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TEA19362T/1J

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34
NXP Semiconductors
TEA19362T
GreenChip SMPS primary side control IC with fixed frequency operation
TEA19362T All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet Rev. 1 — 9 August 2016
10 / 34
When the system stops switching, the VCCH and VCCL pins are not supplied via the
auxiliary winding anymore. Depending on the protection triggered, V
VCCL
is either
regulated to the V
startup
level via the HV pin or dropped down until the UVLO protection
triggered (see Table 4).
8.6.1 OverPower Protection (OPP)
The overpower protection function is used to realize a maximum output power which is
nearly constant over the full input mains.
For applications intended to operate fully in DCM mode, a constant overpower protection
level can be set by using the flat portion of the OPP curve (see Figure 6). On the other
hand, applications designed to operate in QR mode at maximum power require the OPP
level to be compensated for mains. They can be set to use the variable part of the OPP
curve.
The resistors connected to the AUX pin set the I
AUX
. They determine which part of the
OPP curve is used by the application.
The overpower compensation circuit measures the input voltage via the AUX pin. The
circuit outputs an overpower reference voltage that depends on this input voltage. If
the measured voltage at the ISENSE pin exceeds the overpower reference voltage
(V
opp(ISENSE)
), the DRIVER output is pulled low (the primary stroke is cut short). The
overpower timer starts. In this way, the system limits the power to the maximum rated
value on a cycle-by-cycle base. If the overpower situation persists continuously for
192 ms, an overpower time-out is triggered. Figure 6 shows the overpower protection
curve.
Figure 6. Overpower protection curve
During system start-up, the maximum time-out period is lowered to 38.4 ms. When
the output voltage is within its regulation level, the maximum time-out period returns
to 192 ms, limiting the output power to a minimum at a shorted output. Shortening the
overpower timer ensures that the input power of the system is limited to < 5 W at a
shorted output.
If the load requires more power than allowed by the OPP limit, the output voltage drops
because of the limited output power. As a result, the V
CC
voltage also drops and UVLO
can be triggered. To retain the same response in an overpower situation (whether UVLO
is triggered or not), the system enters the overpower protection mode when overpower
and UVLO are detected. The system entering the protection mode does not depend on
the value of the OP counter.
NXP Semiconductors
TEA19362T
GreenChip SMPS primary side control IC with fixed frequency operation
TEA19362T All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet Rev. 1 — 9 August 2016
11 / 34
8.6.2 OverVoltage Protection (OVP; pins AUX and VCCL)
An accurate output OVP is implemented by measuring the voltage at the AUX pin during
the secondary stroke. As the auxiliary winding voltage is a well-defined replica of the
output voltage, the external resistor divider ratio R
AUX2
/ (R
AUX1
+ R
AUX2
) can adjust the
OVP level.
An accurate OVP circuit is also connected to the VCCL pin. It measures if the VCCL pin
voltage exceeds the level V
ovp(VCCL)
at the end of primary stroke.
An internal counter of four gate pulses prevents false OVP detection which can occur
during ESD or lightning events.
8.6.3 Protection input (PROTECT pin)
The PROTECT pin is a general-purpose input pin. It can be used to trigger a safe
restart. When the voltage on the PROTECT pin is pulled below V
det(PROTECT)
(0.5 V), the
converter is stopped.
The PROTECT pin can be used to create an OTP function. To create the OTP function,
a Negative Temperature Coefficient (NTC) resistor must be connected to this pin. When
the voltage on the PROTECT pin drops to below 0.5 V, overtemperature is detected. The
PROTECT current flowing through the external NTC resistor creates the voltage. The
PROTECT voltage is clamped to maximum 1.4 V. At room temperature, the resistance
value of the NTC resistor is much higher than at high temperatures. Because of the
clamp, the current out of the PROTECT pin is 1.4 V divided by the resistance, which is
much lower than 74 μA.
A filter capacitor can be connected to the PROTECT pin.
To avoid false triggering, an internal filter of 2 ms to 4 ms is applied.
8.6.4 OverTemperature Protection (OTP)
If the junction temperature exceeds the thermal temperature shutdown limit, an
integrated OTP feature ensures that the IC stops switching. OTP is a safe restart
protection.
A built-in hysteresis ensures that the internal temperature must drop 10 °C degrees
before the IC restarts.
8.6.5 Maximum on-time
The controller limits the on-time of the external MOSFET to 55 μs. When the on-time is
longer, the IC stops switching and enters safe restart mode.
8.6.6 Safe restart
If a protection is triggered and the system enters the safe restart mode, the system
restarts after a delay time (t
d(restart)
). An internal current source (I
CC(dch)
) discharges the
voltage on pin VCCL. The discharge allows the conditions at a restart to be similar to
a normal start-up. Because the system is not switching, the VCCL and VCCH pins are
supplied from the mains via the HV pin.
NXP Semiconductors
TEA19362T
GreenChip SMPS primary side control IC with fixed frequency operation
TEA19362T All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet Rev. 1 — 9 August 2016
12 / 34
After the restart delay time (t
d(restart)
), the control IC measures the mains voltage. If the
mains voltage exceeds the brownin level, the control IC activates the PROTECT pin
current source and the internal voltage sources connected to the CTRL pin. When the
voltages on these pins reach a minimum level, the soft start capacitor on the ISENSE pin
is charged and the system starts switching again.
The V
CC
is continuously regulated to the V
startup
level until the output voltage is within the
regulation level again.
8.7 Optobias regulation (CTRL pin)
In a typical application, the output voltage (or current) is sensed on the secondary side
(by a TL431 or a controller such as TEA190x). The feedback signal is passed to the
primary side via an optocoupler. The optocoupler sends the current information to the
CTRL pin of the TEA19362T (see Figure 19 and Figure 20).
The TEA19362T applies a relatively fixed voltage at the CTRL pin (the input impedance
of the CTRL pin is R
int(CTRL)
). It senses the current through the optocoupler. The
TEA19362T compares the current with an internal regulation level I
IO(reg)CTRL
(80 μA).
The difference is integrated with a slow time constant (in ms). It is added to the control
signal that sets the output power. If the optocurrent (at CTRL pin) exceeds the regulation
level (I
IO(reg)CTRL)
), the control signal reduces in this way, which leads to an output power
decrease and vice versa. The optocurrent (at the CTRL pin) slowly regulates towards the
regulation level (I
IO(reg)CTRL
). The result is a constant optocurrent during stable operation
at all output power levels.
aaa-021135
CTRL
A/D
D/A
OFFSET
80 µA
6 kΩ
Ctrl_p
Figure 7. Optobias regulation
Figure 7 shows the slow optocurrent regulation loop.
In addition to the slow optocurrent regulation loop described above, the CTRL current
directly contributes to the internal power control by creating a voltage drop across a 6 kΩ
resistor (See Figure 7). It determines the transient behavior of the power regulation loop,
which remains similar to ICs, like the TEA1836. The control loop responds to load or
line variations through this direct optocurrent contribution, whereas the slow offset loop
simply sets the steady state operation point.
The advantages of this type of regulation are:
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34

TEA19362T/1J

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Buy TEA19362T/1J
Manufacturer:
NXP Semiconductors
Description:
Switching Controllers TEA19362T/SO10//1/REEL 13 Q1 NDP
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New from this manufacturer.
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