，要求工作电压是10--24V，其他参数不做要求
UC3842只能工作在16V以上，所以不适合，看了数据手册，一知半解
也不能说UC3842不适合，我也不知道UC3842是否适合，
看了UC3842的数据手册，望文生义，请问下面图片红线当中的开始阀值电压和最少工作电压，两个参数有什么不同？？
还有下面是对收据手册进行翻译，16V开 10V关，那么12V的时候，是开还是关？？
Differences between members of this family are the
这个系列当中，各个成员之间的区别是低压阀值锁死，和最大周期范围，
under-voltage lockout thresholds and maximum
duty cycle ranges.
The UC3842 and UC3844 have
UVLO thresholds of 16V (on) and 10V (off), ideally
UC3842和UC3844有低压阀值，16V开 10V关
suited off-line applications
很好的适合离线应用
The corresponding
thresholds for the UC3843 and UC3845 are 8.5 V
and 7.9 V. The UC3842 and UC3843 can operate
to duty cycles approaching 100%. A range of the
zero to < 50 % is obtained by the UC3844 and
UC3845by the additionof aninternal toggleflip flop
which blanks the output off every other clock cycle. |
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