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LM3101M Arkusz danych(PDF) 6 Page - National Semiconductor (TI) |
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LM3101M Arkusz danych(HTML) 6 Page - National Semiconductor (TI) |
6 / 20 page Typical Performance Characteristics (Continued) Step Response Error Amplifier Frequency Response Open Loop Error Amplifier TLH11436 – 4 Pin-by-Pin Description Pin Symbol Function Description 1RT Frequency Setting Connecting a resistor RT between this pin and ground programs the frequency Resistor from 50 kHz to 1 MHzby the following equation RT e 025(FO 20 10b12) F Hz X RT also sets the internal bias current which affects the operation of several sub- circuits within the IC 2 MC Mode Control For voltage mode operation connect a resistor RMC from this pin to the supply voltage For current mode operation this pin is tied to ground via resistor RMC A current is sourced from the pin through the resistor such that it sets the slope of the compensating ramp ICOMP according to the equation D ICOMP DT e 24 103 (RT RMC) m A ms X 3 SFST Soft-Start Control A series resistor-capacitor network tied from this pin to ground provides Soft-Start capability The current charging the capacitor is ISFST e 045RT A V X Leave this pin open if it is not used 4 SYNC Synchronization An external negative pulse fed to this input will synchronize the internal oscillator Signal Input The frequency range of the external signal should be between 11 to 15 times the free-running frequency Connect this pin to ground if it is not used 5RSC Short Circuit Frequency A resistor RSC connected from this pin to the regulator output determines the Shift Control oscillator frequency during a short circuit by the formula RSC e 009 (0267RT)-FSC 20 b12 F Hz X or alternately FSC e (120 10b12) (0267RT) - (009RSC) F Hz X The recommended minimum ratio of short circuit frequency to oscillator frequency is one-third (nominal) 6 CMI Current Mode Input An analog voltage signal proportional to the transformer primary current fed to this input results in current mode operation Connect this pin directly to ground if selecting voltage mode operation 7 GND Ground Ground 8VOUT Output Output pin It produces a PWM pulse train that is fed back to the primary side of the regulator via a pulse transformer 9VS Supply Voltage Supply voltage 10 CD Crowbar Output This pin delivers a current when an overvoltage condition occurs on the output It can Driver be used to fire an external SCR to crowbar the output Leave the pin open if not used 6 |
Podobny numer części - LM3101M |
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Podobny opis - LM3101M |
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