Device description

ALED6001

16/26

DocID026965 Rev 2

7.2.4

Switching frequency oscillator and external synchronization

The switching frequency of the boost controller is simply set by connecting a resistor

between the FSW pin and ground. The resistor can be calculated according to Equation 4:

Equation 4

Figure 7. Switching frequency vs. setting resistor at the FSW pin

If the FSW pin is tied high (e.g.: connecting it to LDO3), a 600 kHz (typ.) default switching

frequency is set.

In case the boost controller of the ALED6001 has to be externally synchronized, the FSW

pin can be used as synchronization clock input. In this case the external clock must have

a frequency in the 100 kHz - 1 MHz range and a 250 ns minimum pulse duration in order to

ensure internal oscillator locking.

R

K

FSW

f

SW

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