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SG6742HL Datasheet(PDF) 6 Page - Fairchild Semiconductor |
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SG6742HL Datasheet(HTML) 6 Page - Fairchild Semiconductor |
6 / 8 page AN-6077 APPLICATION NOTE © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.2 • 12/1/08 6 Output Driver / Soft Driving The output stage is a fast totem-pole gate driver capable of directly driving an external MOSFET. An internal Zener diode clamps the driver voltage under 18V to protect the MOSFET against over-voltage. By integrating special circuits to control the slew rate of switch-on rising time, the external resistor RG may not be necessary to reduce switching noise, improving Electromagnetic Interference (EMI) performance. ON/OFF Driver V DD 18V SG6742 GATE RG Figure 13. Gate Driver Thermal Protection A constant current IRT (IRT = 100µA) is provided from the RT pin. For over-temperature protection, an NTC thermistor RT in series with a resistor Ra can be connected between the RT pin and ground. When VRT, the voltage level of the RT pin, is less than 1.05V; PWM output is latched off after a debounce time of tD-OTP1, which is added to prevent false triggering. If VRT is less than 0.7V, PWM output latches off after a very short debounce time of tD-OTP2. If the thermal protection is not used, connect a small capacitor (around 0.47nF is recommended) from the RT pin to the GND pin to prevent noise interference. This RT capacitor cannot be larger than 1nF or the thermal protection is triggered before a successful startup of output voltage. Over-Temperature Protection (OTP) The built-in temperature-sensing circuit shuts down PWM output once the junction temperature exceeds 135°C. While PWM output is shut down, VDD gradually drops to the UVLO voltage (around 7.5V). Then VDD charges up to the startup threshold voltage of 15.5V through the startup resistor until PWM output is restarted. This hiccup-mode protection occurs repeatedly as long as the temperature remains above 130°C. The temperature hysteresis window for the OTP circuit is 25°C. |
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