Original question:
用了一个芯片LM5069，这个芯片规格书上写的是用于24V或者48V系统，我是使用这个电路用在12V电源模块的输出端，电源模块是110V/12V，150W。
当负载启动电流较大，无法正常输出。
输出浪涌抑制，如果电流一超过就关闭，始终无法启动，这个芯片能否在电流达到峰值时，按照最大电流输出，而不是直接停止？
我用示波器捕捉了一下负载的启动电流，大约50A持续2uS。
麻烦给看一下，是什么原因？
R74=47K，
输出连接电子负载，
如果先打开电子负载，电源板直接上电110V，
1、电子负载的CC模式，电子负载设置电流5.6A，可以输出，电子负载设置电流5.8A，就不能输出了
2、但是在CW模式下(电子负载的恒功率模式，设置60W)，无法输出。
如果先关闭电子负载，电源板上电110V，后，再打开电子负载，
1、电子负载的CC模式，电子负载设置电流5.8A，可以输出，
2、在CW模式下(电子负载的恒功率模式，设置60W)，可以输出，
是因为先开启电子负载，启动电流太大过流保护了吗
Lm5069-2 is used in the output end of the power module for surge suppression, and LM5050-2 is connected to the back end for parallel connection between two power boards (the power board is separate, so the LM5069 is placed in front of the LM5050).
The LM5069-2 datasheet is for 24V or 48V systems.but I use Power module of the power module: Input 110V, output 12V, power 150W.
The parameters in the figure are adjusted.
Power resistance: R74=47K,
OVLO: R70 = 15K,R72 = 3K;
UVLO: R71 = 15K,R73 = 4.7K;
RS = 4mΩ;
Under the above parameters, the maximum output current under normal temperature is 11.3A. Adjust the current or power through the electronic load. Turn off the output when the current is greater than 11.4A.
The problem phenomena are as follows:
1, for the whole machine test (rated power of 60W) the whole machine can not start. One of the boards is connected to the DC power supply to test the starting current 50A and duration 2uS. I guess it may be that the starting current of the board connected to the power board is too large, resulting in the overcurrent detection failure of LM5069.
The power board has sound;
2, the power board output connected to the electronic load test: divided into two cases.
If you turn on the electronic load first,
a, electronic load setting CC mode (constant current), electronic load set current 5A. The input end of the power board is directly powered on 110V, which can be output in a few cases, but cannot be output in most cases.
b, electronic load setting CR mode (constant resistance), electronic load set resistance 1 ohms. The input end of the PSU is directly powered on 110V and can output each time.
c, electronic load setting CW mode (constant power mode), can not output, power set 1W can not output, constant power mode, the output current is too large.
If the electronic load is turned off first, after the power board is powered on 110V, the electronic load can be turned on every time;
a, electronic load setting CC mode (constant current), electronic load setting current 11.2A.
b, electronic load setting CR mode (constant resistance), electronic load set resistance 1 ohms.
c, electronic load setting CW mode (constant power mode), electronic load set power 120W.
When the LM5069 cannot be output, there is a sound during frequent restarts. A slight beep. Is the sound normal? Is that the MOS tube? Or does the LM5069 make its own sound?
The waveform of the Fault Timer pin with a capacitance of 22nF is as follows:
The waveform of the Fault Timer pin with a capacitance of 104nF (22 nF ||82nF) is as follows:
Capture pin VIN, pin TIMER waveform as follows, TIMER voltage can always be lower to 0.3V, and restart LM5069.
The waveform of a restart is developed, and it is found that the VIN voltage drops to 10.2V during restart.
In the calculator, the minimum VIN voltage is greater than 10V. Is this the cause of the restart?
With the same package as LM5069, PIN2PIN, is there any other chip that can be used for 12V with lower operating voltage?
In the figure below, how to explain the waveform in the blue ellipse? Is it a restart under voltage and a restart over voltage?
