PM6600TR datasheet(25/43 Pages) STMICROELECTRONICS

25 / 43 page

PM6600

Operation description

25/43

Figure 44.

OVP threshold setting

7.3

Switching frequency selection and synchronization

The switching frequency of the boost converter can be set in the 200 kHz-1 MHz range by

connecting the FSW pin to ground through a resistor. Calculation of the setting resistor is

made using equation 3 and should not exceed the 80 k

Ω-400 kΩ range.

Equation 4

In addition, when the FSW pin is tied to AVCC, the PM6600 uses a default 660 kHz fixed

switching frequency, allowing to save a resistor in minimum components-count applications.

Figure 45.

Multiple device synchronization

The FSW pin can also be used as a synchronization input, allowing the PM6600 to operate

both as master or slave device. If a clock signal with a 210 kHz minimum frequency is

applied to this pin, the device locks synchronized (300 mV threshold). An Internal timeout

allows synchronization as long as the external clock frequency is greater than 210 kHz.

Keeping the FSW pin voltage lower than 300 mV for more than 1/210 kHz

≈ 5 µs results in

the device turn off. Normal operation is resumed as soon as FSW rises above the

mentioned threshold and the Soft-Start sequence is repeated.

OVSEL

SGND

PM6600

VOUT

VIN

C10

COUT

C13

FSW =

SYNC

SGND

PM6600

AVCC

RFSW

FSW

SYNC

SGND

PM6600

SLAVE

FSW

MASTER

Sync Out

SYNC

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