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LM3101 Fiches technique(PDF) 7 Page - National Semiconductor (TI) |
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LM3101 Fiches technique(HTML) 7 Page - National Semiconductor (TI) |
7 / 20 page Pin-by-Pin Description (Continued) Pin Symbol Function Description 11 POR Power-On This open-collector output is driven low when either the supply voltage falls below the Reset Flag Undervoltage Lockout Threshold Voltage or the output voltage is less than the Power- on Reset Threshold Voltage Leave the pin open if not used 12 CRD Reset Delay Capacitor Adding a capacitor between this pin and ground sets the power-on reset flag delay time according to the following formula CRD e TDR 60 103 F s X Leave the pin open if not used The POR flag will still operate if this function is not used 13 FB Feedback Input A sample of the output voltage via a resistor divider is fed back into this pin which is the inverting input of the error amplifier 14 EAO Error Amplifier Output Error Amplifier Output The output can source 15 mA typically and sink 300 mA typically This pin is primarily used for loop compensation Note Pins 1 2 4 5 and 10 are internally clamped by a 56V zener diode Do not force a voltage larger than 5V on these pins without a resistor to limit the current to below 1 mA All other pins are limited to the supply voltage Test Circuit LM3101 specifications are measured using automated test equipment This circuit is provided for the custom- er’s convenience when checking parameters Due to possible variations in testing conditions the measured values from these testing procedures may not match those of the factory TLH11436 – 5 This test circuit is for exercising the LM3101 functions and measuring its specifications With the switch positions shown the supply current should measure 15 mA (typical) for a supply voltage of 15V Changing the supply voltage to 5V and opening SW6 on the VOUT pin should make the supply current 11 mA (typical) Changing SW7 to the supply voltage will shutdown the LM3101 output To test the oscillator section adjust the 5 kX potentiometer at the RT pin such that the oscillator frequency is approxi- mately 500 kHz Switch SW2 to obtain a 1 MHz frequency (typical) The maximum duty cycle of 92% typically can also be measured Closing SW3 on pin RSC and putting SW7 (pin FB) in the open position will change the oscillator frequency to approximately 180 kHz Switching the MC pin SW1 to ground and opening SW4 the CMI pin will put the device in current mode control To measure the current sense time delay (typically 75 ns) close SW5 (connected to the CMI pin) and open SW6 7 |
Numéro de pièce similaire - LM3101 |
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Description similaire - LM3101 |
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