поискавой системы для электроныых деталей |
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ST1S10PUR датащи(PDF) 11 Page - STMicroelectronics |
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ST1S10PUR датащи(HTML) 11 Page - STMicroelectronics |
11 / 26 page ST1S10 Application information 11/26 where TON is the ON time of the internal switch, given by: TON = D/FS The inductor should be selected with saturation current (ISAT) equal to or higher than the inductor peak current, which can be calculated with the following equation: IPK = IO + (ΔISW/2), ISAT ≥ IPK The inductor peak current must be designed so that it does not exceed the switching current limit. 5.7 Inductor (0.8 V < VOUT < 2.5 V) For applications with lower output voltage levels (Vout < 2.5 V) the description in the previous section is still valid but it is recommended to keep the inductor values in a range from 1µH to 2.2 µH in order to improve the DC-DC control loop behavior, and increase the output capacitance depending on the VIN level as shown in the Figure 4 and Figure 5. In most application conditions a 2.2 µH inductor is the best compromise between DC-DC control loop behavior and output voltage ripple. 5.8 Function operation 5.8.1 Sync operation The ST1S10 operates at a fixed frequency or can be synchronized to an external frequency with the SYNC pin. The ST1S10 switches at a frequency of 900 kHz when the SYNC pin is connected to ground, and can synchronize the switching frequency between 400 kHz to 1.2 MHz from an external clock applied to the SYNC pin. When the SYNC feature is not used, this pin must be connected to ground with a path as short as possible to avoid any possible noise injected in the SYNC internal circuitry. 5.8.2 Inhibit function The inhibit pin can be used to turn OFF the regulator when pulled down, thus drastically reducing the current consumption down to less than 6 µA. When the inhibit feature is not used, this pin must be tied to VIN to keep the regulator output ON at all times. To ensure proper operation, the signal source used to drive the inhibit pin must be able to swing above and below the specified thresholds listed in the electrical characteristics section under VINH. Any slew rate can be used to drive the inhibit pin. 5.8.3 OCP (over-current protection) The ST1S10 DC-DC converter is equipped with a switch over-current protection. In order to provide protection for the application and the internal power switches and bonding wires, the device goes into a shutdown state if the switch current limit is reached and is kept in this condition for the TOFF period (TOFF(OCP) = 135 µs typ.) and turns on again for the TON period (TON(OCP) = 22 µs typ.) under typical application conditions. This operation is repeated cycle by cycle. Normal operation is resumed when no over-current is detected. |
Аналогичный номер детали - ST1S10PUR |
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Аналогичное описание - ST1S10PUR |
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