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LTC1629-6 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1629-6 Datasheet(HTML) 7 Page - Linear Technology |
7 / 28 page 7 LTC1629-6 16296f RUN/SS (Pin 1): Combination of Soft-Start, Run Control Input and Short-Circuit Detection Timer. A capacitor to ground at this pin sets the ramp time to full current output. Forcing this pin below 0.8V causes the IC to shut down all internal circuitry. All functions are disabled in shutdown. SENSE1+, SENSE2+ (Pins 2,14): The (+) Input to the Differential Current Comparators. The ITH pin voltage and built-in offsets between SENSE– and SENSE+ pins in conjunction with RSENSE set the current trip threshold. SENSE1–, SENSE2– (Pins 3, 13): The (–) Input to the Differential Current Comparators. EAIN (Pin 4): Input to the Error Amplifier that compares the feedback voltage to the internal 0.6V reference voltage. This pin is normally connected to a resistive divider from the output of the differential amplifier (DIFFOUT). PLLFLTR (Pin 5): The Phase-Locked Loop’s Low Pass Filter is tied to this pin. Alternatively, this pin can be driven with an AC or DC voltage source to vary the frequency of the internal oscillator. PI FU CTIO S Current Sense Pin Input Current vs Temperature EXTVCC Switch Resistance vs Temperature Oscillator Frequency vs Temperature Undervoltage Lockout vs Temperature Shutdown Latch Thresholds vs Temperature TYPICAL PERFOR A CE CHARACTERISTICS TEMPERATURE ( °C) –50 –25 0 0.5 1.5 2.0 2.5 75 100 50 4.5 1629 G27 1.0 0 25 125 3.0 3.5 4.0 LATCH ARMING LATCHOFF THRESHOLD TEMPERATURE ( °C) –50 3.40 3.45 3.50 25 75 1629 G26 3.35 3.30 –25 0 50 100 125 3.25 3.20 TEMPERATURE ( °C) –50 200 250 350 25 75 1629 G25 150 100 –25 0 50 100 125 50 0 300 VPLLFLTR = 2.4V VPLLFLTR = 0V TEMPERATURE ( °C) –50 –25 0 4 10 0 50 75 1629 G24 2 8 6 25 100 125 TEMPERATURE ( °C) –50 –25 25 29 35 0 50 75 1629 G23 27 33 31 25 100 125 VOUT = 5V |
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