About LT1931 power output NG

   HI.  

   I uses negative power output IC LT1931ES5.

   Previously, the device had no problems. 

   But, The LT1931 purchased this time can not a voltage trigger.

   As soon as the negative voltage is initially output, it drops to 0v.

   I bought it an authorized agency..  

   Refer to the attached circuit.  please reply... thank you...

                                                                          - in ku park - 

   

    

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