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LTC3805EDD Datasheet(PDF) 6 Page - Linear Technology |
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LTC3805EDD Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  LTC3805 6 3805fb PIN FUNCTIONS SSFLT (Pin 1): Soft-Start Pin. A capacitor placed from this pin to GND (Exposed Pad) controls the rate of rise of converter output voltage during start-up. This capacitor is also used for time out after a fault prior to restart. ITH (Pin 2): Error Amplifier Compensation Point. Normal operating voltage range is clamped between 0.7V and 1.9V. FB (Pin 3): Receives the feedback voltage from an external resistor divider across the output. RUN (Pin 4): An external resistor divider connects this pin to VIN and sets the thresholds for converter operation. FS (Pin 5): A resistor connected from this pin to ground sets the frequency of operation. SYNC (Pin 6): Input to synchronize the oscillator to an external source. ISENSE (Pin 7): Performs two functions: for current mode control, it monitors the switch current, using the voltage across an external current sense resistor. Pin 7 also injects a current ramp that develops slope compensation voltage across an optional external programming resistor. OC (Pin 8): Overcurrent Pin. Connect this pin to the ex- ternal switch current sense resistor. An additional resistor programs the overcurrent trip level. VCC (Pin 9): Supply Pin. A capacitor must closely decouple VCC to GND (Exposed Pad). GATE (Pin 10): Gate Drive for the External N-Channel MOSFET. This pin swings from GND to VCC. Exposed Pad (Pin 11): Ground. A capacitor must closely decouple GND to VCC (Pin 9). Must be soldered to electri- cal ground on PCB. |
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