TEA2017ABTSLASH2 datasheet(7/67 Pages) NXP

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NXP Semiconductors

TEA2017ABT/2

Digital configurable LLC and DCM/QR PFC controller

8 Functional description

8.1 Supply voltages

The TEA2017ABT includes:

• A high-voltage supply pin for start-up (DRAINPFC)

• A general supply to be connected to an external auxiliary winding (SUPIC pin)

• A floating supply for the high-side driver (SUPHS pin)

8.1.1 Start-up and supply voltage

Initially, the capacitor on the SUPIC pin is charged via the DRAINPFC pin. The

DRAINPFC pin is connected to the drain voltage of the PFC MOSFET. Internally, a

high-voltage current source is located between the DRAINPFC pin and the SUPIC pin

(see Figure 3).

aaa-038658

VALLEYDET

OVP_PROT

Vstart(SUPIC)

I = lch(SUPIC) = f(temp)

xcap discharge

SUPIC

DRAINPFC

PFC

Vprot(ovp)PFC

Figure 3. HV start-up

The maximum current of the internal current source is limited to Ich(SUPIC). To limit the IC

dissipation, the charge current is reduced when the current source exceeds its maximum

temperature.

At start-up, when the SUPIC reaches the Vstart(SUPIC) level, it is continuously regulated to

this start level with a hysteresis (Vstart(hys)SUPIC).

When the start level is reached, it reads the internal MTP (multi-time programmable

memory) and defines the settings.

When the settings have been defined, the PFC starts up. When the SNSBOOST reaches

the minimum level Vstart(SNSBOOST), the LLC also starts switching (see Figure 4 and

Figure 5).

When start-up is complete and the LLC controller is operating, the LLC transformer

auxiliary winding supplies the SUPIC pin. In this operational state, the HV start-up source

is disabled.

TEA2017ABT_2

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 1.1 — 17 May 2023

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