I am using LTSpice to optimise component parameters for the LT3932 Buck LED driver in preparation for a new design.
The model mainly works well, however I have found that the EN/UVLO pin does not respond to falling voltage.
From the datasheet…
Thank you for the reply and the advice to use the LT3932. Somehow It was not suggested although I was looking exactly for this kind of controller, I guess the LT3922 is just more popular. Maybe a hint, next to the example application in each controller…
After poring over Linear Tech datasheets, it seems that the part we want is the LT3932. It is specifically designed for LED flash applications and apparently can support a very long (essentially infinite) PWM off-time and will supply full current to the…
The LT3518 is not designed for short-circuit protection.
More recent ICs such as the LT3922, LT3795, LT3762, LT3932, LT8391A and other LED drivers now have the short-circuit protection which you are looking for.
I hope this helps,
最近关注单片、同步、降压型 DC/DC 转换器LT3932,该器件具内部 36V、2A 电源开关和一个内部 PWM 发生器。其固定频率、峰值电流模式控制能针对高达 2A 的 LED 串准确地调节电流在 ±1.5% 内。其集成的 PWM 发生器提供 128:1 调光比。如果需要高达 5000:1 的调光比，那么 LT3932 和一个外部 PWM 发生器就可适合这类应用。LT3932 的 3.6V 至 36V 输入电压范围非常适合多种应用，包括汽车、工业和建筑照明。其 Silent Switcher
When using the LT3932 for flash applications, the first "flash" pulse is used to help the part find where to regulate the following pulses, but isn't a perfect pulse itself (hence the long rise time). In a well designed system, the following…
Customer went for offline support. Considered close.
Dimming at microsecond intervals is extremely fast for PWM dimming. If you consider a pulse with a 2 microsecond period, that's 500kHz dimming. Even operating the LT3475 at 2MHz switching frequency there wont be many switching cycles to regulate…