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NX2423 Datasheet(PDF) 7 Page - Microsemi Corporation |
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NX2423 Datasheet(HTML) 7 Page - Microsemi Corporation |
7 / 20 page NX2423 7 Rev. 2.1 12/01/08 BLOCK DIAGRAM Figure 2 - Block diagram of NX2423 OFF ON CScomp(SS/EN) PWM control logic and driver V1.25 V1.25 Slave channel control FB VCOMP EN2_B 0.82/0.74 Bias generator 5VCC 1.25V 1.6V 0.6V UVLO UVLO ramp1 S R Q Set1 FET driver ramp2 set2 start Hiccup Digital start Dis_EA SS_finish Rt 6 Cycles filter Hiccup Logic Hiccup BST1 DrvH1 PVCC DrvL1 PGND CS+1 CS-1 CS+2 CS-2 Vp*75% SS_finished AGND Two phase OSC ÷ 2 Σ Σ V1.25 gm=0.04A/V KR KR KR KR R R R R CS01 CS02 BST2 DrvH2 DrvL2 SW1 SW2 IOUT/IMAX Vp*130% OVP OVP K=30 1.25V FB VOUT +1.2V/50A +5V +12V VOUT +5V 0.35 /0.3V FB Vp*70% SS_FINISHED DAC REFIN Vp 3.6 /3.3V 0.6V 1.25V FILTER FILTER +5V +12V VCCDRV 1.25V INREFOUT/POK ENBUS_2 ENBUS_2 ON OFF |
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