ADP2300 - can I use 'EN' PIN to connect to external PWM source (~20kHz)?

Question

Hello, 
 I would like to use 'EN' pin to control externally the output by connect it to 50% PWN source (uP 3.3V). 
 And switch to PWM 100% only in specific cases. 
 The external PWM source will have constant frequency ~20kHz. 
 May i connect it to 'EN" without any consequences? 
 The output voltage will be set to 2V and current shall be ~300mA.at that voltage 
 
 best regards 
 M.M.

Fil · Accepted Answer

Hi M.M., 
 I believe you can connect 20kHz signal into EN pin that will turn-on and off the converter switching to that rate. But the concern I am seeing is about what you intend to achieve at the output or the response of output voltage to that rate of turn on/off through EN signal. The output voltage can't change that fast from regulation to zero volt and back or vice-versa. Soft-start time (zero Vout to regulation) is already 1.46ms. If you want to turn-on and off the output in the same rate as the EN signal, you may not be able to do it. 
 Please simulate what you want to achieve in LTspice.)

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ADP2300 - can I use 'EN' PIN to connect to external PWM source (~20kHz)?

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