-current is 30uA and discharge-current is 1.3uA. VEN/CT Time t1 t2 Time Iin (A) 0.5V 1.5V 0 Current Limit Thermal Consideration The SOP-8L package needs a heat sink under most conditions. The heat sink connect exposed pad of TS2581 to obtain best effect. The size of the heat sink depends on the input voltage, the output voltage, the load current and the ambient temperature. |
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