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NCP51530 Datasheet(PDF) 17 Page - ON Semiconductor |
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NCP51530 Datasheet(HTML) 17 Page - ON Semiconductor |
17 / 25 page NCP51530 www.onsemi.com 17 and is not affected by the VB status. This ensures proper charging of the bootstrap capacitor to bring the high side bias supply VB above UVLO voltage. Both the VCC and VB UVLO circuits are provided with hysteresis feature. This hysteresis feature avoids errors due to ground noise in the power supply. The hysteresis also ensures continuous operation in case of a small drop in the bias voltage. This drop in the bias can happen when device starts switching MOSFET and the operating current of the device increases. The UVLO feature of the device is explained in the Figure 30. Figure 29. NCP51530 Turn ON−OFF Paths OUTPUT STAGES The NCP51530 is equipped with two independent drivers. The output stage of NCP51530 has 1.7 A/2.2 A current source/sink capability which can effectively charge and discharge a 1 nF load in 15 ns. The outputs of NCP51530 can be turned on at the same time and there is no internal dead−time built between them. This allows NCP51530 to be used in topologies like two switch forward converter. The figure below show the output stage structure and the charging and discharging path of the external power MOSFET. The bias supply VCC or VB supply the energy to charge the gate capacitance Cgs of the low side or the top side external MOSFETs respectively. When a logic high is received from input stage, Qsource turns on and VCC/VB starts charging Cgs through Rg. Once the Cgs is charged to the drive voltage level the external power MOSFET turns on the external MOSFET to discharge to GND/HB level. When a logic low signal is received from the input stage, Qsource turns off and Qsink turns on providing a path for gate terminal of As seen in the figure, there are parasitic inductances in charging and discharging path of the Cgs. This can result in a little dip in the bias voltages VCC/VB. If the VCC/VB drops below UVLO the power supply can shut down the device. |
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