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XC6601A17BML Datasheet(PDF) 11 Page - Torex Semiconductor |
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XC6601A17BML Datasheet(HTML) 11 Page - Torex Semiconductor |
11 / 32 page 11/32 XC6601 Series <Voltage Regulator> The voltage divided by resistors R1 & R2 is compared with the internal reference voltage by the error amplifier. The N-channel MOSFET which is connected to the VOUT pin is then driven by the subsequent output signal. The output voltage at the VOUT pin is controlled & stabilized by a system of negative feedback. VBIAS pin is power supply pin for output voltage control circuit, protection circuit and CE circuit. When output current increase, the VBIAS pin supplies output current also. VIN pin is connected to a driver transistor and provides output current. In order to obtain high efficient output current through low on-resistance, please take enough Vgs (=VBIAS – VOUT(T)) of the driver transistor. Output current triggers operation of constant current limiter and fold-back circuit, heat generation triggers operation of thermal shutdown circuit, the driver transistor circuit is forced OFF when VBIAS or VIN voltage goes lower than UVLO voltage. Further, the IC's internal circuitry can be shutdown via the CE pin's signal. XC6601A series < Low ESR Capacitor> With the XC6601 series, a stable output voltage is achievable even if used with low ESR capacitors, as a phase compensation circuit is built-in. The output capacitor (CL) should be connected as close to VOUT pin and VSS pin to obtain stable phase compensation. Values required for the phase compensation are as the table below. For a stable power input, please connect an bias capacitor (CBIAS ) of 1.0μF between the V BIAS pin and the VSS pin. Also, please connect an input capacitor (CIN) of 1.0μF between the VIN pin and the VSS pin. In order to ensure the stable phase compensation while avoiding run-out of values, please use the capacitor (CBIAS, CIN, CL ) which does not depend on bias or temperature too much. The table below shows recommended values of CBIAS, CIN, CL. Recommended Values of CBIAS, CIN, CL BIAS CAPACITOR INPUT CAPACITOR OUTPUT CAPACITOR SETTING VOLTAGE CBIAS CIN CL 0.7V~1.8V CBIAS=1.0μF CIN=1.0μF CL=4.7μF ■OPERATIONAL EXPLANATION |
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