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XC92071L6MR Datasheet(PDF) 11 Page - Torex Semiconductor |
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XC92071L6MR Datasheet(HTML) 11 Page - Torex Semiconductor |
11 / 15 page XC9206 / 9207/ 9208 Series PWM, PWM/PFM Switchable Step-Down DC/DC Converters with Driver Transistor Built-In " OPERATIONAL EXPLANATION (Continued) < U.V.L.O. Circuit> < Function of CE/MODE pin > # XC9206A / 07A series - Examples of how to use CE/MODE pin (A) (B) (A) (B) # XC9208A series - Examples of how to use CE/MODE pin (A) (B) (A) (B) Intermediate voltage can be generated by RM1 and RM2. Please set the value of each R1, R2, RM1, RM2 at around 100k Ω. For switches, CPU open-drain I/O port and transistor can be used. < PWM / PFM > 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 XC9206/9207/9208 series will enter into shut down state by inputting a low level signal to the CE/MODE pin. During a shut down state, the current consumption of the IC becomes 0 µA (TYP.), with a state of high impedance at the Lx pin and VOUT pin. The IC starts its operation by inputting a high level signal to the CE/MODE pin. The input of the CE/MODE pin is a CMOS input and the sink current is 0 µA (TYP.). Chip Disable PWM control (XC9206), PWM/PFM automatic switching control (XC9207) SW_CE ON OFF STATUS SW_CE STATUS ON PWM control (XC9206), PWM/PFM automatic switching control (XC9207) * ON Synchronous PWM control OFF Chip Disable SW_CE ON STATUS OFF OFF Synchronous PWM control Chip Disable ON * OFF ON Non-synchronous PWM/PFM automatic switching control SW_CE SW_PMW/PFM STATUS OFF OFF Non-synchronous PWM/PFM automatic switching control Chip Disable OFF SW_PMW/PFM XC9207/9208 series features PWM/PFM automatic switching control. With the automatic PWM/PFM switching control function, the series ICs are automatically switched from PWM control to PFM control mode under light load conditions. If during light load conditions the coil current becomes discontinuous and on-time rate falls lower than PFM duty, the PFM circuit operates to output a pulse with a fixed on-time rate from the Lx pin. During PFM operation with this fixed on-time rate, pulses are generated at different frequencies according to conditions of the moment. This causes a reduction in the number of switching operations per unit of time, resulting in efficiency improvement under light load conditions. However, since pulse output frequency is not constant, consideration should be given if a noise filter or the like is needed. Necessary conditions for switching to PFM operation depend on input voltage, load current, coil value and other factors. Semiconductor Ltd. CE/ MODE VIN VDD R1 SW_CE CE/ MODE VIN VDD R2 SW_CE CE/MODE VIN VDD RM1 SW _ PW M/ PFM RM2 SW_CE CE/ MODE VIN VDD RM1 SW_ PWM/PFM RM2 SW_CE Data Sheet 11 |
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