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BD95513MUV Datasheet(PDF) 10 Page - Rohm |
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BD95513MUV Datasheet(HTML) 10 Page - Rohm |
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10 / 18 page  Technical Note BD95513MUV 10/17 www.rohm.com 2010.10- Rev.A © 2010 ROHM Co., Ltd. All rights reserved. ● Operation The BD95513MUV is a switching regulator incorporating ROHM’s proprietary H 3RegTM CONTROLLA control system. When VOUT drops suddenly due to changes in load, the system quickly restores the output voltage by extending the ton time interval. This improves the regulator’s transient response. When light-load mode is activated, the IC employs the Simple Light Load Mode (SLLM TM) controller, further improving system efficiency. H 3RegTM Control (Normal Operation) (Rapid Changes in Load) Light Load Control (SLLM TM Mode) (QLLM Mode) VFB VREF HG LG High gate output is determined by the above formula. When VFB falls below the reference voltage (0.7V), the H 3RegTM CONTROLLA is activated; VFB VREF HG Io LG tON+α When VOUT drops due to a sudden change in load and the voltage remains below VREF after the preprogrammed tON time interval has elapsed, the system quickly restores VOUT by extending the tON time, thereby improving transient response. tON = VREF VIN × 1 f [sec]・・・(1) SLLM TM mode is enabled by setting the MODE pin to logic high. When the low gate is off and the current through the inductor is 0 (current flowing from VOUT to SW), the SLLM TM function is activated, disabling high gate output. If VFB falls below VREF again, the high gate is switched back on, lowering the switching frequency of the regulator and yielding higher efficiency when powering light loads. VFB VREF HG LG 0A QLLM mode is enabled by setting the MODE pin to HiZ or middle voltage. When the lower gate is off and the current through the inductor is 0 (current flowing from VOUT to SW), QLLM mode is activated, disabling high gate output. If VFB falls below VREF within a programmed time interval (typ. 40 µs), the high gate is switched on, but if VFB does not fall below VREF, the lower gate is forced on, dropping VFB and switching the high gate back on. The minimum switching frequency is set to 25 kHz (T = 40 µs), which keeps the regulator’s frequency from entering the audible spectrum but yields less efficient results than SLLM TM mode. VFB VREF HG LG 0A |
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