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LTC3854EMSE 数据表(PDF) 22 Page - Linear Technology |
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LTC3854EMSE 数据表(HTML) 22 Page - Linear Technology |
22 / 28 page LTC3854 3854fa Choosing an RJK0330DPB for the bottom FET will pro- vide: BVDSS = 30V RDS(ON) = 3.9mΩ maximum at 25°C, VGS = 4.5V QG = 27nC, typical, at VGS = 4.5V PSYNC = 20V − 1.2V 20V • 15A ( )2 • 1 + 0.005 • 100°C – 25°C ( ) ( )•3.9mΩ PSYNC =1.1W Assumingathermalresistanceof40°C/Wforthemainand synchronous FETs, the resulting junction temperatures at an ambient of 60°C will be 82°C and 104°C, respectively. applicaTions inForMaTion Figure 6. 1.2V/15A Converter from Design Example Some airflow may be required for higher ambient tem- peratures. A maximum MOSFET junction temperature of 110°C at worst case ambient generally provides adequate margin. Given a typical QG of 8nC for the RJK0305DPB and 27nC for the RJK0330DPB and the 400kHz switching frequency, the current supplied by INTVCC will be: IGATECHG = (8nC + 27nC) • 400kHz = 14mA The resulting controller temperature at 60°C and a 20V input will be: TJ = 60°C + 20V • 14mA • 76°C/W = 81°C which is well under the maximum junction temperature of 125°C. 3854 F06 LTC3854 0.1µF 0.1µF 180µF 25V 4.7µF D1 100pF 2200pF L 0.56µH 1.8m DCR 3.09k 0.1µF COUT1 330µF 2 VOUT 1.2V 15A VIN 4.5V TO 28V 4.99k 10k 3.9k VIN TG BOOST SW INTVCC BG GND RUN/SS ITH FB SENSE– SENSE+ M1 M2 COUT2 47µF 10µF 25V 2 D1 = CMDSH-3 M1 = RENESAS RJK0305DPB M2 = RENESAS RJK0330DPB L = VISHAY IHLP4040DZ-01 0.56µH COUT1 = SANYO 2R5TPE330M9 COUT2 = MURATA GRM31CR60J476K + |
类似零件编号 - LTC3854EMSE |
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类似说明 - LTC3854EMSE |
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