Datasheet LTC3823 (Analog Devices) - 6

LTC3823
TYPICAL PERFORMANCE CHARACTERISTICS Track Down Transient Response Effi ciency vs Load Current
100 FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT FIGURE 12 CIRCUIT 95 TRACK/SS V DISCONTINUOUS MODE OUT TRACK/SS 100mV/DIV 90 AND VFB V 85 500mV/DIV FB CONTINUOUS MODE 80 V V OUT 75 OUT 2V/DIV IL 70 5A/DIV EFFICIENCY (%) STEP 65 0A TO 10A 60 250ms/DIV 3823 G13 20μs/DIV 3823 G14 55 50 0.1 1 10 LOAD CURRENT (A) 3823 G15
ITH Voltage vs Load Current Frequency vs Input Voltage Effi ciency vs Input Voltage
1400 360 100 FIGURE 12 CIRCUIT FCB = 5V I 98 FIGURE 12 CIRCUIT 1200 LOAD = 10A 340 96 1000 94 CONTINUOUS MODE 320 92 800 ILOAD = 1A ILOAD = 10A 300 90 I 600 LOAD = 1A VOLTAGE (mV) 88 EFFICIENCY (%) I TH DISCONTINUOUS MODE FREQUENCY (kHz) 280 400 86 84 260 200 FCB = 0V 82 FIGURE 12 CIRCUIT 0 240 80 0 1 2 3 4 5 6 7 8 9 10 0 5 10 15 20 25 0 5 10 15 20 25 LOAD CURRENT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 3823 G16 3823 G17 3823 G18
Frequency vs Load Current Current Limit Foldback ION Current vs VIN
400 160 140 FIGURE 12 CIRCUIT CONTINUOUS VRNG = 1V RON = 82k 350 MODE 140 120 300 120 DISCONTINUOUS MODE 100 250 100 80 200 80 60 150 60 CURRENT (μA) FREQUENCY (kHz) I ON 40 100 40 50 20 20 0 MAXIMUM CURRENT SENSE THRESHOLD (mV) 0 0 0 1 2 3 4 5 6 7 8 9 10 0 0.1 0.2 0.3 0.4 0.5 0.6 0 5 10 15 20 25 30 35 LOAD CURRENT (A) VFB (V) INPUT VOLTAGE, VIN (V) 3823 G19 3823 G20 3823 G21 3823fd 6