Part Number: LM5157EVM-FLY Other Parts Discussed in Thread: LM5157 Hi Stefan,
As the datasheet of LM5157, the SS time can be calculated in the formula.
The capacitor C_29 is 10nF and the calculated SS time is 1ms.
The blue curves is the output…
Part Number: LM5157EVM-FLY Hi, expert!
In the application notes ( 3.2.2 Primary Winding Inductance Selection ), "The falling slope of the transformer current should be small enough to prevent sub-harmonic oscillation in applications with a duty cycle…
Part Number: LM5157EVM-FLY Hi,
In the guidebook, the waveform of hiccup mode is shown. In the hiccup mode, 64 cycles current limits are detected, the switching is stopped and restart after 32768 cycles. As the frequency is 250kHz, this time of detection…
Part Number: LM5157EVM-FLY Other Parts Discussed in Thread: LM5157 Hi Stefan,
The experiments shows that the soft start time of flyback is related with the supply voltage.
In the figure, the blue waveform is the main output voltage. With the supply…
Part Number: LM5157EVM-FLY Hi, expert!
The output voltage is abnormal and didn't reach to 10V or 20V when I test the EVM-FLY with the minimum supply voltage (8V) and heavy load (100% load of Vo1 and Vo4, by the way, Vo2 and Vo3 is no-load). Actually…
Part Number: LM5157EVM-FLY Other Parts Discussed in Thread: LM5155 Hello E2E,
I'd like to modify the LM5157EV-FLY from string voltage FB to coupler FB. I checked the User's guide, that the FB circuit with coupler has not connect to Vout. To change to…
Part Number: LM5157EVM-FLY
Hi team,
Could you please tell me how to determined the output current? for EVM, could I change the output current? if I can, how to set. the output current only can support to 75mA. I am curious why the EVM set this current…
Part Number: LM5157EVM-FLY Other Parts Discussed in Thread: LM5157 在用LM5157设计flyback时，把ti.com上申请的开发板的设计数据输入计算表格中，发现原边电感感值Lm的推荐值(23.5uH)和《How to Design an Isolated Flyback Converter Using LM5157x/LM5158x》中给出的（13.1uH）不一样。但是如果把表格中的maximum V(supply)改成8V,那么计算结果是13…
Part Number: LM5157EVM-FLY Hi Experts,
Regarding to the LM5157EVM-FLY, the three isolated outputs are in different current.
1. May I know how to set these output current?
2. From my perspective, three phases mean the three output will be the same…
