TEA19161T All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet Rev. 1 — 10 March 2016 8 of 46
NXP Semiconductors
TEA19161T
Digital controller for high-efficiency resonant power supply
7.1.2 Regulated supply (SUPREG pin)
The voltage range on the SUPIC pin exceeds that of the maximum external MOSFETs
gate-source voltage. So, the TEA19161T incorporates an integrated series stabilizer. The
series stabilizer creates an accurate regulated voltage (V
intregd(SUPREG)
=11V) at the
buffer capacitor C
SUPREG
. 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 V
uvp(SUPREG)
before the system starts switching. If the SUPREG
voltage drops to below this undervoltage protection level, the system restarts.
7.1.3 High-side driver floating supply (SUPHS pin)
External bootstrap buffer capacitor C
SUPHS
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. C
SUPHS
is charged from the SUPREG pin using an external diode
D
SUPHS
(see Figure 27).
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.
