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L6911E Fiches technique(PDF) 6 Page - STMicroelectronics |
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L6911E Fiches technique(HTML) 6 Page - STMicroelectronics |
6 / 34 page Pin settings L6911E 6/34 11 GND All the internal references are referred to this pin. Connect it to the PCB signal ground. 12 PGOOD This pin is an open collector output and is pulled low if the output voltage is not within the above specified threshlds. If not used may be left floating. 13 PHASE This pin is connected to the source of the upper mosfet and provides the return path for the high side driver. This pin monitors the drop across the upper mosfet for the current limit. 14 UGATE High side gate driver output. 15 BOOT Bootstrap capacitor pin. Through this pin is supplied the high side driver and the upper mosfet. Connect through a capacitor to the PHASE pin and through a diode to Vcc (catode vs boot). 16 PGND Power ground pin. This pin has to be connected closely to the low side mosfet source in order to reduce the noise injection into the device 17 LGATE This pin is the lower mosfet gate driver output 18 VCC Device supply voltage. The operative supply voltage range is from 4.5 to 12V. DO NOT CONNECT VIN to 12V if VCC IS 5V. 19 OVP Over voltage protection. If the output voltage reach the 15% above the programmed voltage this pin is driven high and can be used to drive an external SCR that crowbar the supply voltage. If not used, it may be left floating. 20 RT Oscillator switching frequency pin. Connecting an external resistor from this pin to GND, the external frequency is increased according to the equation: Connecting a resistor from this pin to Vcc (12V), the switching frequency is reduced according to the equation: If the pin is not connected, the switching frequency is 200KHz. The voltage at this pin is fixed at 1.23V. Forcing a 50 µA current into this pin, the built in oscillator stops to switch. Table 2. Pin description (continued) N° Name Description f S 200kHz 510 6 ⋅ R T kΩ () -------------------- + = f S 200kHz 410 7 ⋅ R T kΩ () -------------------- – = |
Numéro de pièce similaire - L6911E |
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Description similaire - L6911E |
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