DEMO MANUAL SCP-LT8609S-BEVALZ
Rev. 1
4
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
R8
R9
R10
Burst Mode (default)
0
W
Open
Open
External Clock Synchronized
Open
0
W
Open
Pulse Skip/Spread Spectrum
Open
Open
0
W
Pulse Skip
Open
Open
Open
FREQUENCY (RT) PIN CONFIGURATION
The LT8609S allows the user to program the switching fre-
quency (f
SW
) by a single resistor (R2). The default operat-
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
vs Resistor R
2
Value
f
SW
R2 (
Ω
)
f
SW
R2 (
Ω
)
200kHz
221K
1.30MHz
30.1K
300kHz
143K
1.40MHz
27.4K
400kHz
110K
1.50MHz
25.5K
500kHz
86.6K
1.60MHz
23.7K
600kHz
71.5K
1.70MHz
22.1K
700kHz
60.4K
1.80MHz
20.5K
800kHz
52.3K
1.90MHz
19.1K
900kHz
46.4K
2.00MHz
18.2K
1.00MHz
40.2K
2.10MHz
16.9K
1.10MHz
36.5K
2.20MHz
16.2K
1.20MHz
33.2K
