Texas Instruments TPS53515, User Manual

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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.
6.3 VDD Pin Supply Selection
The controller can be enabled and disabled by J7.
Table 6-3. Enable Selection
SET ON CONNECTION ENABLE SELECTION
R19 = 0 Ω
(1)
VDD pin connected to VIN pins
(1)
R19 = Open VDD pin disconnected to VIN pins
(1) Default setting: the VDD pin connected to the VIN pins through R19.
For power-up, input J7 with proper voltage. The VDD pin input voltage range is from 4.5 V to 25 V.
Configurations www.ti.com
6 TPS53515 Step-Down Converter Evaluation Module User's Guide SLUUAS1C – OCTOBER 2013 – REVISED NOVEMBER 2021
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