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LTC3832 数据表(PDF) 7 Page - Linear Technology |
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LTC3832 数据表(HTML) 7 Page - Linear Technology |
7 / 24 page 7 LTC3832/LTC3832-1 sn3832 3832fs PI FU CTIO S FREQSET (Pin 11/NA): Frequency Set. Use this pin to adjust the free-running frequency of the internal oscillator. With the pin floating, the oscillator runs at about 300kHz. A resistor from FREQSET to ground speeds up the oscil- lator; a resistor to VCC slows it down. IMAX (Pin 12/NA): Current Limit Threshold Set. IMAX sets the threshold for the internal current limit comparator. If IFB drops below IMAX with G1 on, the LTC3832 goes into current 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 thresh- old. Connect a 0.1 µF decoupling capacitor across this resistor to filter switching noise. IFB (Pin 13/NA): 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/Pin 7): Power Supply Input. All low power internal circuits draw their supply from this pin. Connect this pin to a clean power supply, separate from the main VIN supply at the drain of Q1. This pin requires a 4.7µF bypass capacitor. The LTC3832-1has VCC and PVCC2 tied together at Pin 7 and requires a 10 µF bypass capacitor to GND. PVCC2 (Pin 15/Pin 7): Power Supply Input for G2. Connect this pin to the main high power supply. G2 (Pin 16/Pin 8): Bottom Gate Driver Output. Connect this pin to the gate of the lower N-channel MOSFET, Q2. This output swings from PGND to PVCC2. It remains low when G1 is high or during shutdown mode. To prevent output undershoot during a soft-start cycle, G2 is held low until G1 first goes high (FFBG in the Block Diagram). BLOCK DIAGRA – + – + R S PVCC1 G1 PVCC2 G2 PGND FB SENSE+ VREF VREF + 10% 18k 5.7k SENSE– 3832 BD BG Q Q R POR S FFBG ENABLE G2 Q PWM QSS VREF VREF + 10% MAX ERR 12 µA INTERNAL OSCILLATOR 100 µs DELAY SHDN FREQSET COMP SS POWER DOWN DISABLE GATE DRIVE LOGIC AND THERMAL SHUTDOWN + – CC 2.2V QC 1.2V PVCC1 VCC + 2.5V 12 µA DISABLE ILIM IMAX IFB VCC GND – + V (LTC3832) |
类似零件编号 - LTC3832 |
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类似说明 - LTC3832 |
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