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MAX1531ETJ+ Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX1531ETJ+ Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 33 page Multiple-Output Power-Supply Controllers for LCD Monitors _______________________________________________________________________________________ 7 Typical Operating Characteristics (Circuit of Figure 1; including R5, R6, and D2; TA = +25°C, unless otherwise noted.) STEP-DOWN EFFICIENCY vs. LOAD CURRENT LOAD CURRENT (mA) 1200 900 600 300 60 70 80 90 100 50 0 1500 VIN = 12V VIN = 20V fSW = 500kHz STEP-DOWN LOAD REGULATION LOAD CURRENT (mA) 1200 900 600 300 -0.12 -0.08 -0.04 0 -0.16 0 1500 SWITCHING FREQUENCY vs. LOAD CURRENT 485 490 495 500 510 505 515 520 480 LOAD CURRENT (mA) 1200 900 600 300 0 1500 STEP-DOWN REGULATOR LOAD TRANSIENT MAX1530 toc04 40 µs/div A: LOAD CURRENT, 1A/div B: OUTPUT VOLTAGE, 200mV/div, AC-COUPLED C: INDUCTOR CURRENT, 1A/div A 0A B 3.3V 0A C STEP-DOWN REGULATOR SWITCHING WAVEFORM MAX1530 toc05 2 µs/div A B C A: LX, 10V/div B: OUTPUT VOLTAGE, 20 mV/div, AC-COUPLED C: INDUCTOR CURRENT, 1A/div 0V 3.3V 0A VL LOAD REGULATION LOAD CURRENT (mA) 25 20 15 10 5 -0.4 -0.3 -0.2 -0.1 0 -0.5 030 STARTUP SEQUENCE MAX1530 toc08 4ms/div A: VL, 10V/div B: VOUT, 5V/div C: VLOGIC, 5V/div D: VSOURCE, 20V/div E: VGAMMA, 20V/div F: VGOFF, 20V/div G: VGON, 40V/div A B C D E F G LR1 BASE CURRENT vs. DRV1 VOLTAGE DRV1 VOLTAGE (V) 8 6 4 2 3 6 9 12 15 0 010 VFBL1 = 1.175V STEP-DOWN REGULATOR SOFT-START MAX1530 toc06 1ms/div A C A: EN, 2V/div B: OUTPUT VOLTAGE, 2V/div C: INDUCTOR CURRENT, 1A/div 0V 0V B 0A |
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