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LM2703使用问题

Other Parts Discussed in Thread: LM2703

 LM2703给背光做驱动电路时,遇到如下问题请支持。
附件的电路中,R1\\R2为18欧,实际输出电流17.28mA,电压14.51V。与图中公式I=1.237/18=68mA不符。
当去掉R2,保留R1为36欧,实际输出电流34.41mA,电压15.83V。反而输出会有些提升。
实在是看不懂规格书,不明白其中原由,麻烦解释说明一下。

TM202HVFWUGWA PET1-00.pdf背光.pdf