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LTC3862EFE-TRPBF Datasheet(PDF) 10 Page - Linear Technology |
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LTC3862EFE-TRPBF Datasheet(HTML) 10 Page - Linear Technology |
10 / 40 page LTC3862 10 3862fb PIN FUNCTIONS SENSE1+, SENSE2+: Positive Inputs to the Current Comparators. The ITH pin voltage programs the current comparator offset in order to set the peak current trip threshold. This pin is normally connected to a sense resistor in the source of the power MOSFET. SENSE1–, SENSE2–: Negative Inputs to the Current Com- parators. This pin is normally connected to the bottom of the sense resistor. SGND: Signal Ground. All feedback and soft-start con- nections should return to SGND. For optimum load regulation, the SGND pin should be kelvin connected to the PCB location between the negative terminals of the output capacitors. SLOPE: This pin programs the gain of the internal slope compensation. Floating this pin provides a normalized slope compensation gain of 1.00. Connecting this pin to 3V8 increases the normalized slope compensation by 66%, and connecting it to SGND decreases the normalized slope compensation by 37.5%. See Applications Informa- tion for more details. SS: Soft-Start Input. For soft-start operation, connecting a capacitor from this pin to SGND will clamp the output of the error amp. An internal 5μA current source will charge the capacitor and set the rate of increase of the peak switch current of the converter. SYNC: PLL Synchronization Input. Applying an external clock between 50kHz and 650kHz will cause the operating frequency to synchronize to the clock. SYNC is pulled down by a 50k internal resistor. The rising edge of the SYNC input waveform will align with the rising edge of GATE1 in closed-loop operation. VIN: Main Supply Input. A low ESR ceramic capacitor should be connected between this pin and SGND. |
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