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LTC3831 Datasheet(PDF) 7 Page - Linear Technology |
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LTC3831 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 20 page  LTC3831 7 3831fb PIN FUNCTIONS BLOCK DIAGRAM FREQSET (Pin 11): Frequency Set. Use this pin to adjust the free-running frequency of the internal oscillator. With the pin floating, the oscillator runs at about 200kHz. A resistor from FREQSET to ground speeds up the oscillator; a resistor to VCC slows it down. IMAX (Pin 12): Current Limit Threshold Set. IMAX sets the threshold for the internal current limit comparator. If IFB drops below IMAX with TG on, the LTC3831 goes into cur- rent limit. IMAX has an internal 12μA pull-down to GND. Connect this pin to the main VIN supply at the drain of Q1, through an external resistor to set the current limit threshold. Connect a 0.1μF decoupling capacitor across this resistor to filter switching noise. IFB (Pin 13): Current Limit Sense. Connect this pin to the switching node at the source of Q1 and the drain of Q2 through a 1k resistor. The 1k resistor is required to prevent voltage transients from damaging IFB.This pin is used for sensing the voltage drop across the upper N-channel MOSFET, Q1. VCC (Pin 14): Power Supply Input. All low power internal circuits draw their supply from this pin. This pin requires a 4.7μF bypass capacitor to GND. PVCC2 (Pin 15): Power Supply Input for BG. Connect this pin to the main high power supply. BG (Pin 16): Bottom Driver Output . Connect this pin to the gate of the lower N-channel MOSFET, Q2. This output swings from PGND to PVCC2.ItremainslowwhenTGishigh or during shutdown mode. To prevent output undershoot during a soft-start cycle, BG is held low until TG first goes high (FFBG in the Block Diagram). 2.2V QC 1.2V – + – + – + R S PVCC1 TG PVCC2 BG PGND R+ R– FB 24k 24k 750Ω 750Ω VREF + 3% 3830 BD Q Q PWM QSS VREF VREF – 3% VREF + 3% MAX MIN ERR 12μA INTERNAL OSCILLATOR 100μs DELAY SHDN FREQSET COMP SS POWER DOWN DISABLE GATE DRIVE LOGIC AND THERMAL SHUTDOWN + – CC 12μA DISABLE ILIM IMAX IFB VREF VREF – 3% GND VCC R S ENABLE BG Q POR FFBG – + PVCC1 VCC1 + 2.5V V |
Similar Part No. - LTC3831_15 |
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Similar Description - LTC3831_15 |
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