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XC6220D50BPR-G Datasheet(PDF) 9 Page - Torex Semiconductor |
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XC6220D50BPR-G Datasheet(HTML) 9 Page - Torex Semiconductor |
9 / 30 page 9/30 XC6220 Series RCE CE VIN VOUT VSS Error Amp - + Current Limit Thermal Protection Green Operation ON/OFF Control CE CE/ each circuit R1 R2 Voltage Reference CE/ The voltage divided by resistors R1 & R2 is compared with the internal reference voltage by the error amplifier. The P-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. The current limit circuit and short protect circuit operate in relation to the level of output current. The GO function monitors the output current and switches the IC between two operating modes according to the level of output current. Further, the IC's internal circuitry can be shutdown via the CE pin's signal. <Low ESR capacitor> The XC6220 series has a built-in phase compensation circuit which means that a stable output voltage is achieved even if the IC is used with low ESR capacitors. In order to ensure stable phase compensation it is recommended that a CL capacitor is connected as close as possible to the VOUT pin and VSS pin. For a stable power supply, please connect an input capacitor (CIN) between the VIN pin and the VSS pin. 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. Recommended output capacitor (CL) Values corresponding to input capacitor (CIN) INPUT CAPACITOR VALUE OUTPUT VOLTAGE (V) 4.7μF 10μF 22μF 0.80V~0.95V × × 22μF 1.00V~1.45V 47μF 47μF 22μF 1.50V~1.75V 47μF 22μF 10μF 1.80V~2.95V 47μF 6.8μF 6.8μF 3.00V~3.50V 47μF 4.7μF 4.7μF 3.55V~5.00V 47μF 10μF 6.8μF × No option <Current Limiter, Short-Circuit Protection> The XC6220 series includes a fold-back circuit, which aids the operation of the current limiter and circuit protection. When the load current reaches the current limit level, the fold-back circuit operates and output voltage drops. As a result of this drop in output voltage, output current also decreases. When the output pin is shorted, a current of about 180mA flows. <CE Pin> The IC's internal circuitry can be shutdown via the signal from the CE pin with the XC6220 series. With the XC6220B/D series, output at the VOUT pin will be pulled down to the VSS level. However, with XC6220A/B series, the CL auto-discharge resistor is connected in parallel to R1 and R2 while the power supply is applied to the VIN pin. Therefore, the time until the VOUT pin reaches the VSS level is shortened. The output voltage becomes unstable, when the CE pin is open. If this IC is used with the correct output voltage for the CE pin, the logic is fixed and the IC will operate normally. However, with the XC6220C/D series, supply current may increase as a result of through current in the IC's internal circuitry when medium voltage is input. ■ OPERATIONAL EXPLANATION <GreenOperation> The XC6220 series always operates in a green operation (GO) mode. The GO mode enables the IC to switch automatically between the high speed (HS) mode or the power save (PS) mode according to the level of output current. The switching point of the HS mode and the PS mode is fixed inside the IC. When the output current becomes IGOR=1.0mA (MIN.) or below, the mode changes automatically to the PS mode after a delay time of hundreds of microseconds. Supply current in light load is greatly reduced. Also when the output current becomes IGO 10mA (MAX.) or more, the mode changes automatically to the HS mode and the IC returns to high speed operation. XC6220x 301 0 10 20 30 40 50 0 5 10 15 20 Output Current: IOUT (mA) CE=V IN, Topr=25℃, CIN=10μF, CL=4.7μF (ceramic) |
Similar Part No. - XC6220D50BPR-G |
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Similar Description - XC6220D50BPR-G |
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