Analog Devices Linear ADI Power SCP-LT8609S-BEVALZ Demo Manual page 4

DEMO MANUAL SCP-LT8609S-BEVALZ
SYNC PIN CONFIGURATION
The table below shows the various configurations possi-
ble with the SYNC pin.
If clock synchronization option is desired, the SCP-
LT8609S-BEVALZ can be driven from an external source
via the optional SMA connector.
Table 4. SYNC Pin Configuration
MODE
Burst Mode (default)
External Clock Synchronized
Pulse Skip/Spread Spectrum
Pulse Skip
4
R8 R9 R10
0W Open Open
Open 0W Open
Open Open 0W
Open Open Open
FREQUENCY (RT) PIN CONFIGURATION
The LT8609S allows the user to program the switching fre-
quency (f ) by a single resistor (R2). The default operat-
SW
ing frequency is 2.0MHz. Note that changing the switching
frequency may affect other parameters and likely will ne-
cessitate a change in inductor and compensation compo-
nent values. Contact the SCP team for support if shifting
the switching frequency greater than ±10%.
Table 5. Switching Frequency f
SW
f R2 (Ω)
SW
200kHz 221K
300kHz 143K
400kHz 110K
500kHz 86.6K
600kHz 71.5K
700kHz 60.4K
800kHz 52.3K
900kHz 46.4K
1.00MHz 40.2K
1.10MHz 36.5K
1.20MHz 33.2K
vs Resistor R Value
2
f R2 (Ω)
SW
1.30MHz 30.1K
1.40MHz 27.4K
1.50MHz 25.5K
1.60MHz 23.7K
1.70MHz 22.1K
1.80MHz 20.5K
1.90MHz 19.1K
2.00MHz 18.2K
2.10MHz 16.9K
2.20MHz 16.2K
Rev. 1