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NCV8184DG Datasheet(PDF) 5 Page - ON Semiconductor |
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NCV8184DG Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 20 page NCV8184 http://onsemi.com 5 CIRCUIT DESCRIPTION ENABLE Function By pulling the VREF/ENABLE lead below 0.8 V, (see Figure 16 or Figure 17), the IC is disabled and enters a sleep state where the device draws less than 20 mA from supply. When the VREF/ENABLE lead is greater than 2.1 V, VOUT tracks the VREF/ENABLE lead normally. Output Voltage The output is capable of supplying 70 mA to the load while configured as a similar (Figure 13), lower (Figure 15), or higher (Figure 14) voltage as the reference lead. The Adj lead acts as the inverting terminal of the op amp and the VREF lead as the non−inverting. The device can also be configured as a high−side driver as displayed in Figure 18. Figure 13. Tracking Regulator at the Same Voltage Figure 14. Tracking Regulator at Higher Voltages VIN VOUT GND GND VREF/ GND GND Adj ENABLE Loads 5.0 V B+ C1* 1.0 mF C2** 10 mF VOUT, 70 mA VOUT + VREF VIN VOUT GND GND VREF/ GND GND Adj ENABLE Loads VREF B+ C1* 1.0 mF C2** 10 mF VOUT, 70 mA RA RF VOUT + VREF(1 ) RE RA ) C3*** 10 nF C3*** 10 nF Figure 15. Tracking Regulator at Lower Voltages Figure 16. Tracking Regulator with ENABLE Circuit VIN VOUT GND GND VREF/ GND GND Adj ENABLE Loads VREF B+ C1* 1.0 mF C2** 10 mF VOUT, 70 mA VOUT + VREF( R2 R1 ) R2 ) R2 R1 VIN VOUT GND GND VREF/ GND GND Adj ENABLE from MCU VREF B+ C1* 1.0 mF C2** 10 mF VOUT, 70 mA R C3*** 10 nF C3*** 10 nF Figure 17. Alternative ENABLE Circuit Figure 18. High−Side Driver VIN VOUT GND GND VREF/ GND GND Adj ENABLE 10 mF VIN VOUT GND GND VREF/ GND GND Adj ENABLE MCU B+ 70 mA VOUT + B )* VSAT ** C2 is required for stability. * C1 is required if the regulator is far from the power source filter. In case of power supply generates voltage ripple (e.g. DC-DC con- verter) a passive low pass filter with C1 value at least 1 mF is required to suppress the ripple. The filter should be designed according to particular operating conditions and verified in the application. 70 mA I/O NCV8501 6.0 V−40 V VIN 100 nF VREF (5.0 V) mC To Load (e.g. sensor) C1* 1.0 mF C3*** 10 nF C3*** 10 nF *** C3 is recommended for EMC susceptibility |
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