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L6732 データシート(PDF) 8 Page - STMicroelectronics |
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L6732 データシート(HTML) 8 Page - STMicroelectronics |
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8 / 36 page  Pin connections and functions L6732 8/36 Pin n. Name Function 7 EAREF By setting the voltage at this pin is possible to select the internal/external reference and the switching frequency: VEAREF 0-80% of VCCDR -> External Reference/FSW=250KHz VEAREF = 80%-95% of VCCDR -> VREF = 0.6V/FSW=500KHz VEAREF = 95%-100% of VCCDR -> VREF = 0.6V/FSW=250KHz An internal clamp limits the maximum VEAREF at 2.5V (typ.). The device captures the analog value present at this pin at the start-up when VCC meets the UVLO threshold. 8 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 100µA (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. 9 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 100µA current generator (IOCH) sinks a current from the drain through the external resistor (ROCH). The over-current threshold is given by the following equation: 10 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. 11 HGATE This pin is connected to the high-side MOSFET(s) gate. 12 BOOT 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). 13 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. 14 LGATE This pin is connected to the low-side MOSFET(s) gate. 15 VCCDR 5V internally regulated voltage. It is used to supply the internal drivers. Filter it to ground with at least 1µF ceramic cap. 16 VCC Supply voltage pin. The operative supply voltage range is from 4.5V to 14V. Table 3. Pin functions I VALLEY I OCL I OCL • 2R DSONLS • --------------------------------- = I PEAK I OCH R OCH • R DSONHS --------------------------------- = |
同様の部品番号 - L6732 |
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同様の説明 - L6732 |
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