The NCP51752 is an isolated single-channel gate driver with peak source and sink currents of 4.5 A/9 A respectively.
They are designed for high speed switching to drive power MOSFET and SiC MOSFET power switches.
The NCP51752 provides a short and adequate propagation delay.
For improved reliability, dV/dt immunity and faster turn-off, the NCP51752 incorporates an innovative negative bias control.
The NCP51752 also offers other important protection features such as independent Under Voltage Lockout (UVLO) on both drivers.
The block diagram and circuit diagram are shown below.

Next, we will explain the negative bias control function, which is a feature of this product.

NCP51752 is shown in Fig. 54 This provides a simple way to generate a negative bias in the gate drive, as shown in PCB Layout and package leads are power transistors Vgs This is extremely useful when the input generates high ringing.
This gate voltage ringing is generally di/dt and dv/dt It occurs under switching conditions and a negative bias is typically applied to the gate drive to keep the ringing below the threshold voltage and prevent false turn-on.

The NCP51752 is available in a wide variety of configurations to accommodate any type of power transistor.-2V,-3V,-4V,and-5V It provides various options for generating
In addition, the negative bias voltage has a target VEE Value 80% was set to UVLO (Under Voltage Lockout) contained. (Figure 36 reference)

GND2 pin and VEE Capacitor between pins-C(GND2) This creates a voltage across the pins. The voltage on the capacitor is controlled by charging and discharging the current source. This feature allows PCB It minimizes size and cost and is independent of switching frequency and duty cycle. GND2 idea VEE Precisely controls the negative bias voltage between pins.

figure 55 shows a timing chart for negative bias control.
GND2 If the capacitor voltage falls below the specified target threshold voltage,
for example, VC(GND2) < Goal 80% in the case of, GND2 Capacitors are internal current sources I(REGCHG) The target threshold voltage is 80% It will be charged quickly up to
GND2 The capacitor voltage is the target 80% ~ 120% in the case of, GND2 The capacitor is GND2 idea VEE Depending on the voltage difference between the pins, the internal operational transconductance amplifier (OTA) It can be stabilized by.
GND2 If the capacitor voltage exceeds the specified target threshold voltage,
for example, VC(GND2) > Goal 120% If , the internal current source I(REGDIS) teeth, GND2 Capacitor to target threshold voltage 120% It can be discharged up to