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Loss of Regulation when connecting a Load (Viper06)

Question asked by Maher.Ahmed on Jul 10, 2016
Latest reply on Jul 13, 2016 by Patrizia Bellitto
I have used Viper06L (60KHz) as a buck to get 9V output, with no load I have the right output voltage. But when I connect any load (even it is light) the output voltage drops .
As the load resistance decreases the output voltage decreases !!

The same occurs with Viper06X (30KHz) , the output should be 5V , and it is 5V without load , but when connecting a load the output voltage decreases. 
One Led with a 200 ohm resistor drops the output voltage to 2.8V !!
I have tried to increase the output capacitance but no change occurs .