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L6730 Datasheet(PDF) 9 Page - STMicroelectronics |
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L6730 Datasheet(HTML) 9 Page - STMicroelectronics |
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9 / 52 page  L6730 - L6730B Pin connections and functions 9/52 11 OCL 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 (IOCL) from this pin to ground through the external resistor (ROCL). The over-current threshold is given by the following equation: Connecting a capacitor from this pin to GND helps in reducing the noise injected from VCC to the device, but can be a low impedance path for the high- frequency noise related to the GND. Connect a capacitor only to a “clean” GND. 12 OCH 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: 13 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. 14 HGATE This pin is connected to the high-side MOSFET(s) gate. 15 BOOT The high-side driver is supplied through this pin. Connect a capacitor from this pin to the PHASE pin, and a diode from VCCDR to this pin (cathode versus BOOT). 16 PGND This pin has to be connected closely to the low-side MOSFET(s) source in order to reduce the noise injection into the device. 17 LGATE This pin is connected to the low-side MOSFET(s) gate. 18 VCCDR 5V internally regulated voltage. It is used to supply the internal drivers and as a voltage reference. Filter it to GND with at least a 1µF ceramic cap. 19 VCC Supply voltage pin. The operative supply voltage range is from 4.5V to 14V. 20 PGOOD This pin is an open collector output and it is pulled low if the output voltage is not within the specified thresholds (90%-110%). If not used it may be left floating. Pull up this pin to VCCDR with a 10K resistor to obtain a logical signal. Table 3. Pins connection DSonLS R 2 OCL R OCL I VALLEY I ⋅ ⋅ = DSonHS R OCH R OCH I PEAK I ⋅ = |
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