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TEA18362LT 数据表(PDF) 11 Page - NXP Semiconductors |
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TEA18362LT 数据表(HTML) 11 Page - NXP Semiconductors |
11 / 29 page 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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