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BU90005GWZ датащи(PDF) 10 Page - Rohm |
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BU90005GWZ датащи(HTML) 10 Page - Rohm |
10 / 14 page Technical Note 10/14 BU90002GWZ, BU90003GWZ, BU90004GWZ, BU90005GWZ, BU90006GWZ www.rohm.com Target spec. ver.1.7 © 2011 ROHM Co., Ltd. All rights reserved. ●Functional descriptions The BU9000XGWZ are a synchronous step-down DC/DC converter that achieves fast transient response from light load to heavy load by hysteretic PWM control system and current constant PFM control system. ○PWM control BU9000XGWZ operates by hysteretic PWM control. This scheme ensures fast switching, high efficiency, and fast transient response. When the output voltage is below the VREF voltage, the error comparator output is low to high and turning on P-channel MOSFET until above the VREF voltage and minimum on time. ○PFM control At light load the regulator and MODE=low, the regulator operates with reduced switching frequency and improves the efficiency. During PFM operation, the output voltage slightly higher than typical output voltage. Fig. Operation of PFM mode and PWM mode PFM (constant current)Threshold. turn off Pch FET output PWM mode voltage PFM Mode at Light Load PFM Threshold. turn on PFET PWM Mode at Moderate to Heavy Loads |
Аналогичный номер детали - BU90005GWZ |
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Аналогичное описание - BU90005GWZ |
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