поискавой системы для электроныых деталей |
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L6591 датащи(PDF) 6 Page - STMicroelectronics |
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L6591 датащи(HTML) 6 Page - STMicroelectronics |
6 / 32 page Pin settings L6591 6/32 Pin N. Name Function 9Vcc Supply voltage of both the signal part of the IC and the low-side gate driver. The internal high voltage generator charges an electrolytic capacitor connected between this pin and GND (#11) as long as the voltage on the pin is below the start-up threshold of the IC, after that it is disabled and the chip turns on. Sometimes a small bypass capacitor (0.1 µF typ.) to GND might be useful to get a clean bias voltage for the signal part of the IC. The minimum operating voltage (UVLO) is adapted to the loading conditions of the converter to ease burst-mode operation, during which the available supply voltage for the IC drops. 10 LVG Low-side gate-drive output. The driver is capable of 0.3 A min. source and 0.8A min. sink peak current to drive the gate of the lower MOSFET of the half-bridge leg. The pin is actively pulled to GND (#11) during UVLO. 11 GND Chip ground. Current return for both the low-side gate-drive current and the bias current of the IC. All of the ground connections of the bias components should be tied to a track going to this pin and kept separate from any pulsed current return. 12 N.C. High-voltage spacer. The pin is not connected internally to isolate the group of high-voltage pins and comply with safety regulations (creepage distance) on the PCB. 13 FGND High-side gate-drive floating ground. Current return for the high-side gate- drive current. Layout carefully the connection of this pin to avoid too large spikes below ground. 14 HVG High-side floating gate-drive output. The driver is capable of 0.3 A min. source and 0.8 A min. sink peak current to drive the gate of the upper MOSFET of the half-bridge leg. A pull-down resistor between this pin and pin 13 (FGND) makes sure that the gate is never floating during UVLO. 15 BOOT High-side gate-drive floating supply voltage. The bootstrap capacitor connected between this pin and pin 13 (FGND) is fed by an internal synchronous bootstrap diode driven in-phase with the low-side gate-drive. This patented structure can replace the normally used external diode. 16 HVSTART High-voltage start-up. The pin is to be connected directly to the rectified mains voltage. A 0.8 mA internal current source charges the capacitor connected between pin Vcc (#9) and GND (#11) until the voltage on the Vcc pin reaches the start-up threshold. Normally it is re-enabled when the voltage on the Vcc pin falls below 5 V, except under latched shutdown conditions, in which case it is re-enabled as the Vcc voltage falls 1 V below the start-up threshold to keep the latch active. Table 1. Pin functions (continued) |
Аналогичный номер детали - L6591 |
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Аналогичное описание - L6591 |
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