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ST1S10 датащи(PDF) 8 Page - STMicroelectronics |
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ST1S10 датащи(HTML) 8 Page - STMicroelectronics |
8 / 26 page Application information ST1S10 8/26 5 Application information 5.1 Description The ST1S10 is a high efficiency synchronous step-down DC-DC converter with inhibit function. It provides up to 3 A over an input voltage range of 2.5 V to 18 V, and the output voltage can be adjusted from 0.8 V up to 85% of the input voltage level. The synchronous rectification removes the need for an external Schottky diode and allows higher efficiency even at very low output voltages. A high internal switching frequency (0.9 MHz) allows the use of tiny surface-mount components, as well as a resistor divider to set the output voltage value. In typical application conditions, only an inductor and 3 capacitors are required for proper operation. The device can operate in PWM mode with a fixed frequency or synchronized to an external frequency through the SYNC pin. The current mode PWM architecture and stable operation with low ESR SMD ceramic capacitors results in low, predictable output ripple. No external compensation is needed. To maximize power conversion efficiency, the ST1S10 works in pulse skipping mode at light load conditions and automatically switches to PWM mode when the output current increases. The ST1S10 is equipped with thermal shut down protection activated at 150°C (typ.). Cycle-by-cycle short circuit protection provides protection against shorted outputs for the application and the regulator. An internal soft start for start-up current limiting and power ON delay of 275 µs (typ.) helps to reduce inrush current during start-up. 5.2 External components selection 5.2.1 Input capacitor The ST1S10 features two VIN pins: VIN_SW for the power supply input voltage where the switching peak current is drawn, and VIN_A to supply the ST1S10 internal circuitry and drivers. The VIN_SW input capacitor reduces the current peaks drawn from the input power supply and reduces switching noise in the IC. A high power supply source impedance requires larger input capacitance. For the VIN_SW input capacitor the RMS current rating is a critical parameter that must be higher than the RMS input current. The maximum RMS input current can be calculated using the following equation: where η is the expected system efficiency, D is the duty cycle and IO is the output DC current. The duty cycle can be derived using the equation: D = (VOUT + VF) / (VIN-VSW) where VF is the voltage drop across the internal NMOS, and VSW represents the voltage drop across the internal PDMOS. The minimum duty cycle (at VIN_max) and the maximum η D η D 2 - D I I 2 2 O RMS + ⋅ ⋅ = η D η D 2 - D I I 2 2 O RMS + ⋅ ⋅ = |
Аналогичный номер детали - ST1S10 |
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Аналогичное описание - ST1S10 |
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