NOVOSENSE Launched New 120V Half-bridge Driver NSD1224 Series with Interlock Function and Negative Withstand Voltage of Input Pin of -10V
NOVOSENSE has launched the 120V half-bridge driver NSD1224 series, which has 3A/-4A peak driver current capability, is integrated with high-voltage bootstrap diode, and is available in different versions including enabling, interlock, and Undervoltage protection, as well as various packages including SOP8, HSOP8, DFN10, and DFN8. It is widely used in micro-inverters, power optimizers, power modules, new energy vehicles, and other application scenarios.
I NSD1224 features:
Withstand the voltage of VDD power of 20V
Withstand voltage at HSpin of -10V to 115V
Negative withstand voltage of input pin of -10V
HS pin withstand dv/dt up to 50V/nsPeak driver current 3A/-4A
Compatible with CMOS/TTL level input
Input interlock function
Independent UVLO protection for high-side and low-side output
Integrated high voltage bootstrap diode
Input/output delay of less than 16ns
Transmission delay matching between high and low sides is less than 1ns
DFN10 package with enabling pin for static power consumption as low as 7μA in standby mode
Package available in SOP8, HSOP8, DFN10 and DFN8
Junction temperature range of -40℃ to 150℃
II NSD1224 performance advantage:
1. NSD1224 has an interlock function, which can effectively avoid shooting through of the power stage due to input interference.
In the power supply application, the input pin of the half-bridge driver chip is susceptible to interference due to the influence of high-frequency switching noise, which may cause input high at both the high and low sides, resulting in output high at both the high and low sides of the driver chip, cause shoot through of power stage, and damage to the power supply equipment.
The NSD1224 triggers an interlock mode when both inputs are at high levels at the same time, in which case both the high-side and low-side output are low at the same time, and only when either input becomes low level will the output return to the normal state following the input. The interlock function of NSD1224 effectively avoids shoot-through caused by input signal interference and improves the reliability of the system.
Test waveform of NSD1224 interlock function
2. The input pin of NSD1224 can withstand a negative voltage of -10V, which solves the problem of a negative voltage peak in the input of the driver chip.
In power applications, due to the influence of MOSFET high-frequency switches, transient current will be generated in the GND circuit, and there will be parasitic inductance due to the PCB wiring between the controller and the driver. The interaction between the transient current and the parasitic inductance will produce a negative voltage peak in the input pin of the driver chip, resulting in a logic error or even damage to the driver chip. The NSD1224 input pin is improved in respect of the negative withstand voltage, which can be off -10V (recommended working value: -5V), thereby improving the reliability of the chip and lowering the requirements for system design.
Negative withstand voltage test waveform of NSD1224 input
3. NSD1224 with HS pin with a negative withstand voltage of -10V and dv/dt immunity of 50V/ns, applicable for high-frequency and efficient switching power supply applications.
With the continuous improvement of power efficiency requirements, the switching speed of MOSFET is becoming faster and faster, so as to reduce switching losses. The di/dt and parasitic inductance caused by high-speed switching will generate a transient negative voltage in the HS pin, which is likely to cause the driver chip to be locked or even damaged. The HS pin of NSD1224 can withstand a negative voltage of -10V (recommended working value: -8V), which effectively solves the application problem of high-frequency and efficient switching power supply. In addition, the HS pin of the NSD1224 can withstand 50V/ns common-mode transients and has strong resistance to common-mode interference.
Negative withstand voltage test waveform of NSD1224 HS pin
III List of NSD1224 series
- 【Datasheet】NSD1224LA High Reliability, ЗA/-4A 120V Half-Bridge Gate Driver, with Interlock Preliminary Datasheet (EN) 0.4
- 【Datasheet】NSD1224LA High Reliability, 3A/4A 120V Half-Bridge Gate Driver, with Interlock
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