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MAX797C/D датащи(PDF) 26 Page - Maxim Integrated Products |
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MAX797C/D датащи(HTML) 26 Page - Maxim Integrated Products |
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26 / 32 page ![]() Step-Down Controllers with Synchronous Rectifier for CPU Power 26 ______________________________________________________________________________________ MAX796 CSL CSH SECFB GND REF FB SYNC V+ VL 10 2 11 43 5 14 Q1 T1 = TDK 1:1.5 TRANSFORMER PC40EEM 12.7/13.7 - A160 CORE BEM 12.7/13.7 BOBBIN PRIMARY = 8 TURNS 24 AWG SECONDARY = 12 TURNS 24 AWG DESIGN FOR TIGHT MAGNETIC COUPLING Q1-Q2 = Si9410 or EQUIVALENT Q3 = Si9955 or EQUIVALENT (50V) Q2 Q3 16 15 13 1N4148 1N5819 MBR0502L 1N5817 12 8 9 7 VIN (8V TO 18V AS SHOWN) +5V AT 500mA +3.3V AT 2A BST DH LX DL 6 ON/OFF 1 PGND SHDN SS 0.33 μF 4.7 μF 47 μF 330 μF 0.1 μF 33 μF, 35V 10 μH 25m Ω T1 1:1.5 100k, 1% 102k 1% 49.9k 1% 33.2k 1% 102k, 1% 0.01 μF (OPTIONAL) Figure 12. +3.3V/+5V Dual-Output Application (MAX796) MAX799 CSL CSH VL SS GND REF SECFB 10 32 11 1 4 14 1/2 Si9936 1/2 Si9936 EQ11FS1 T1 = TRANSPOWER TTI5926 16 15 13 1N4148 1N5819 12 8 9 FB 7 VIN (9V TO 18V) -5.5V OUT (-5.5V AT 200mA) +5V OUT (+5V AT 1A) BST V+ DH LX DL 6 5 ON/OFF PGND SHDN SYNC 0.01 μF (OPTIONAL) 220 μF 10V 0.1 μF 22 μF, 35V 1 μF 22 μF 10V 50m Ω T1 15 μH 1:1.3 221k, 1% 1000pF 107k, 1% 4.7 μF Figure 13. ±5V Dual-Output Application (MAX799) ____________________________________________Application Circuits (continued) |
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