TEA19161CT datasheet(7/44 Pages) NXP

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NXP Semiconductors

TEA19161CT

Digital controller for high-efficiency resonant power supply

TEA19161CT

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Product data sheet

Rev. 2 — 26 February 2020

7 / 44

aaa-017753

no supply

readout settings

off

PFC start-up

LLC start-up

operating

ISNSFB > Ireg(SNSFB)

Vstart(SNSBOOST)

Vstart(SUPIC)

supic_charge

lSUPIC

VSUPIC

llim(SUPHV)

< 20 mA

pulldown_snsboost

SNSBOOST

mode of operation

Vout

Vstart(hys)SUPIC

Vrst(SUPIC)

off

Figure 4. Start-up sequence and normal operation

8.1.2 Regulated supply (SUPREG pin)

The voltage range on the SUPIC pin exceeds that of the maximum external MOSFETs

gate-source voltage. So, the TEA19161CT incorporates an integrated series stabilizer.

The series stabilizer creates an accurate regulated voltage (Vintregd(SUPREG) = 11 V) at the

buffer capacitor CSUPREG. The stabilized voltage is used to:

• Supply the internal low-side LLC driver

• Supply the internal high-side driver using external components

• As a reference voltage for optional external circuits

To ensure that the external MOSFETs receive sufficient gate drive, the voltage on the

SUPREG pin must reach Vuvp(SUPREG) before the system starts switching. If the SUPREG

voltage drops to below this undervoltage protection level, the system restarts.

8.1.3 High-side driver floating supply (SUPHS pin)

External bootstrap buffer capacitor CSUPHS supplies the high-side driver. The bootstrap

capacitor is connected between the high-side driver supply, the SUPHS pin, and the

half-bridge node, HB. CSUPHS is charged from the SUPREG pin using an external diode

DSUPHS (see Figure 27).

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