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L6725TR Datasheet(PDF) 7 Page - STMicroelectronics |
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L6725TR Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 27 page L6725 Pin connections and functions 7/27 4OCL A resistor connected from this pin to ground sets the valley- current-limit. The valley current is sensed through the low-side MOSFET(s). The internal current generator sources a current of 100 µA (I OCL) from this pin to ground through the external resistor (ROCL). The over-current threshold is given by the following equation: 5OCH A resistor connected from this pin and the high-side MOSFET(s) drain sets the peak- current-limit. The peak current is sensed through the high-side MOSFET(s). The internal 100 µA current generator (IOCH) sinks a current from the drain through the external resistor (ROCH). The over-current threshold is given by the following equation: 6 PHASE This pin is connected to the source of the high-side MOSFET(s) and provides the return path for the high-side driver. This pin monitors the drop across both the upper and lower MOSFET(s) for the current limit together with OCH and OCL. 7 HGATE This pin is connected to the high-side MOSFET(s) gate. 8BOOT Through this pin is supplied the high-side driver. Connect a capacitor from this pin to the PHASE pin and a diode from VCCDR to this pin (cathode versus BOOT). 9PGND This pin has to be connected closely to the low-side MOSFET(s) source in order to reduce the noise injection into the device. 10 LGATE This pin is connected to the low-side MOSFET(s) gate. 11 VCCDR 5V internally regulated voltage. It is used to supply the internal drivers. Filter it to ground with a 1uF ceramic cap. 12 VCC Supply voltage pin. The operative supply voltage range is from 4.5V to 14V. Table 3. Pin functions DSonLS R 2 OCL R OCL I VALLEY I ⋅ ⋅ = DSonHS R OCH R OCH I PEAK I ⋅ = |
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