仿真只能運行50ms,1844輸出的驅動波形也對,但輸出電壓不是設定的15V,而是30V左右,顯示的直流偏置點明顯不對,輸出窗口提示:
Simulation Profile:  SCHEMATIC1-開關電源3844 ---------------
** Profile: "SCHEMATIC1-3844"  [ F:\CAD\\1844\3844-pspicefiles\schematic1\3844.sim ]
Reading and checking circuit
Circuit read in and checked, no errors
Calculating bias point for Transient Analysis
X_U1.x78.n1 forced to X state for bias point
X_U1.x78.n1 forced to X state for bias point
X_U1.x78.n1 forced to X state for bias point
X_U1.x78.n1 forced to X state for bias point
Unable to converge all DtoA interface devices
Bias point calculated
Transient Analysis
(post_AtoD_chg) digital_time=55225194, CUR_DIG_TIME=55225224
(post_AtoD_chg) digital_time=61689645, CUR_DIG_TIME=61689721
(post_AtoD_chg) digital_time=61689655, CUR_DIG_TIME=61689721
(post_AtoD_chg) digital_time=61689675, CUR_DIG_TIME=61689721
(post_AtoD_chg) digital_time=61689699, CUR_DIG_TIME=61689721
(post_AtoD_chg) digital_time=62189089, CUR_DIG_TIME=62189183
(post_AtoD_chg) digital_time=62189116, CUR_DIG_TIME=62189183
(post_AtoD_chg) digital_time=62189148, CUR_DIG_TIME=62189183

那位高手知道是怎么回事嗎?