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XC6221A401NR Datasheet(PDF) 8 Page - Torex Semiconductor |
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XC6221A401NR Datasheet(HTML) 8 Page - Torex Semiconductor |
8 / 23 page 8/23 XC6221 Series each circuit ON/OFF Control CE VIN VSS VOUT R1 R2 Error Amp - + CE CE/ Voltage Reference Current Limit CE/ Rdischg ● Except USPN-4 OUTPUT VOLTAGE (V) OUTPUT CAPACITOR VALUE 0.8V~1.15V CL ≧4.7μF 1.2V~1.35V CL ≧2.2μF 1.4V~4.0V CL ≧1.0μF 4.05V~5.0V CL ≧2.2μF ● USPN-4 OUTPUT VOLTAGE (V) OUTPUT CAPACITOR VALUE 1.2V~4.0V CL ≧2.2μF 4.05V~5.0V CL ≧4.7μF ■ OPERATIONAL EXPLANATION <Output Voltage Control> The voltage divided by resistors R1 & R2 is compared with the internal reference voltage by the error amplifier. The P-channel MOSFET 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. The current limit circuit and short protect circuit operate in relation to the level of output current. Further, the IC's internal circuitry can be shutdown via the CE pin's signal. <Input and Output Capacitors> The XC6221 needs an output capacitor CL for phase compensation. Values required for the phase compensation are shown in the chart below. If a loss of the capacitance happens, the stable phase compensation may not be obtained. Please ensure to use a capacitor which does not depend on bias or temperature too much. For a stable power input, please connect an input capacitor CIN of 1.0μF between the VIN pin and the VSS pin. <CL Auto-Discharge Function> XC6221B/D series can discharge the electric charge in the output capacitor (CL), when a low signal to the CE pin, which enables the whole IC circuit to be turned off, is inputted via the N-channel transistor located between the VOUT pin and the VSS pin (cf. BLOCK DIAGRAM). The CL auto-discharge resistance value is set at 780Ω(VOUT=4.0V @ VIN=6.0V at typical). The discharge time of the output capacitor (CL) is set by the CL auto-discharge resistance (R) and the output capacitor (CL). By setting the time constant of the CL auto-discharge resistance value [RDCHG] and the output capacitor value (CL) as τ(τ=C x RDCHG), the output voltage after discharge via the N-channel transistor is calculated by the following formula. V = VOUT(E) x e –t/τ, or t=τIn ( V / VOUT(E) ) where V : Output voltage after discharge VOUT (E) : Output voltage t : Discharge time τ : CL auto-discharge resistance RDCHG×Output capacitor (CL) value C) |
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