Datenblatt-Suchmaschine für elektronische Bauteile |
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L6911D Datenblatt(PDF) 3 Page - STMicroelectronics |
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L6911D Datenblatt(HTML) 3 Page - STMicroelectronics |
3 / 17 page 3/17 L6911D PIN FUNCTION Pin Num. Name Description 1 VSEN Connected to the output voltage is able to manage over-voltage conditions and the PGOOD signal. 2 OCSET A resistor connected from this pin and the upper Mos Drain sets the current limit protection. The internal 200 µA current generator sinks a current from the drain through the external resistor. The Over-Current threshold is due to the following equation: 3 SS/INH The soft start time is programmed connecting an external capacitor from this pin and GND. The internal current generator forces through the capacitor 10 µA. This pin can be used to disable the device forcing a voltage lower than 0.4V 4 - 8 VID0 - 4 Voltage Identification Code pins. These input are internally pulled-up and TTL compatible. They are used to program the output voltage as specified in Table 1 and to set the overvoltage and power good thresholds. Connect to GND to program a ‘0’ while leave floating to program a ‘1’. 9 COMP This pin is connected to the error amplifier output and is used to compensate the voltage control feedback loop. 10 FB This pin is connected to the error amplifier inverting input and is used to compensate the voltage control feedback loop. 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 thresholds. 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 (cathode 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 nominal supply voltage ranges from 5 to 12V. DO NOT CONNECT VIN TO A VOLTAGE GREATER THAN VCC. 19 OVP Over voltage protection. If the output voltage reaches the 17% 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 (typ). Forcing a 50 µA current into this pin, the built in oscillator stops to switch. I P I OC SE T R OCSET ⋅ R DS on ---------------------------------------------- = f S 200kHz 4.94 10 6 ⋅ R T k Ω () ------------------------- + = f S 200kHz 4.306 10 7 ⋅ R T k Ω () ----------------------------- – = |
Ähnliche Teilenummer - L6911D |
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Ähnliche Beschreibung - L6911D |
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