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BD9150MUV-E2 Datasheet(PDF) 6 Page - Rohm |
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BD9150MUV-E2 Datasheet(HTML) 6 Page - Rohm |
6 / 17 page Technical Note 6/16 BD9150MUV www.rohm.com 2010.04 - Rev.C ○ c 2010 ROHM Co., Ltd. All rights reserved. ● Information on advantages Advantage 1:Offers fast transient response with current mode control system. Fig.24Transient 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 Highside MOS FET : 170mΩ(Typ.) ON resistance of Lowside MOS FET : 130mΩ(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. Reduces a mounting area required. Fig.26 Example application Fig.25 Efficiency BD9150MUV (Load response IO=0.5A→1.5A) BD9150MUV (Load response IO=1.5A→0.5A) ・ Output capacitor Co required for current mode control: 22μF ceramic capacitor ・ Inductance L required for the operating frequency of 1 MHz: 2.2μH inductor ・ Incorporates FET + Boot strap diode 0.001 0.01 0.1 1 0 50 100 ① ② PWM SLLM ① inprovement by SLLM system ② improvement by synchronous rectifier Output current Io[A] VOUT IOUT VOUT IOUT L1 VOUT1 ITH1 FB1 EN1 SW1 SW1 AGND PGND1 PVcc COUT1 CIN1 PGND1 RITH1 L2 FB2 EN2 SW2 SW2 N.C . AVcc ITH2 PVcc PVcc PGND2 VOUT2 R2 R1 CIN2 COUT2 PGND2 RITH2 CITH2 CITH 1 15mm 20mm CITH1 L1 R1 RITH1 CIN1 CIN2 COUT1 COUT2 L2 R2 CITH2 RITH2 |
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