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TEA1762T Datasheet(PDF) 5 Page - NXP Semiconductors |
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TEA1762T Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 15 page TEA1762T_2 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 02 — 25 April 2007 5 of 15 NXP Semiconductors TEA1762T GreenChip synchronous rectifier controller 7.3 SMPS output voltage and current regulation The output voltage of the flyback Switched Mode Power Supply (SMPS) can be controlled by sensing the output voltage via the VSENSE pin. The feedback loop via the primary controller can regulate the output voltage of the switched mode power supply by regulating the voltage on the VSENSE pin to 2.5 V above the voltage on pin SENSEGND. Also the output current of the flyback SMPS can be controlled or limited. The voltage on the ISENSE pin is regulated or limited to 50 mV above the voltage on pin POWERGND. 7.4 Opto outputs The opto output is intended to drive an opto coupler (see Figure 5). The opto outputs have an open drain output configuration. The maximum sink current is internally limited to 5 mA (typical). The outputs are linearly controlled via the VSENSE and ISENSE input pins. An over-temperature situation will switch the protection opto output (OPTOPROT) to its maximum sink current. During start-up (VCC <Vstartup) and undervoltage lock-out the outputs are disabled. 7.5 Protection input The PROTECT pin is a general purpose input pin which can be used for additional protection of the switched mode power supply. With a Negative Temperature Coefficient (NTC) thermistor external temperature protection can be provided, e.g. the external power switches and transformer can be protected against high temperatures. With a Zener diode a secondary overvoltage protection can be made. 7.6 Reference voltage output The reference voltage output pin can be used for supplying external circuitry. The maximum output current must be limited to 1 mA. The reference voltage is activated as soon as the start-up voltage is reached on the VCC pin and switched off again after the VCC pin voltage drops below the VCC stop level. 7.7 Supply management All (internal) reference voltages are derived from a temperature compensated, on-chip band gap circuit. The reference voltage is trimmed to an accuracy within 1 %. 7.8 OverTemperature Protection (OTP) The IC provides an accurate internal overtemperature protection of 150 °C (typical). The IC will maximize the current of pin OPTOPROT as soon as the internal temperature limit is reached. The opto signal can be used on the primary side of the flyback controller to activate the SMPS protection or limit the output power. As soon as the overtemperature condition is solved, normal operation will resume. |
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