 |
전자부품 데이터시트 검색엔진 |
|
|
전자부품 데이터시트 검색엔진 |
|
RT8231A 데이터시트(PDF) 5 Page - Richtek Technology Corporation |
|
|
|||||||||||||||||||||||||||||
RT8231A 데이터시트(HTML) 5 Page - Richtek Technology Corporation |
|
|
5 / 23 page  RT8231A/B 5 DS8231A/B-11 April 2021 www.richtek.com © Copyright 2021 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Operation The RT8231A/B is a constant on-time synchronous step- down controller. In normal operation, the high-side N-MOSFET is turned on when the output voltage is lower than VREF, and is turned off after the internal one-shot timer expires. While the high-side N-MOSFET is turned off, the low-side N-MOSFET is turned on to conduct the inductor current until next cycle begins. Soft-Start (SS) For internal soft-start function, an internal current source charges an internal capacitor to build the soft-start ramp voltage. The output voltage will track the internal ramp voltage during soft-start interval. PGOOD The power good output is an open-drain architecture. When the soft-start is finished, the PGOOD open-drain output will be high impedance. Current Limit The current limit circuit employs a unique “valley” current sensing algorithm. If the magnitude of the current sense signal at PHASE is above the current limit threshold, the PWM is not allowed to initiate a new cycle. The current limit threshold can be set with an external voltage setting resistor on the CS pin. Over-Voltage Protection (OVP) & Under-Voltage Protection (UVP) The output voltage is continuously monitored for over- voltage and under-voltage protection. When the output voltage exceeds its set voltage threshold( 115% of VOUT), UGATE goes low and LGATE is forced high. When the feedback voltage is less than 0.45V, under-voltage protection is triggered and then both UGATE and LGATE gate drivers are forced low. The controller is latched until VDD is re-supplied and exceeds the POR rising threshold voltage or S5 is reset. VTT Linear Regulator and VTTREF This VTT linear regulator employs ultimate fast response feedback loop so that small ceramic capacitors are enough for keeping track of VTTREF within 40mV at all conditions, including fast load transient. The VTTREF block consists of on-chip 1/2 divider, LPF and buffer. This regulator also has sink and source capability up to 10mA. Bypass VTTREF to GND with a 33nF ceramic capacitor for stable operation. |
유사한 부품 번호 - RT8231A |
|
유사한 설명 - RT8231A |
|
|
|
링크 URL |
| 개인정보취급방침 |
| ALLDATASHEET.CO.KR |
| ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크교환 | 제조사별 검색 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 |
Korean ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
