NXP Semiconductors
UM10972
TEA1916DB1262 digital resonant 240 W/12 V power supply demo board
UM10972
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User manual
Rev. 1.1 — 8 June 2018
COMPANY PUBLIC
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5.8 OverPower Protection (OPP)
Tested with a higher current (dynamic overload) on the output voltage, OPP is activated
when the current exceeds 25 A (300 W). This current corresponds with a load condition
that is 25 % higher than the rated power for continuous use.
OPP allows a typical continuously maximum output current of 25 A during 50 ms. Any
higher current, intended to run longer than 50 ms, triggers an OPP. After the 50 ms, a
safe restart follows (OPP protection is reset).
The SNSCAP function of the TEA19161 detects OPP. This function monitors the voltage
across the series capacitor (C211) of the half bridge.
The power capability limitation protection limits the maximum power to 360 W as long as
the time is shorter than 50 ms.
a. OPP protection is triggered at I
out
≈ 27 A (output power is
lost during a safe restart)
b. OPP is not triggered at I
out
≈ 26 A
(1) V
out
(2) GATELS
(3) HBC
(4) I
out
Figure 14. Overpower protection
The power capability limitation level limits the maximum output power to typically 360 W
as long as the time fits within the selected OPP timer. In this example, the time is shorter
than 50 ms. So, when more output current is requested than accepted by the power
capability limitation level, the output voltage drops.
