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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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L7981 数据表(PDF) 6 Page - STMicroelectronics |
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L7981 数据表(HTML) 6 Page - STMicroelectronics |
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6 / 44 page  Electrical characteristics L7981 6/44 Doc ID 15182 Rev 3 4 Electrical characteristics TJ=25 °C, VCC=12 V, unless otherwise specified. Table 4. Electrical characteristics Symbol Parameter Test condition Values Unit Min Typ Max VCC Operating input voltage range (1) 4.5 28 V VCCON Turn on VCC threshold (1) 4.4 VCCHYS VCC UVLO Hysteresis (1) 0.12 0.35 RDSON Mosfet on resistance 160 180 m Ω (1) 160 250 ILIM Maximum limiting current 3.7 4.2 4.7 A Oscillator FSW Switching frequency 225 250 275 KHz (1) 220 275 VFSW FSW pin voltage 1.254 V D Duty Cycle 0 100 % FADJ Adjustable switching frequency RFSW=33kΩ 1000 KHz Dynamic characteristics VFB Feedback voltage 4.5V<VCC<28V (1) 0.593 0.6 0.607 V DC characteristics IQ Quiescent current Duty Cycle=0, VFB=0.8V 2.4 mA IQST-BY Total stand-by quiescent current 20 30 μA Enable EN threshold voltage Device OFF level 0.3 V Device ON level 1.2 EN current EN=VCC 7.5 10 μA Soft-start TSS Soft-start duration FSW pin floating 7.4 8.2 9.1 ms FSW=1MHz, RFSW=33kΩ 2 Error amplifier |
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