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IR3551 Datasheet(PDF) 3 Page - International Rectifier |
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IR3551 Datasheet(HTML) 3 Page - International Rectifier |
3 / 22 page September 10, 2012 | FINAL DATASHEET 3 IR3551 50A Integrated PowIRstage® TYPICAL APPLICATION DIAGRAM (CONTINUED) SW PWM VIN PGND Gate Drivers and Current Sense Amplifier IOUT VCC PHSFLT# VCC BOOST VIN PWM REFIN PHSFLT# BBRK# BBRK# CS+ LGND CSIN- CSIN+ IR3551 4.5V to 7V 4.5V to 15V C2 10uF x 2 C5 0.22uF C3 0.1uF R1 10k C4 0.22uF R2 2.49k L1 150nH 3 16-19 20 21 22 23 24 26 25 1 2 14, 15 6-13 C1 0.1uF PGND 4 27 TGND No Connect CS- VOUT C7 470uF C6 22uF Figure 5: Application Circuit without Current Sense Amplifier FUNCTIONAL BLOCK DIAGRAM PHSFLT# PWM 6 7 8 9 10 11 12 13 16 17 18 19 VIN VIN VIN VIN SW SW SW SW SW SW SW SW 1 27 14 15 CSIN- PGND PGND TGND 20 BOOST Power-on Reset (POR), 3.3V Reference, and Dead-time Control 22 IOUT 26 VCC 3 BBRK# 23 5 28 GATEL GATEL Driver Driver 21 2 CSIN+ 24 LGND 25 REFIN Current Sense Amplifier MOSFET & Thermal Detection S Q R POR 3.3V VCC - + 3.3V 4 PGND 200k 18k - + Diode Emulation Comparator IR3551 Offset -+ VCC Figure 6: IR3551 Functional Block Diagram |
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