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ST1S12XX データシート(PDF) 10 Page - STMicroelectronics |
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ST1S12XX データシート(HTML) 10 Page - STMicroelectronics |
10 / 20 page Application notes ST1S12XX, ST1S12XX12, ST1S12XX18 10/20 Doc ID 14314 Rev 3 6 Application notes The ST1S12Gxx is an adjustable current mode PWM step-down DC-DC converter with internal 0.7 A power switch, packaged in TSOT23-5L. This device is a complete 0.7 A switching regulator, with its internal compensation eliminating the need for additional components. Because the ST1S12Gxx an adjustable regulator, the output voltage is determined by an external resistor divider. The desired value is derived by the following equation: Equation 1 VO = VFB [1 + R1 / R2] For the device to function only a few component are required: an inductor, two capacitors and the resistor divider. The inductor selected must be capable of non saturation at peak current level. Moreover, its value can be selected taking into account that a large inductor value increases efficiency at low output current and reduces output voltage ripple, while a smaller inductor can be used when it is important to reduce package size and the total cost of the application. Finally, the ST1S12Gxx has been designed to work properly with X5R or X7R SMD ceramic capacitors both at the input and at the output. These types of capacitors, due to their very low series resistance (ESR), minimize the output voltage ripple. Other low ESR capacitors can be used according to the need of the application without compromising the correct functioning of the device. |
同様の部品番号 - ST1S12XX |
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同様の説明 - ST1S12XX |
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