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TEA18362LT 数据表(PDF) 11 Page - NXP Semiconductors

部件名 TEA18362LT
功能描述  GreenChip SMPS control IC
Download  29 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

TEA18362LT 数据表(HTML) 11 Page - NXP Semiconductors

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TEA18362LT
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
TEA18362LT
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 VCC 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
RAUX2 /(RAUX1 +RAUX2).
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 Vdet(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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