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LM5020 Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM5020 Datasheet(HTML) 3 Page - National Semiconductor (TI) |
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3 / 13 page  Pin Descriptions Pin Name Description Application Information 1 VIN Source Input Voltage Input to the start-up regulator. Input range is 13V to 100V. 2 FB Feedback Signal Inverting input of the internal error amplifier. The non-inverting input is internally connected to a 1.25V reference. 3 COMP The output of the error amplifier and input to the Pulse Width Modulator COMP pull-up is provided by an internal 5K resistor which may be used to bias an opto-coupler transistor. 4 VCC Output of the internal high voltage series pass regulator. Regulated output voltage is 7.7V If an auxiliary winding raises the voltage on this pin above the regulation set point, the internal series pass regulator will shut down, reducing the internal power dissipation. 5 OUT Output of the PWM controller Gate driver output with a 1A peak current capability. 6 GND Ground return 7 UVLO Line Under-Voltage Shutdown An external resistor divider from the power converter source voltage sets the shutdown levels. The threshold at this pin is 1.25V. Hysteresis is set by a switched internal 20µA current source. 8 CS Current Sense input Current sense input for current mode control and over-current protection. Current limiting is accomplished using a dedicated current sense comparator. If the CS pin voltage exceeds 0.5V the OUT pin switches low for cycle-by-cycle current limiting. CS is held low for 50ns after OUT switches high to blank leading edge current spikes. 9 RT / SYNC Oscillator timing resistor pin and synchronization input An external resistor connected from RT to GND sets the oscillator frequency. This pin also accepts synchronization pulses from an external clock. 10 SS Softstart Input An external capacitor and an internal 10µA current source set the soft-start ramp rate. www.national.com 3 |
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