TEA2017ABTSLASH2 datasheet(39/67 Pages) NXP

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NXP Semiconductors

TEA2017ABT/2

Digital configurable LLC and DCM/QR PFC controller

8.8.2 PFC settings

8.8.2.1 Soft-start time

For the start-up time of the PFC, the following RC time periods can be selected: 13 ms,

25 ms, 51 ms, or 102 ms.

8.8.2.2 Active X-capacitor discharge

When the TEA2017ABT detects that the mains is disconnected, the X-capacitor

discharge is activated after a delay of td(dch). The following delays can be selected:

100 ms, 200 ms, and 400 ms. This function can also be disabled.

8.8.2.3 Mains measurement impedance

To realize a low no-load input power level, the external resistor connected to the

SNSMAINS pin for measuring the mains input voltage is typically 20 MΩ.

However, some applications request a maximum resistance of 10 MΩ. With this bit,

10 MΩ or 20 MΩ can be selected for the external resistor without affecting the mains

voltage-related levels like brownin and brownout.

8.8.2.4 Number of mains resistors

To achieve the lowest possible no-load input power, a single mains sense resistor can be

used. If continuously measuring the mains voltage is necessary, two mains resistors can

be used.

For proper functionality, the resistor value and number of resistors in the application are

required to correspond to the IC settings.

8.8.2.5 PFC mode of operation

The PFC of the TEA2017ABT works in DCM/QR mode. However, the frequency varies

between the minimum and maximum frequency.

The option to disable the PFC can be selected for evaluation purposes.

8.8.2.6 PFC minimum and maximum frequency

The minimum switching frequency of the PFC can be set within a range from 25 kHz to

80 kHz. The PFC always waits until the PFC coil is demagnetized before starting the next

cycle. As a result, the switching frequency can drop to below the minimum frequency.

The maximum frequency can be set within a range from 75 kHz to 250 kHz.

8.8.2.7 Burst mode: Output voltage ripple

When the PFC enters burst mode, it stops switching when the SNSBOOST voltage,

which reflects the PFC output voltage, reaches its regulation level and the LLC stops

switching. When the voltage at the SNSBOOST pin has dropped to a programmed level,

the PFC is enabled again. For the difference between these two levels the following

values can be selected: 70 mV, 105 mV, 140 mV, 175 mV, 210 mV, 245 mV, and 280 mV.

These values typically correspond with a ripple on the PFC output voltage of 10 V, 16 V,

22 V, 28 V, 34 V, 40 V, and 46 V.

TEA2017ABT_2

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Product data sheet

Rev. 1.1 — 17 May 2023

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