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BD9123MUV Datasheet(PDF) 6 Page - Rohm |
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BD9123MUV Datasheet(HTML) 6 Page - Rohm |
6 / 18 page Technical Note 6/17 www.rohm.com 2011.01 - Rev.A © 2011 ROHM Co., Ltd. All rights reserved. BD9123MUV ● Information on advantages Advantage 1: Offers fast transient response with current mode control system. Fig.22 Comparison of transient response Advantage 2: Offers high efficiency for all load range. ・ For lighter load: Utilizes the current mode control mode called SLLM for lighter load, which reduces various dissipation such as switching dissipation (PSW), gate charge/discharge dissipation, ESR dissipation of output capacitor (PESR) and on-resistance dissipation (PRON) that may otherwise cause degradation in efficiency for lighter load. Achieves efficiency improvement for lighter load. ・ For heavier load: Utilizes the synchronous rectifying mode and the low on-resistance MOS FETs incorporated as power transistor. ON resistance of Pch side MOS FET : 0.35mΩ(Typ.) ON resistance of Nch side MOS FET : 0.25mΩ(Typ.) Achieves efficiency improvement for heavier load. Offers high efficiency for all load range with the improvements mentioned above. Advantage 3: ・ Supplied in smaller package due to small-sized power MOS FET incorporated. ・ Output capacitor Co required for current mode control: 10µF ceramic capacitor ・ Inductance L required for the operating frequency of 1 MHz: 4.7µH inductor Reduces a mounting area required. Fig.24 Example application Conventional product (Load response IO=0.1A→0.6A) BD9123MUV (Load response IO=0.6A→0.1A) DC/DC Convertor RITH L Co VOUT CITH VCC Cin VCC R PGOOD 15mm 20mm CITH Co RITH CIN L RPGOOD Cf Rf 0.001 0.01 0.1 1 0 50 100 ① ② PWM SLLM ① inprovement by SLLM system ② improvement by synchronous rectifier Fig.23 Efficiency Output current Io[A] VOUT 27mV VOUT 37mV IOUT IOUT |
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