MFS2401AVBA0ES datasheet(32/151 Pages) NXP

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NXP Semiconductors

FS2400

Fail-safe system basis chip with SMPS and LDO, CAN FD transceiver

Dynamic output voltage scaling

The HVBUCK output voltage can be modified while running by using the dynamic voltage scaling (DVS)

function to adapt to the supplied device needs. This is done by setting the bits of the M_REG2_CTRL SPI

14.1.2 HVBUCK clock management

14.1.2.1 Description

The HVBUCK oscillator 20 MHz frequency can be modulated with a triangular or pseudo-random carrier

frequency of 19 kHz, with a ±10 % deviation range around the oscillator frequency. The spread-spectrum

feature can be selected by SPI. The MOD_EN bit enables the spread-spectrum feature and the MOD_CONF

bit selects the triangular or pseudo-random modulation. These two bits are in the M_SYS_CFG SPI register. By

default, the spread-spectrum feature is configured following the OTP configuration.

The main purpose of the spread-spectrum feature is to improve EMC performance by spreading out the energy

of the HVBUCK switching frequency.

14.1.2.2 Spread spectrum

Triangular spread spectrum

The triangular spread spectrum is activated in the M_SYS_CFG SPI register by setting the MOD_EN bit high

and the MOD_CONF bit low. In this configuration, the internal oscillator is modulated with a triangular carrier

frequency of 19 kHz with a ±10 % deviation range of the nominal oscillator frequency.

aaa-051566

20 MHz + 10 %

20 MHz - 10 %

No modulation

(20 MHz)

52.6 µs (19 kHz)

Figure 18. Triangular modulation

Pseudo-random spread spectrum

The pseudo-random triangular spread spectrum is activated in the M_SYS_CFG SPI register by setting the

MOD_EN bit high and the MOD_CONF bit high. In this configuration, the internal oscillator is modulated with a

triangular carrier frequency of 19 kHz with ±10 % deviation range of the nominal oscillator frequency, but two

random commutations on the carrier slope are added in each half period to increase the spectrum content.

aaa-051567

20 MHz + 10 %

20 MHz - 10 %

No modulation

(20 MHz)

Same slope as

triangular modulation

Pseudo random commutation

Figure 19. Pseudo-random modulation

FS2400

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Product data sheet

Rev. 4 — 23 October 2024

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