ZXLD1356QDACTC datasheet(6/28 Pages) DIODES

6 / 28 page

ZXLD1356Q

Document number: DS37077 Rev. 2 - 2

6 of 28

www.diodes.com

October 2015

ZXLD1356Q

Device Description (Continued)

Adjusting Output Current

The device contains a low pass filter between the ADJ pin and the threshold comparator and an internal current limiting resis

tor (50kΩ nom)

between ADJ and the internal reference voltage. This allows the ADJ pin to be overdriven with either DC or pulse signals to change the VSENSE

switching threshold and adjust the output current.

Details of the different modes of adjusting output current are given in the Application Information section, starting on Page 17.

Output Shutdown

The output of the low pass filter drives the shutdown circuit. When the input voltage to this circuit falls below the threshold (0.2V nom.), the

internal regulator and the output switch are turned off. The voltage reference remains powered during shutdown to provide the bias current for

the shutdown circuit. Quiescent supply current during shutdown is nominally 60µA and switch leakage is below 5µA.

Actual Operating Waveforms

Normal operation. Output current (Ch3) and LX voltage (Ch2)

VIN = 15V, RS = 0.36V, L = 68µH

VIN = 30V, RS = 0.36V, L = 68µH

VIN = 60V, RS = 0.36V, L = 68µH

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