Datasheet LTC3778 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Wide Operating Range, No RSENSE Step-Down Controller |
| Pages / Page | 24 / 4 — TYPICAL PERFOR A CE CHARACTERISTICS. Transient Response. (Discontinuous … |
| File Format / Size | PDF / 312 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. Transient Response. (Discontinuous Mode). Start-Up. Efficiency vs Load Current
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Text Version of Document
LTC3778
W U TYPICAL PERFOR A CE CHARACTERISTICS Transient Response Transient Response (Discontinuous Mode) Start-Up
RUN/SS V V OUT OUT 2V/DIV 50mV/DIV 50mV/DIV VOUT 1V/DIV I I L L I 5A/DIV 5A/DIV L 5A/DIV 20µs/DIV 3778 G01 20µs/DIV 3778 G02 50ms/DIV 3778 G19 LOAD STEP 0A TO 10A LOAD STEP 1A TO 10A VIN = 15V VIN = 15V VIN = 15V VOUT = 2.5V VOUT = 2.5V VOUT = 2.5V RLOAD = 0.125Ω FCB = 0V FCB = INTVCC FIGURE 1 CIRCUIT FIGURE 1 CIRCUIT
Efficiency vs Load Current Efficiency vs Input Voltage Frequency vs Input Voltage
100 100 300 FCB = 5V FCB = 0V FIGURE 1 CIRCUIT FIGURE 1 CIRCUIT DISCONTINUOUS 90 280 MODE 95 IOUT = 10A ILOAD = 1A 80 260 CONTINUOUS 90 MODE ILOAD = 10A 70 240 IOUT = 0A EFFICIENCY (%) EFFICIENCY (%) FREQUENCY (kHz) 85 V 60 IN = 10V 220 VOUT = 2.5V EXTVCC = 5V FIGURE 1 CIRCUIT 50 80 200 0.001 0.01 0.1 1 10 0 5 10 15 20 25 30 5 10 15 20 25 LOAD CURRENT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 3778 G03 3778 G04 3778 G05
Current Sense Threshold Load Regulation ITH Voltage vs Load Current vs ITH Voltage
0 2.5 300 FIGURE 1 CIRCUIT FIGURE 1 CIRCUIT V 2V RNG = VRNG = 1V 2.0 200 1.4V –0.1 1V 1.5 100 0.7V (%) 0.5V –0.2 CONTINUOUS OUT MODE ∆V VOLTAGE (V) 1.0 0 I TH –0.3 DISCONTINUOUS 0.5 MODE –100 CURRENT SENSE THRESHOLD (mV) –0.4 0 –200 0 2 4 6 8 10 0 5 10 15 0 0.5 1.0 1.5 2.0 2.5 3.0 LOAD CURRENT (A) LOAD CURRENT (A) ITH VOLTAGE (V) 3778 G06 3778 G07 3778 G08 3778f 4
W U TYPICAL PERFOR A CE CHARACTERISTICS Transient Response Transient Response (Discontinuous Mode) Start-Up
RUN/SS V V OUT OUT 2V/DIV 50mV/DIV 50mV/DIV VOUT 1V/DIV I I L L I 5A/DIV 5A/DIV L 5A/DIV 20µs/DIV 3778 G01 20µs/DIV 3778 G02 50ms/DIV 3778 G19 LOAD STEP 0A TO 10A LOAD STEP 1A TO 10A VIN = 15V VIN = 15V VIN = 15V VOUT = 2.5V VOUT = 2.5V VOUT = 2.5V RLOAD = 0.125Ω FCB = 0V FCB = INTVCC FIGURE 1 CIRCUIT FIGURE 1 CIRCUIT
Efficiency vs Load Current Efficiency vs Input Voltage Frequency vs Input Voltage
100 100 300 FCB = 5V FCB = 0V FIGURE 1 CIRCUIT FIGURE 1 CIRCUIT DISCONTINUOUS 90 280 MODE 95 IOUT = 10A ILOAD = 1A 80 260 CONTINUOUS 90 MODE ILOAD = 10A 70 240 IOUT = 0A EFFICIENCY (%) EFFICIENCY (%) FREQUENCY (kHz) 85 V 60 IN = 10V 220 VOUT = 2.5V EXTVCC = 5V FIGURE 1 CIRCUIT 50 80 200 0.001 0.01 0.1 1 10 0 5 10 15 20 25 30 5 10 15 20 25 LOAD CURRENT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 3778 G03 3778 G04 3778 G05
Current Sense Threshold Load Regulation ITH Voltage vs Load Current vs ITH Voltage
0 2.5 300 FIGURE 1 CIRCUIT FIGURE 1 CIRCUIT V 2V RNG = VRNG = 1V 2.0 200 1.4V –0.1 1V 1.5 100 0.7V (%) 0.5V –0.2 CONTINUOUS OUT MODE ∆V VOLTAGE (V) 1.0 0 I TH –0.3 DISCONTINUOUS 0.5 MODE –100 CURRENT SENSE THRESHOLD (mV) –0.4 0 –200 0 2 4 6 8 10 0 5 10 15 0 0.5 1.0 1.5 2.0 2.5 3.0 LOAD CURRENT (A) LOAD CURRENT (A) ITH VOLTAGE (V) 3778 G06 3778 G07 3778 G08 3778f 4
