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RT9553A Scheda tecnica(PDF) 9 Page - Richtek Technology Corporation |
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RT9553A Scheda tecnica(HTML) 9 Page - Richtek Technology Corporation |
9 / 12 page RT9553A 9 DS9553A-00 September 2014 www.richtek.com © Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. OVSET CSP R2 V3.3V R1 R2 R2 V3.3V 9 R1 R2 We suggest that the total resistance of divider network should be higher than 100k Ω. VCSP is over-voltage protection trigger point. Fighre1.Setting Network of Over-Voltage Protection and Under-Voltage Protection UVSET OVSET + - + - 1R 8R TIMER RTIMER R1 R2 R3 R4 3.3V 3.3V CSP VCSP Under-Voltage Protection (UVP) The principle of under-voltage protection is the same as over-voltage protection function. The under-voltage protection threshold is set by the UVSET pin. When the CSP pin voltage is lower the setting threshold at the UVSET pin, the under-voltage protection will be triggered, and the RESET pin will be pull low after a deglitch time, the RESET is resumed when the CSP pin voltage up to 8% hysteresis. Over-Current Protection (OCP) As an industry standard, high accuracy current sense amplifier is used to monitor the input current that flows through current sense resistor. The RT9553A detects CSP- CSN differential voltage across the current sense resistor to monitor input current. The equation of over-current protection is shown as below : ILIM SENSE SENSE ILIM ILIM SENSE SENSE R6 V3.3V R5 R6 (I R ) 20 V V I 20 R We suggest that the total resistance of divider network should be higher than 100k Ω. ISENSE is over-current protection trigger point. The 20 is amplification of internal error amplifier. Figure 2. Setting Network of Over-Current Protection CSN CSP ILIM 3.3V R5 R6 ISENSE RSENSE Application Information The RT9553A provides OVP, UVP, OCP protection functions with RESET, PROCHOT indicator to inform system. It can be operated minimize external components of switching power supply systems to achieve protection. For easily using and increasing PCB space utilization, the RT9553A is used in notebook applications. Over-Voltage Protection (OVP) The CSP pin voltage can be continuously monitored for over-voltage condition. When the CSP pin voltage exceeds the setting threshold at the OVSET pin, the over-voltage protection will be triggered, and the RESET pin will be pull low after a deglitch time, the RESET is resumed when the CSP pin voltage down to 8% hysteresis. For more details, please refer to the following information. The equation of over-voltage setting threshold is shown as below : |
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