uc3842仿真開關(guān)電源，voltages failed出錯的討論

用multisim 13可以仿真，用orcad 16.3仿真出現(xiàn)voltages failed錯誤。電路參數(shù)是一樣的。不知道問題如何解決。請高手指點(diǎn)。不勝感激！

multisim 13仿真圖：

orcad 16.3仿真出錯：

錯誤如下：

Convergence problem in transient bias point calculation

These voltages failed to converge:

V(N17093) = -363.25mV \ -2.022nV

V(X_U1.xinstuc3842.18) = -363.25mV \ -2.022nV

These supply currents failed to converge:

I(X_U1.xinstuc3842.XU18.EV24) = 473.40uA \ 471.40uA

I(X_U1.xinstuc3842.XU18.VV7) = 473.40uA \ 471.40uA

Simulation paused

orcad16.3 uc3842附件：

我的看法：看提示是靜態(tài)點(diǎn)電壓、電流不符合uc3842模型里的電壓、電流范圍。但在uc3842 Vcc 7腳加上100歐電阻，也出錯。不知如何解決？