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TPS23755变压器问题

Other Parts Discussed in Thread: TPS23755

将TPS23755的输出电压调为14-15V,驱动初级绕组的开关管对地电阻由0.45Ω减为0.33Ω,以此将电源的输出电流加大,变压器仍按照参考demo板的变压器设计。测试发现电路可带的负载减少了,想问一下变压器参数应该怎么修改?