Texas Instruments SWIFT TPS548A20, Руководство пользователя

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6 Configurations
All Jumper selections must be made prior to applying power to the EVM. Configure this EVM using the following
configuration selections.
6.1 Switching Frequency Selection
Switching frequency can be changed as shown in Table 6-1 .
Table 6-1. Switching Frequency Selection
SWITCHING
FREQUENCY
(1)
(ƒ
SW
) (kHz)
RESISTOR DIVIDER RATIO
(R
DR
)
EXAMPLE RF FREQUENCY
COMBINATIONS
R
RF_H
(kΩ) R
RF_L
(kΩ)
1000 > 0.557 1 300
850 0.461 180 154
750 0.375 200 120
600 0.297 249 105
500 0.229 240 71.5
400 0.16 249 47.5
300 0.096 255 27
200 < 0.041 270 11.5
(1) Default Setting: 1 MHz.
For different switching frequency setting, please change R3 and R4 as shown in Table 6-1 .
6.2 Mode Selection
The MODE can be set by J5.
Table 6-2. Mode Selection
JUMPER SET TO: MODE SELECTION
1 to 2 pin shorted FCCM with 2x RC time constant
3 to 4 pin shorted
(1)
FCCM
(2)
with 1x RC time constant
(1)
5 to 6 pin shorted FCCM
(2)
with 2x RC time constant
7 to 8 pin shorted Auto-skip mode with 2× RC time constant
9 to 10 pin shorted Auto-skip mode with 1× RC time constant
(1) Default setting.
(2) The device enters FCCM after PGOOD goes high.
www.ti.com Configurations
SLUUBC0A – DECEMBER 2015 – REVISED AUGUST 2021
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TPS548A20 SWIFT™ Step-Down Converter Evaluation Module User's Guide 9
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