CLK OUTPUT

The MAX16831 EV kit features a buffered digital clock

output, CLKOUT. The MAX16831 PWM clock frequen-

cy is programmed to 300kHz by resistor R13. To syn-

chronize the MAX16831 EV kit to an external clock

signal, connect a clock signal with a 2.8V to 5.5V

logic level and 125kHz to 500kHz square wave at the

RTSYNC PCB pad. Refer to the

Oscillator, Clock, and

Synchronization section in the MAX16831 IC data

sheet for information on setting the MAX16831 IC

PWM frequency.

Output Overvoltage Protection

The maximum voltage on the LED+ PCB pad is limited

to 70.8V, with respect to GND, by a feedback network

formed by resistors R9 and R10. When the voltage at

LED+ exceeds the programmed 70.8V threshold,

PWM switching is terminated and no further energy is

transferred to the load connected between LED+ and

LED-. Refer to the

Setting the Overvoltage Threshold

section in the MAX16831 IC data sheet for setting the

overvoltage threshold.

If the EV kit is turned on with no load, the voltage at

LED+ may rise to unsafe levels. Even though the EV

kit has overvoltage protection, connect the speci-

fied load before powering up the EV kit.

MAX16831 Evaluation Kit

4

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