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TEA18361T/1J

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29
TEA18361T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 2 — 12 December 2013 10 of 29
NXP Semiconductors
TEA18361T
GreenChip SMPS control IC
[1] When the voltage on the PROTECT pin is between V
th(pd)(PROTECT)
and V
det(PROTECT)
, the clock of the delay
counter is changed from the driver pulse to 1 ms internal pulse.
When the system stops switching, the VCC pin is not supplied via the auxiliary winding
anymore. Depending on the protection triggered, the VCC is regulated to V
startup
via the
HV pin (see Table 3
).
Releasing the latched protections or shortening the safe restart timer can be achieved by
removing or shorting the mains voltage. This is called a fast latch reset. It is mainly used
to shorten the test time in production (See Section 7.6.8
).
7.6.1 OverPower Protection (OPP)
The overpower function is used to realize a maximum output power which is nearly
constant over the full input mains.
The overpower compensation circuit measures the input voltage via the AUX pin and
outputs two reference voltages (see Figure 1
). If the measured voltage at the ISENSE pin
exceeds the highest reference voltage (V
opc(ISENSE)
) the DRIVER output is pulled low. If
the measured ISENSE voltage exceeds the lower reference voltage (V
opp(ISENSE)
), the
OverPower counter starts. Both reference voltages depend on the measured input
voltage. In this way the system allows 150 % overpower over the rated power on a
cycle-by-cycle base. 100 % overpower triggers the overpower counter of 200 ms. Figure 9
shows the overpower protection curves.
Table 3. Protections
Protection Delay Action V
CC
regulated
AUX open no wait until AUX is
connected
no
brownout 30 ms wait until
V
mains
>V
brownin
yes
maximum on-time no safe restart 800 ms yes
OTP internal no latch yes
OTP via the PROTECT
pin
2 ms to 4 ms latch yes
OVP via the AUX pin 4 driver pulses
[1]
latch yes
overpower
compensation
no via AUX;
cycle-by-cycle
-
overpower time-out 40 ms or 200 ms safe restart 800 ms yes
overpower + UVLO no safe restart 800 ms yes
overcurrent protection blanking time cycle-by-cycle no
UVLO no Wait until V
CC
>V
startup
yes
TEA18361T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 2 — 12 December 2013 11 of 29
NXP Semiconductors
TEA18361T
GreenChip SMPS control IC
During system start-up, the maximum overpower is limited to 100 % and the maximum
time-out period is lowered to 40 ms. Once the output voltage is within its regulation level
(voltage on the CTRL pin is below 5 V), the maximum overpower is switched to 150 %
and the maximum time-out period returns to 200 ms limiting the output power to a
minimum at a shorted output. Lowering the maximum output power and shortening the
overpower timer ensure that the input power of the system is limited to < 5 W at a shorted
output.
Due to the limited output power, the output voltage drops if the load requires more than
150 %. As a result, the V
CC
voltage drops as well and UVLO can be triggered. To retain
the same response in an overpower situation (whether UVLO is triggered or not) the
system enters the protection mode (latch or safe restart) when overpower + UVLO is
detected. The system entering the protection mode does not depend on the value of the
OP counter.
7.6.2 OverVoltage Protection (OVP)
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 OVP level can be adjusted by the external resistor divider ratio
R
AUX2
/(R
AUX1
+R
AUX2
).
An internal counter of 4 gate pulses prevents false OVP detection which can occur during
ESD or lightning events.
7.6.3 Protection input (PROTECT pin)
The PROTECT pin is a general purpose input pin. It can be used to switch off the
converter (latched protection). The converter is stopped when the voltage on this pin is
pulled below V
det(PROTECT)
(0.5 V).
The PROTECT pin can be used to create an OTP function by connecting a Negative
Temperature Coefficient (NTC) resistor to this pin. A voltage on the PROTECT pin lower
than 0.5 V detects overtemperature. The PROTECT current (maximum 74 A) flowing
through the external NTC resistor creates the voltage. The PROTECT voltage is clamped
Fig 9. Overpower protection curves
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TEA18361T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
Product data sheet Rev. 2 — 12 December 2013 12 of 29
NXP Semiconductors
TEA18361T
GreenChip SMPS control IC
to maximum 1.45 V. At room temperature the resistance value of the NTC resistor is much
higher than at high temperature. Due to the clamp, the current out of the PROTECT pin is
1.45 V divided by the resistance, which is significantly lower than 74 A.
A filter capacitor can be connected to this pin.
To avoid false triggering, an internal filter of 2 ms to 4 ms is applied.
The PROTECT pin can also be a power-down mode pin (see Section 7.10
).
7.6.4 OverTemperature Protection (OTP)
Integrated OTP ensures that the IC stops switching if the junction temperature exceeds
the thermal temperature shutdown limit. OTP is a latched protection.
7.6.5 Maximum on-time
The controller limits the on-time of the external MOSFET to 55 s. When the on-time is
longer, the IC stops switching and enters safe restart mode.
7.6.6 Safe restart
If a protection is triggered and the system enters the safe restart mode, the system
restarts after 800 ms. Because the system is not switching, the VCC pin is supplied from
the mains via the HV pin.
After the 800 ms, 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. Once 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.
7.6.7 Latched protection
If a protection is triggered and the system enters the latched protection mode, the V
CC
is
continuously regulated to the V
startup
level via the HV current source. As long as the AC
voltage remains, the system does not switch.
Removing the mains for a short time is the only possibility to restart the system.
7.6.8 Fast latch reset
Fast latch reset is a simple and fast method to reset the system when it is in latched
protection mode or safe restart mode. This function is used during production testing.
When the latched protection mode or safe restart mode is triggered, the voltage on pin
VCC is fast discharged by an internal current source (I
CC(dch)
); see Figure 10). The fast
discharge avoids an additional waiting period if the VCC voltage is high. When shorting
the mains, the waiting period is only the time of the discharge from V
startup
to V
rst
.
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TEA18361T/1J

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Manufacturer:
NXP Semiconductors
Description:
Switching Controllers GreenChip SMPS contr control IC
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