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XC9511D14SRL Datasheet(PDF) 10 Page - Torex Semiconductor |
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XC9511D14SRL Datasheet(HTML) 10 Page - Torex Semiconductor |
10 / 13 page Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector Preliminary ! OPERATIONAL EXPLANATION (Continued) < U.V.L.O. Circuit> # High Speed LDO Voltage Regulator < Reference Voltage Source > The reference voltage source provides the reference voltage to ensure stable output voltage of the regulator. < Error Amplifier > The error amplifier compares the reference voltage with the signal from VROUT, and the amplifier controls the output of the Pch driver transistor. <Current Limit Circuit> # Voltage Detector The detector block of the XC9511 series detects output voltage from the VDOUT pin while sensing either VDD, DCOUT, or VROUT internally. (N channel Open Drain Type) XC9511 Series When the VIN pin voltage becomes 1.4 V or lower, the P-channel output driver transistor is forced OFF to prevent false pulse output caused by unstable operation of the internal circuitry. When the VIN pin voltage becomes 1.8 V or higher, switching operation takes place. By releasing the U.V.L.O. function, the IC performs the soft start function to initiate output startup operation. The soft start function operates even when the VIN pin voltage falls momentarily below the U.V.L.O. operating voltage. The U.V.L.O. circuit does not cause a complete shutdown of the IC, but causes pulse output to be suspended; therefore, the internal circuitry remains in operation. The voltage regulator block includes a combination of a constant current limiter circuit and a foldback circuit. The voltage regulator senses output current of the built-in P channel output driver transistor inside. When the load current reaches the current limit level, the current limiter circuit operates and the output voltage of the voltage regulator block drops. As a result of this drop in output voltage, the foldback circuit operates, output voltage drops further and the load current decreases. When the VROUT and GND pin are shorted, the load current of about 30mA flows. The voltage regulator block of the XC9511 series consists of a reference voltage source, error amplifier, and current limiter circuit. The voltage divided by split resistors is compared with the internal reference voltage by the error amplifier. The P-Channel MOSFET, which is connected to the VROUT pin, is then driven by the subsequent output signal. The output voltage at the VROUT pin is controlled and stabilized by a system of negative feedback. A stable output voltage is achievable even if used with low ESR capacitors as a phase compensation circuit is built-in. Semiconductor Ltd. Data Sheet 10 |
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