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XC9510E1333 Datasheet(PDF) 11 Page - Torex Semiconductor |
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XC9510E1333 Datasheet(HTML) 11 Page - Torex Semiconductor |
11 / 36 page 11/36 XC9510 Series ■ OPERATIONAL EXPLANATION (Continued) ● Voltage Detector The detector block of the XC9510 series detects output voltage from the VDOUT pin while sensing either VDD, DCOUT, or VROUT internally. (N-channel Open Drain Type) < CE / MODE Pin Function> The operation of the XC9510 series' DC/DC converter block and voltage regulator block will enter into the shut down mode when a low level signal is input to the CE/MODE pin. During the shut down mode, the current consumption occurs only in the detector and is 3.0μA (TYP.), with a state of high impedance at the Lx pin and DCOUT pin. The IC starts its operation by inputting a high level signal or a middle level signal to the CE/MODE pin. The input to the CE/MODE pin is a CMOS input and the sink current is 0μA (TYP.). The operation of the XC9510D to F series' voltage detector block will enter into stand-by mode when a high level signal is input to the CE/MODE pin. The voltage regulator block will operate when a middle level signal is input. But when a low level signal is input, the voltage regulator block will enter into stand-by mode. With the XC9510H to L series control can be PWM control when the CE/MODE pin is 'M' level and PWM/PFM automatic switching control when the CE/MODE pin is 'H' level. ● Application Information 1. The XC9510 series is designed for use with ceramic output capacitors. If, however, the potential difference between dropout voltage or output current is too large, a ceramic capacitor may fail to absorb the resulting high switching energy and oscillation could occur on the output. If the input-output potential difference is large, connect an electrolytic capacitor in parallel to compensate for insufficient capacitance. 2. Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter. These are greatly influenced by external component selection, such as the coil inductance, capacitance values, and board layout of external components. Once the design has been completed, verification with actual components should be done. 3. When the difference between VIN and VOUT is large in PWM control, very narrow pulses will be outputted, and there is the possibility that some cycles may be skipped completely. 4. When the difference between VIN and VOUT is small, and the load current is heavy, very wide pulses will be outputted and there is the possibility that some cycles may be skipped completely: in this case, the Lx pin may not go low at all. ■ NOTES ON USE ● DC/DC Waveform (3.3V, 1.2MHz) < External Components> L:4.7μH(CDRH4D28C,SUMIDA) CIN:4.7μF(ceramic) CL:10μF(ceramic) < External Components> L:4.7μH(CDRH4D28C,SUMIDA) CIN:4.7μF(ceramic) CL:10μF(ceramic) |
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