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TEA19161T/2Y

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P46
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 10 of 46
NXP Semiconductors
TEA19161T
Digital controller for high-efficiency resonant power supply
7.3 LLC system regulation
A typical resonant controller regulates the output power by adapting the operating
frequency.
If the power drops and so the voltage of the LLC converter exceeds the targeted
regulation level (12 V or 19.5 V typical), the optocurrent increases and the voltage at the
SNSFB decreases (see Figure 6
). The resonant controller then increases the frequency
according to its internal frequency control curve. Because of the higher frequency, the
power to the output is reduced and the output voltage drops. If the output voltage
becomes too low, the controller lowers the system frequency, increasing the output power.
In this way, the system regulates the output power to the required level.
As a small change in frequency gives a significant change in output power, frequency
control has a high gain of the control loop. To increase the efficiency at low loads, most
converters switch to burst mode as soon as the output power is below a minimum level.
The burst mode level is mostly derived from the voltage on the SNSFB pin. For a
frequency controlled resonant converter, it implies that the burst mode is entered at a
certain frequency instead of at a certain load. A small variation of the resonant
components then results in a significant variation in power level at which the burst mode is
activated.
In the TEA19161T, the control mechanism is different. The advantage is a constant gain
of the control loop and a burst mode which is derived from the output power. The
TEA19161T does not regulate the output power by adjusting the frequency but by the
voltage across the primary capacitor.
Fig 6. Resonant frequency controller
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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 11 of 46
NXP Semiconductors
TEA19161T
Digital controller for high-efficiency resonant power supply
The input power (related to the output power) of a resonant converter can be calculated
with Equation 1
:
(1)
Equation 1
shows that the input power has a linear relationship with the capacitor voltage
difference V
Cr
.
Figure 7
shows an alternative explanation of the linear relationship between the input
power and the energy stored in the resonant capacitor.
When the high-side switch is on, a primary current is flowing through the transformer and
resonant capacitor C
r
as indicated by the red line. Half the energy the input delivers is
transferred to the output. The other half charges resonant capacitor C
r
. The voltage
across the resonant capacitor increases.
When the high-side switch is off and the low-side switch is on, the energy which is stored
in resonant capacitor C
r
is transferred to the output and its voltage decreases. In this way,
the linear relationship between the increase of the resonant capacitor voltage and the
output power can be seen.
Although the TEA19161T uses the primary capacitor voltage as a regulation parameter,
all application values, like the resonant inductances, resonant capacitor, and primary
MOSFETs remain unchanged compared to a frequency controlled LLC converter. A
secondary TL431 circuitry in combination with an optocoupler connected to the primary
SNSFB pin continuously regulates the output voltage.
Fig 7. Linear relationship between input power and energy stored in C
r
P
in
V
boost
I
boost
V
boost
V
Cr
C
r
f
sw
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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 12 of 46
NXP Semiconductors
TEA19161T
Digital controller for high-efficiency resonant power supply
7.3.1 Output power regulation loop
Figure 8 shows the output power regulation loop of V
cap
control as used by the
TEA19161T. Figure 9
shows a corresponding timing diagram.
When the divided resonant capacitor voltage (V
SNSCAP
) exceeds the capacitor voltage
high level (V
hs(SNSCAP)
), the high-side MOSFET is switched off (see Figure 9 (t1). After a
short delay, the low-side MOSFET is switched on. Because of the resonant current, the
resonant capacitor voltage initially increases further but eventually drops.
Fig 8. Regulation loop V
cap
control
Fig 9. Timing diagram of the regulation loop
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P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P46

TEA19161T/2Y

Mfr. #:
Buy TEA19161T/2Y
Manufacturer:
NXP Semiconductors
Description:
Switching Controllers TEA19161T/SO16//2/REEL 13 Q1 DP
Lifecycle:
New from this manufacturer.
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