전자부품 데이터시트 검색엔진 |
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RT5047B 데이터시트(PDF) 3 Page - Richtek Technology Corporation |
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RT5047B 데이터시트(HTML) 3 Page - Richtek Technology Corporation |
3 / 17 page RT5047B Copyright © 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS5047B-00 November 2017 www.richtek.com 3 Operation The RT5047B integrates a current mode boost converter and linear regulator. Use the SEL pin to control the LNB voltage and the boost converter track is at least greater 850mV than LNB voltage. The boost converter is the high efficiency PWM architecture with 700kHz operation frequency. The linear regulator has the capability to source current up to 550mA during continuous operation. All the loop compensation, current sensing, and slope compensation functions are provided internally. OCP Both the boost converter and the linear regulator have independent current limit. In the boost converter (OCP1), this is achieved through cycle-by-cycle internal current limit (typ. 3A). In the linear regulator (OCP2), when the linear regulator exceeds OCP more than 6ms, the LNB output will be disabled and re-start after 1.8s. Tone Circuit This circuit is used for tone generation. Use the TONE pin to control output amplitude of LNB. OTP When the junction temperature reaches the critical temperature (typically 150 C), the boost converter and the linear regulator are immediately disabled. UVLO The UVLO circuit compares the VIN with the UVLO threshold (7.7V rising typically) to ensure that the input voltage is high enough for reliable operation. The 350mV (typ.) hysteresis prevents supply transients from causing a shutdown. PWM Controller The loop compensation, current sensing, and slope compensation functions are provided internally. |
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