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ADP8140 - short pulses without delay

Hi all,

I developed a new design where I use the ADP8140 for an optical stimulation device.

The ADP is operated in the error amplifier mode with an analog dimming voltage. Until now everything seems to be fine.

But now I want to stimulate with short pulses (~1ms). What's the easiest way to realize these short pulses. I already noticed, that I can't use the EN input, since the startu sequence takes to long and if I use the VT input, the LEDs doesn't turn off completely (~200µA).

Is there any solution for this problem?

Best regards

Stephan