数据搜索系统,热门电子元器件搜索 |
|
LTC3831EGN-1 数据表(PDF) 7 Page - Linear Technology |
|
LTC3831EGN-1 数据表(HTML) 7 Page - Linear Technology |
7 / 20 page 7 LTC3831-1 38311f PI FU CTIO S BLOCK DIAGRA transient response. 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 300kHz. 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 LTC3831-1 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): 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 4.7 µF 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. It remains low when TG is high or during shutdown mode. To prevent output under- shoot 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 2.66k 2.66k VREF + 10% 38311 BD Q 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 12 µA DISABLE ILIM IMAX IFB VREF GND VCC R S ENABLE BG Q POR FFBG – + PVCC1 VCC + 2V V |
类似零件编号 - LTC3831EGN-1 |
|
类似说明 - LTC3831EGN-1 |
|
|
链接网址 |
隐私政策 |
ALLDATASHEETCN.COM |
ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |