Datasheet LT1976, LT1976B (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | High Voltage 1.5A, 200kHz Step-Down Switching Regulator with 100µA Quiescent Current |
| Pages / Page | 28 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS. LT1976 Efficiency and Power Loss. … |
| File Format / Size | PDF / 314 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. LT1976 Efficiency and Power Loss. LT1976B Efficiency and Power. vs Load Current
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LT1976/LT1976B
W U TYPICAL PERFOR A CE CHARACTERISTICS LT1976 Efficiency and Power Loss LT1976B Efficiency and Power vs Load Current Loss vs Load Current FB Voltage
100 10 100 10 1.30 EFFICIENCY 1.29 EFFICIENCY 1.28 75 1 75 1 POWER LOSS (W) POWER LOSS (W) 1.27 5V 5V 3.3V 1.26 3.3V 50 0.1 50 0.1 1.25 TYPICAL TYPICAL POWER LOSS VOLTAGE (V) 1.24 EFFICIENCY (%) POWER LOSS EFFICIENCY (%) 1.23 25 0.01 25 0.01 1.22 1.21 0 0.001 0 0.001 1.20 0.1 1 10 100 1000 10000 0.1 1 10 100 1000 10000 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (mA) LOAD CURRENT (mA) 1976 TA02 TEMPERATURE (°C) 1976 G25 1976 G01
Oscillator Frequency SHDN Threshold SHDN Pin Current
250 1.40 5.5 TJ = 25°C 240 5.0 1.35 230 4.5 1.30 220 4.0 1.25 210 μA) 3.5 200 1.20 3.0 190 VOLTAGE (V) 2.5 0.15 CURRENT ( FREQUENCY (kHz) 180 2.0 1.10 170 1.5 1.05 160 1.0 150 1.00 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 0 10 20 30 40 50 60 TEMPERATURE (°C) TEMPERATURE (°C) SHDN VOLTAGE (V) 1976 G02 1976 G03 1976 G04
LT1976 Sleep Mode Supply Shutdown Supply Current Current LT1976 Bias Sleep Current
25 240 200 220 180 200 20 VBIAS = 0V 160 V 180 IN = 60V 140 160 μA) 15 μA) μA) 120 140 120 100 10 100 80 CURRENT ( CURRENT ( CURRENT ( 80 VBIAS = 5V 60 60 5 40 40 VIN = 42V VIN = 12V 20 20 0 0 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1976 G05 1976 G06 1976 G07 1976bfg 5
W U TYPICAL PERFOR A CE CHARACTERISTICS LT1976 Efficiency and Power Loss LT1976B Efficiency and Power vs Load Current Loss vs Load Current FB Voltage
100 10 100 10 1.30 EFFICIENCY 1.29 EFFICIENCY 1.28 75 1 75 1 POWER LOSS (W) POWER LOSS (W) 1.27 5V 5V 3.3V 1.26 3.3V 50 0.1 50 0.1 1.25 TYPICAL TYPICAL POWER LOSS VOLTAGE (V) 1.24 EFFICIENCY (%) POWER LOSS EFFICIENCY (%) 1.23 25 0.01 25 0.01 1.22 1.21 0 0.001 0 0.001 1.20 0.1 1 10 100 1000 10000 0.1 1 10 100 1000 10000 –50 –25 0 25 50 75 100 125 150 LOAD CURRENT (mA) LOAD CURRENT (mA) 1976 TA02 TEMPERATURE (°C) 1976 G25 1976 G01
Oscillator Frequency SHDN Threshold SHDN Pin Current
250 1.40 5.5 TJ = 25°C 240 5.0 1.35 230 4.5 1.30 220 4.0 1.25 210 μA) 3.5 200 1.20 3.0 190 VOLTAGE (V) 2.5 0.15 CURRENT ( FREQUENCY (kHz) 180 2.0 1.10 170 1.5 1.05 160 1.0 150 1.00 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 0 10 20 30 40 50 60 TEMPERATURE (°C) TEMPERATURE (°C) SHDN VOLTAGE (V) 1976 G02 1976 G03 1976 G04
LT1976 Sleep Mode Supply Shutdown Supply Current Current LT1976 Bias Sleep Current
25 240 200 220 180 200 20 VBIAS = 0V 160 V 180 IN = 60V 140 160 μA) 15 μA) μA) 120 140 120 100 10 100 80 CURRENT ( CURRENT ( CURRENT ( 80 VBIAS = 5V 60 60 5 40 40 VIN = 42V VIN = 12V 20 20 0 0 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1976 G05 1976 G06 1976 G07 1976bfg 5
