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LTC3721EUF-1 Datasheet(PDF) 7 Page - Linear Integrated Systems |
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LTC3721EUF-1 Datasheet(HTML) 7 Page - Linear Integrated Systems |
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7 / 16 page  LTC3721-1 7 sn37211 37211fs FB (Pin 13/Pin 12): Error Amplifier Inverting Input. This is the voltage feedback input for the LTC3721-1. The nomi- nal regulation voltage at FB is 1.2V. SS (Pin 14/Pin 13): Soft-Start/Restart Delay Circuitry Timing Capacitor. A capacitor from SS to GND provides a controlled ramp of the current command. During overload conditions, SS is discharged to ground initiating a soft- start cycle. SS charging current is approximately 13µA. SS will charge up to approximately 5V in normal operation. During a constant overload current fault, SS will oscillate at a low frequency between approximately 0.5V and 4V. DESCRIPTIO S PI UVLO (Pin 15/Pin 14): Input to Program System Turn-On and Turn-Off Voltages. The nominal threshold of the UVLO comparator is 5.0V. UVLO is connected to the main DC system feed through a resistor divider. When the UVLO threshold is exceeded, the LTC3721-1 commences a soft- start cycle and a 10µA (nominal) current is fed out of UVLO to program the desired amount of system hysteresis. The hysteresis level can be adjusted by changing the resis- tance of the divider. UVLO can also be used to terminate all switching by pulling UVLO down to less than 4V. An open drain or collector switch can perform this function without changing the system turn on or turn off voltages. NC (Pin 2, Pin 3, Pin 16/Pin 7, Pin 16): Not Connected. (GN Package/UF Package) PROGRAMMABLE DEAD-TIME DRVA DRVB 37211 TD01 CURRENT SENSE OR CT RAMP PWM COMPARATOR (–) TI I G DIAGRA |
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