Datasheet LTC7817 (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | 40V, Low IQ, 3MHz, Triple Output Buck/Buck/Boost Synchronous Controller |
| Pages / Page | 44 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss. … |
| File Format / Size | PDF / 3.0 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss. Efficiency. vs Output Current (Boost). Efficiency vs Input V
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LTC7817
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss Efficiency Efficiency and Power Loss Efficiency vs Output Current (Boost) vs Output Current (Boost) vs Output Current (Boost) vs Output Current (Boost) Efficiency vs Input V Efficiency vs Input V oltage (Boost) oltage (Boost)
100 100 100 100 BURST EFFICIENCY FIGURE 10 CIRCUIT 90 V PULSE–SKIPPING MODE 95 IN = 8V 98 VOUT = 10V 80 PULSE–SKIPPING 10 EFFICIENCY 90 96 70 POWER LOSS (W) VIN = 5V I FCM EFFICIENCY LOAD = 2A 60 1 85 94 ILOAD = 4A 50 FCM LOSS 80 92 40 BURST 0.1 90 EFFICIENCY (%) 75 EFFICIENCY (%) EFFICIENCY (%) 30 PULSE LOSS SKIPPING 70 88 20 LOSS V 0.01 IN = 5V FIGURE 10 CIRCUIT V 10 86 OUT = 10V 65 BURST MODE OPERATION FIGURE 10 CIRCUIT VOUT = 10V 0 0.001 60 84 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 0 2 4 6 8 10 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 7817 G10 7817 G11 7817 G12
Load Step (Boost) Load Step (Boost) Load Step (Boost) Load Step (Boost) Load Step (Boost) Load Step (Boost) Burst Mode Operation Pulse-Skipping Mode Pulse–Skipping Mode Forced Continuous Mode
VOUT3 VOUT3 VOUT3 500mV/DIV 500mV/DIV 500mV/DIV INDUCTOR INDUCTOR INDUCTOR CURRENT CURRENT CURRENT 5A/DIV 5A/DIV 5A/DIV LOAD LOAD LOAD CURRENT CURRENT CURRENT 5A/DIV 5A/DIV 5A/DIV 100µs/DIV 7817 G13 100µs/DIV 7817 G14 100µs/DIV 7817 G15 VIN = 5V VIN = 5V VIN = 5V VOUT = 10V VOUT = 10V VOUT = 10V 300mA TO 3.3A LOAD STEP 300mA TO 3.3A LOAD STEP 300mA TO 3.3A LOAD STEP FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT
Inductor Current at Light Load Inductor Current at Light Load Boost Regulated Feedback (Boost) Soft Start-Up (Boost) Soft Start–Up (Boost) Voltage vs Temperature
1.207 FORCED RUN3 1.204 CONTINUOUS 5V/DIV MODE 1.201 TAGE (V) 1.198 BURST MODE OPERATION 1.195 5A/DIV VOUT3 PULSE 2V/DIV FIGURE 10 CIRCUIT 1.192 SKIPPING TED FEEDBACK VOL MODE VIN = 5V 1.189 GND 7817 G17 4µs/DIV 7817 G16 2ms/DIV REGULA 1.186 VIN = 5V V V IN = 5V OUT = 10V FIGURE 10 CIRCUIT 1.183 NO LOAD –55 –25 5 35 65 95 125 155 FIGURE 10 CIRCUIT TEMPERATURE (oC) 7817 G18 Rev 0 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss Efficiency Efficiency and Power Loss Efficiency vs Output Current (Boost) vs Output Current (Boost) vs Output Current (Boost) vs Output Current (Boost) Efficiency vs Input V Efficiency vs Input V oltage (Boost) oltage (Boost)
100 100 100 100 BURST EFFICIENCY FIGURE 10 CIRCUIT 90 V PULSE–SKIPPING MODE 95 IN = 8V 98 VOUT = 10V 80 PULSE–SKIPPING 10 EFFICIENCY 90 96 70 POWER LOSS (W) VIN = 5V I FCM EFFICIENCY LOAD = 2A 60 1 85 94 ILOAD = 4A 50 FCM LOSS 80 92 40 BURST 0.1 90 EFFICIENCY (%) 75 EFFICIENCY (%) EFFICIENCY (%) 30 PULSE LOSS SKIPPING 70 88 20 LOSS V 0.01 IN = 5V FIGURE 10 CIRCUIT V 10 86 OUT = 10V 65 BURST MODE OPERATION FIGURE 10 CIRCUIT VOUT = 10V 0 0.001 60 84 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 0 2 4 6 8 10 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 7817 G10 7817 G11 7817 G12
Load Step (Boost) Load Step (Boost) Load Step (Boost) Load Step (Boost) Load Step (Boost) Load Step (Boost) Burst Mode Operation Pulse-Skipping Mode Pulse–Skipping Mode Forced Continuous Mode
VOUT3 VOUT3 VOUT3 500mV/DIV 500mV/DIV 500mV/DIV INDUCTOR INDUCTOR INDUCTOR CURRENT CURRENT CURRENT 5A/DIV 5A/DIV 5A/DIV LOAD LOAD LOAD CURRENT CURRENT CURRENT 5A/DIV 5A/DIV 5A/DIV 100µs/DIV 7817 G13 100µs/DIV 7817 G14 100µs/DIV 7817 G15 VIN = 5V VIN = 5V VIN = 5V VOUT = 10V VOUT = 10V VOUT = 10V 300mA TO 3.3A LOAD STEP 300mA TO 3.3A LOAD STEP 300mA TO 3.3A LOAD STEP FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT
Inductor Current at Light Load Inductor Current at Light Load Boost Regulated Feedback (Boost) Soft Start-Up (Boost) Soft Start–Up (Boost) Voltage vs Temperature
1.207 FORCED RUN3 1.204 CONTINUOUS 5V/DIV MODE 1.201 TAGE (V) 1.198 BURST MODE OPERATION 1.195 5A/DIV VOUT3 PULSE 2V/DIV FIGURE 10 CIRCUIT 1.192 SKIPPING TED FEEDBACK VOL MODE VIN = 5V 1.189 GND 7817 G17 4µs/DIV 7817 G16 2ms/DIV REGULA 1.186 VIN = 5V V V IN = 5V OUT = 10V FIGURE 10 CIRCUIT 1.183 NO LOAD –55 –25 5 35 65 95 125 155 FIGURE 10 CIRCUIT TEMPERATURE (oC) 7817 G18 Rev 0 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Typical Application Related Parts
