We designed the Half-Bridge MOSFET Driver circuit using LM5105 as Figure 1.
We are trying to drive in 60Hz Acrive-Low, High-side 16.6ms and Low-side 1.8μs continuously.
And other information is described below.
VDRV_L: Referential voltage of this circuit (NOT GND)
VDRV_H: Min 5V, Max 15V (variable by user)
VDD: 12V
VSS: 0V (VDRV_L)
EN: 3.3V
DIN: High=3.3V, Low=0V
DOUT is not connected to any load.
We carried out actually such driving and found problems.
A waveform of DOUT falls very slowly.
It takes longer time than 1.8μs to be Low-level completely as Figure 2.
And HB voltage descends gradually in a High period as Figure 3.
What is the cause of these problems?
And, we would like to drive this circuit without DOUT slow falling down.
Do you have any idea to improve this situation?
Thank you.
<< Figure 2>>
<< Figure 3 >>