Datasheet LT1977 (Analog Devices) - 4
| 制造商 | Analog Devices |
| 描述 | High Voltage 1.5A, 500kHz Step-Down Switching Regulator with 100µA Quiescent Current |
| 页数 / 页 | 24 / 4 — TYPICAL PERFOR A CE CHARACTERISTICS. FB Voltage. Oscillator Frequency. … |
| 文件格式/大小 | PDF / 334 Kb |
| 文件语言 | 英语 |
TYPICAL PERFOR A CE CHARACTERISTICS. FB Voltage. Oscillator Frequency. SHDN Threshold. SHDN Pin Current. Shutdown Supply Current
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LT1977
W U TYPICAL PERFOR A CE CHARACTERISTICS FB Voltage Oscillator Frequency SHDN Threshold
1.30 550 1.40 1.29 540 1.35 1.28 530 1.30 1.27 520 1.25 1.26 510 1.25 500 1.20 490 VOLTAGE (V) 1.24 VOLTAGE (V) 0.15 FREQUENCY (kHz) 1.23 480 1.10 1.22 470 1.05 1.21 460 1.20 450 1.00 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1977 G01 1977 G02 1977 G03
SHDN Pin Current Shutdown Supply Current Sleep Mode Supply Current
5.5 25 200 TJ = 25°C 5.0 180 4.5 20 160 VBIAS = 0V VIN = 60V 4.0 140 µA) 3.5 µA) 15 µA) 120 3.0 100 2.5 10 80 CURRENT ( CURRENT ( CURRENT ( 2.0 60 VBIAS = 5V 1.5 5 40 V 1.0 IN = 42V VIN = 12V 20 0 0 0 0 10 20 30 40 50 60 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 SHDN VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 1977 G04 1977 G05 1977 G06
Bias Sleep Current PGFB Threshold PG Sink Current
200 1.20 250 180 1.18 160 1.16 200 140 1.14 µA) 120 1.12 µA) 150 100 1.10 80 1.08 100 CURRENT ( VOLTAGE (V) CURRENT ( 60 1.06 40 1.04 50 20 1.02 0 1.00 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1977 G07 1977 G08 1977 G09 1977fa 4
W U TYPICAL PERFOR A CE CHARACTERISTICS FB Voltage Oscillator Frequency SHDN Threshold
1.30 550 1.40 1.29 540 1.35 1.28 530 1.30 1.27 520 1.25 1.26 510 1.25 500 1.20 490 VOLTAGE (V) 1.24 VOLTAGE (V) 0.15 FREQUENCY (kHz) 1.23 480 1.10 1.22 470 1.05 1.21 460 1.20 450 1.00 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1977 G01 1977 G02 1977 G03
SHDN Pin Current Shutdown Supply Current Sleep Mode Supply Current
5.5 25 200 TJ = 25°C 5.0 180 4.5 20 160 VBIAS = 0V VIN = 60V 4.0 140 µA) 3.5 µA) 15 µA) 120 3.0 100 2.5 10 80 CURRENT ( CURRENT ( CURRENT ( 2.0 60 VBIAS = 5V 1.5 5 40 V 1.0 IN = 42V VIN = 12V 20 0 0 0 0 10 20 30 40 50 60 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 SHDN VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 1977 G04 1977 G05 1977 G06
Bias Sleep Current PGFB Threshold PG Sink Current
200 1.20 250 180 1.18 160 1.16 200 140 1.14 µA) 120 1.12 µA) 150 100 1.10 80 1.08 100 CURRENT ( VOLTAGE (V) CURRENT ( 60 1.06 40 1.04 50 20 1.02 0 1.00 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1977 G07 1977 G08 1977 G09 1977fa 4