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LT8685SRVPBF 数据表(PDF) 21 Page - Analog Devices |
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LT8685SRVPBF 数据表(HTML) 21 Page - Analog Devices |
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21 / 24 page  LT8685S 21 Rev. 0 For more information www.analog.com TYPICAL APPLICATIONS 42V Input, Quad Output 2MHz Step-Down Regulator with Spread Spectrum and Ratiometric Output Start-Up (Details of Front Page Application) Startup Sequence 4.7µF 4.7µF 4.7µF 2.2µF 0.1µF 0.1µF 1M 47µF 191k 3.3pF 0.1µF 0.40µH 1M 100µF 634k 3.3pF 0.1µF 0.30µH 665k 100µF 931k 10pF 26.1k 22.6k 0.1µF 1.2µH** 976k 47µF 309k 3.3pF 1.5µH** 10nF 10nF BST3 SW3 FB3 BST4 SW4 FB4 BIAS BST1 SW1 FB1 BST2 SW2 FB2 EN/UVLO EN2 VIN1 VIN2 EN3 EN4 VIN3 VIN4 6V TO 42V PG4 PG3 PG2 PG1 TRK/SS4 TRK/SS3 TRK/SS2 TRK/SS1 RT SYNC/MODE OUT1 5V, 2.5A* INTVCC OUT4 1.2V, 4A VIN OUT3 1.8V, 4A GND OUT2 3.3V, 2.5A LT8685S OUT1 *CURRENT AVAILABLE FROM OUT1: **INDUCTOR VALUES CHOSEN FOR VIN = 12V 2.5A – IVIN3 – IVIN4 – IBIAS 8685S TA02a STARTUP SEQUENCE: VIN HIGH ENABLES HV CHANNELS HV CHANNELS TRACK RATIOMETRICALLY VOUT1 HIGH ENABLES LV CHANNELS LV CHANNELS TRACK RATIOMETRICALLY 1ms/DIV VIN 10V/DIV VOUT1 2V/DIV VOUT2 2V/DIV VOUT3 1V/DIV VOUT4 1V/DIV 8685S TA02b |
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