TEA19161CT datasheet(8/44 Pages) NXP

8 / 44 page

NXP Semiconductors

TEA19161CT

Digital controller for high-efficiency resonant power supply

TEA19161CT

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

Product data sheet

Rev. 2 — 26 February 2020

8 / 44

Careful selection of the appropriate diode minimizes the voltage drop between the

SUPREG and SUPHS pins, especially when large MOSFETs and high switching

frequencies are used. A large voltage drop across the diode reduces the gate drive of the

high-side MOSFET.

8.2 System start-up

Figure 5 shows the flow diagram corresponding with Figure 4.

aaa-017754

NO SUPPLY

VSUPIC < Vuvp(SUPIC) or

VSUPREG < Vuvp(SUPREG)

all settings defined

VSNSBOOST > Vstart(SNSBOOST)

PFC disabled

via SNSBOOST

READOUT

SETTINGS

PFC START-UP

LLC START-UP

OPERATING

SUPIC regulated

via SUPHV

VSUPIC > Vstart(SUPIC) and

VSUPREG > Vuvp(SUPREG)

ISNSFB > Ireg(SNSFB)

Figure 5. LLC controller flow diagram

When the SUPIC or SUPREG pins drop to below their stop levels, the TEA19161CT

enters the no supply state. It recharges the SUPIC and SUPREG pins to their start

levels via the SUPHV pin. When the start levels are reached, measuring the external

resistances on the SNSSET, SNSOUT, and GATELS pins initialize the settings.

During the no supply and readout settings states, the SNSBOOST pin is pulled low,

disabling the TEA19162CT PFC. When the settings have been defined, the SNSBOOST

pin is released and the PFC starts up. When the SNSBOOST reaches the minimum level

Vstart(SNSBOOST), the LLC starts switching.

When a small optocurrent is detected (ISNSFB < Ireg(SNSFB)), the output voltage is close

to its regulation level. As the SUPIC pin must then be supplied via the primary auxiliary

winding, charging via the SUPHV is disabled.

TEA19161CT Datasheet(PDF) 8 Page - NXP Semiconductors

TEA19161CT Datasheet(HTML) 8 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

Datasheet Descarga

Enlace URL