ZXLD1366DACTC datasheet(6/30 Pages) DIODES

6 / 30 page

ZXLD1366

Document number: DS31992 Rev. 7 - 2

6 of 30

www.diodes.com

May 2012

A Product Line of

Diodes Incorporated

Device Description (cont.)

Actual operating waveforms

VIN = 15V, RS = 0.2Ω, L = 68µH Normal operation.

Output Current (Ch 3) and LX voltage (Ch 2)

VIN = 30V, RS = 0.2Ω, L = 68µH Normal operation.

Output Current (Ch 3) and LX voltage (Ch 2)

VIN = 60V, RS = 0.2Ω, L = 68µH Normal operation.

Output Current (Ch 3) and LX voltage (Ch 2)

Adjusting Output Current

The device contains a low pass filter between the ADJ pin and

the threshold comparator and an internal current limiting resistor

(50k

Ω 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 applications section.

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 60

μA

and switch leakage is below 5

μA.

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