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GS-R24F データシート(PDF) 6 Page - STMicroelectronics |
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GS-R24F データシート(HTML) 6 Page - STMicroelectronics |
6 / 13 page Application information GS-R24F 6/13 4 Application information 4.1 Input voltage The recommended maximum operating Dc input voltage is 35 V including ripple voltage. 4.2 Reference voltage No capacitor is required for stability. 4.3 Inhibit function The inhibit feature allows to put the device in stand-by mode. With INH pin 1 is higher than 2.2 V the device is disabled and the current consumption is reduced to less than 150 µA for VI = 35 V. With INH pin lower than 0.8 V, the device is enabled. If the INH pin is left floating, an internal pull up ensures that the voltage at the pin reaches the inhibit threshold and the device is disabled. The pin can be pulled to VI to disable the device. 4.4 Multiple units synchronization Using more than one unit on the same circuit, it is possible to synchronize the switching frequency, connecting all pin 12 together (see Figure 5). The unit with higher frequency becomes the master. 4.5 Current limitation The device has two current limit protections, pulse by pulse and frequency fold back. The current is sensed through a resistor and if it reaches the threshold, the on time is reduced and consequently the output voltage, too. Since the minimum switch ON time (necessary to avoid false overcurrent signal) is not enough to obtain a sufficiently low duty cycle at 250 Hz, the output current could increase again, in strong overcurrent or short circuit conditions. For this reason the switching frequency is also reduced to keep the inductor current within its maximum threshold limit. The frequency depends on the feedback voltage. As the feedback voltage decreases (due to the reduced duty cycle), the switching frequency decrease too. |
同様の部品番号 - GS-R24F_08 |
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同様の説明 - GS-R24F_08 |
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