9.2.1.2.2 Output Voltage Setpoint

The output voltage of a TLVM13610 module is externally adjustable using a resistor divider. A recommended

value for RFBT of 100 kΩ for improved noise immunity compared to 1 MΩ and reduced current consumption

compared to lower resistance values. Calculate RFBB using the following equation :

RFBB= RFBT ×  VREF

VOUT − VREF

(8)

Choose the closest standard value of 24.9 kΩ for RFBB.

9.2.1.2.3 Switching Frequency Selection

Connect a 15.8-kΩ resistor from RT to AGND to set a switching frequency of 1 MHz, which is designed for an

output of 5 V as it establishes an inductor peak-to-peak ripple current in the range of 20% to 40% of the 8-A

rated output current at a nominal input voltage of 24 V.

9.2.1.2.4 Input Capacitor Selection

The TLVM13610 requires a minimum input capacitance of 2 × 10-µF ceramic, preferably with X7R dielectric.

The voltage rating of input capacitors must be greater than the maximum input voltage. For this design, select

two 10-µF, X7R, 50-V, 1210 case size, ceramic capacitors connected from VIN1 and VIN2 to PGND as close as

possible to the module. See Figure 9-13 for recommneded layout placement.

9.2.1.2.5 Output Capacitor Selection

From Table 8-1, the TLVM13610 requires a minimum of 25 µF of effective output capacitance for proper

operation at an output voltage of 5 V at 2.2 MHz. Use high-quality ceramic type capacitors with sufficient

voltage and temperature rating. If needed, connect additional output capacitance to reduce ripple voltage or for

applications with specific load transient requirements.

For this design example, use two 47-µF, 6.3-V or 10-V, X7R, 1210, ceramic capacitors connected close to the

module from the VOUT1 and VOUT2 pins to PGND. The total effective capacitance at 5 V is approximately

52 µF and 38 µF at 25°C and –40°C, respectively.

9.2.1.2.6 Other Connections

Short RBOOT to CBOOT and connect VLDOIN to the 5-V output for best efficiency. To increase phase margin

when using an output capacitance close to the minimum in Table 8-1, a feedforward capacitor, designated as

CFF can be placed across the upper feedback resistor. Place the zero created by CFF and RFBT higher than one

fifth the switching so that it boosts phase but does not significantly increase the crossover frequency. Because

this CFF capacitor can conduct noise from the output of the circuit directly to the FB node of the IC, a 4.99-kΩ

resistor, RFF, must be placed in series with CFF. If the ESR zero of the output capacitor is below 200 kHz, do not

use CFF.

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TLVM13610

SLVSH63 – FEBRUARY 2023

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