Datasheet LTC3896 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | 150V Low IQ, Synchronous Inverting DC/DC Controller |
| Pages / Page | 36 / 6 — Typical perForMance characTerisTics |
| File Format / Size | PDF / 2.0 Mb |
| Document Language | English |
Typical perForMance characTerisTics
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LTC3896
Typical perForMance characTerisTics V – – IN and VOUT with respect to GND. All other voltages with respect to VOUT , unless otherwise noted. Efficiency and Power Loss vs Load Current Efficiency vs Load Current Efficiency vs Input Voltage
100 100k 100 100 BURST EFFICIENCY PS EFFICIENCY 90 90 98 80 80 96 10k POWER LOSS (mW) 70 70 94 60 60 92 50 FCM LOSS 1k 50 90 FCM EFFICIENCY 40 PS LOSS 40 88 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 BURST LOSS 30 86 100 20 FIGURE 16 CIRCUIT 20 V 84 IN = 36V FIGURE 16 CIRCUIT V FIGURE 16 CIRCUIT – 10 IN = +48V V 10 IN = 48V V 82 OUT = –48V V – – OUT = –48V VOUT = –48V VIN = 72V ILOAD = 1.5A 0 10 0 80 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 35 40 45 50 55 60 65 70 75 LOAD CURRENT (A) LOAD CURRENT (A) INPUT VOLTAGE (V) 3896 G01 3896 G02 3896 G03
Load Step Forced Continuous Load Step Burst Mode Operation Load Step Pulse-Skipping Mode Mode
V – – – OUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC-COUPLED AC-COUPLED AC-COUPLED IL IL IL 1A/DIV 1A/DIV 1A/DIV 200µs/DIV 3896 G04 200µs/DIV 3896 G05 200µs/DIV 3896 G06 V – OUT = –48V V – – OUT = –48V VOUT = –48V LOAD STEP = 0A to 1A LOAD STEP = 0A to 1A LOAD STEP = 0A to 1A FIGURE 16 CIRCUIT FIGURE 16 CIRCUIT FIGURE 16 CIRCUIT
Regulated Feedback Voltage vs Inductor Current at Light Load Soft Start-Up Temperature
808 FORCED RUN 806 CONTINUOUS 2V/DIV MODE GND 804 TAGE (V) BURST MODE 802 OPERATION GND 2A/DIV 800 PULSE- V – 798 SKIPPING OUT 20V/DIV MODE TED FEEDBACK VOL 796 10µs/DIV 3896 G07 1ms/DIV 3896 G08 REGULA 794 V – – OUT = –48V VOUT = –48V ILOAD = 1mA FIGURE 16 CIRCUIT 792 FIGURE 16 CIRCUIT –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) 3896 G09 3896f 6 For more information www.linear.com/LTC3896 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
Typical perForMance characTerisTics V – – IN and VOUT with respect to GND. All other voltages with respect to VOUT , unless otherwise noted. Efficiency and Power Loss vs Load Current Efficiency vs Load Current Efficiency vs Input Voltage
100 100k 100 100 BURST EFFICIENCY PS EFFICIENCY 90 90 98 80 80 96 10k POWER LOSS (mW) 70 70 94 60 60 92 50 FCM LOSS 1k 50 90 FCM EFFICIENCY 40 PS LOSS 40 88 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 BURST LOSS 30 86 100 20 FIGURE 16 CIRCUIT 20 V 84 IN = 36V FIGURE 16 CIRCUIT V FIGURE 16 CIRCUIT – 10 IN = +48V V 10 IN = 48V V 82 OUT = –48V V – – OUT = –48V VOUT = –48V VIN = 72V ILOAD = 1.5A 0 10 0 80 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 35 40 45 50 55 60 65 70 75 LOAD CURRENT (A) LOAD CURRENT (A) INPUT VOLTAGE (V) 3896 G01 3896 G02 3896 G03
Load Step Forced Continuous Load Step Burst Mode Operation Load Step Pulse-Skipping Mode Mode
V – – – OUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC-COUPLED AC-COUPLED AC-COUPLED IL IL IL 1A/DIV 1A/DIV 1A/DIV 200µs/DIV 3896 G04 200µs/DIV 3896 G05 200µs/DIV 3896 G06 V – OUT = –48V V – – OUT = –48V VOUT = –48V LOAD STEP = 0A to 1A LOAD STEP = 0A to 1A LOAD STEP = 0A to 1A FIGURE 16 CIRCUIT FIGURE 16 CIRCUIT FIGURE 16 CIRCUIT
Regulated Feedback Voltage vs Inductor Current at Light Load Soft Start-Up Temperature
808 FORCED RUN 806 CONTINUOUS 2V/DIV MODE GND 804 TAGE (V) BURST MODE 802 OPERATION GND 2A/DIV 800 PULSE- V – 798 SKIPPING OUT 20V/DIV MODE TED FEEDBACK VOL 796 10µs/DIV 3896 G07 1ms/DIV 3896 G08 REGULA 794 V – – OUT = –48V VOUT = –48V ILOAD = 1mA FIGURE 16 CIRCUIT 792 FIGURE 16 CIRCUIT –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) 3896 G09 3896f 6 For more information www.linear.com/LTC3896 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
