Datasheet LTC3830, LTC3830-1 (Analog Devices) - 5
| 制造商 | Analog Devices |
| 描述 | High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation |
| 页数 / 页 | 24 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS. Maximum G1 Duty Cycle. IMAX Sink … |
| 文件格式/大小 | PDF / 277 Kb |
| 文件语言 | 英语 |
TYPICAL PERFOR A CE CHARACTERISTICS. Maximum G1 Duty Cycle. IMAX Sink Current. vs Temperature. Output Overcurrent Protection
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LTC3830/LTC3830-1
W U TYPICAL PERFOR A CE CHARACTERISTICS Maximum G1 Duty Cycle IMAX Sink Current vs Temperature vs Temperature Output Overcurrent Protection
100 20 4.0 VFB = 0V 99 REFER TO FIGURE 3 18 3.5 98 A) 16 3.0 µ 97 14 2.5 96 12 2.0 95 10 1.5 94 SINK CURRENT ( OUTPUT VOLTAGE (V) 93 I MAX 8 1.0 MAXIMUM G1 DUTY CYCLE (%) TA = 25°C 92 6 0.5 REFER TO FIGURE 12 RIMAX = 5k 91 4 0 –50 –25 0 25 50 75 100 125 – 50 – 25 0 25 50 75 100 125 0 2 4 6 8 10 12 14 TEMPERATURE (°C) TEMPERATURE (°C) OUTPUT CURRENT (A) 3830 G11 3830 G12 3830 G13
Output Current Limit Threshold Soft-Start Source Current Soft-Start Sink Current vs Temperature vs Temperature vs (VIFB – VIMAX)
16 –8 2.00 TA = 25°C 14 A) –9 1.75 µ 12 –10 1.50 10 –11 1.25 8 –12 1.00 6 –13 0.75 4 –14 0.50 OUTPUT CURRENT LIMIT (A) REFER TO FIGURE 12 AND NOTE 10 OF 2 SOFT-START SINK CURRENT (mA) THE ELECTRICAL CHARACTERISTICS SOFT-START SOURCE CURRENT ( –15 0.25 RIMAX = 5k 0 –16 0 –50 –25 0 25 50 75 100 125 – 50 – 25 0 25 50 75 100 125 –150 –125 –100 –75 –50 –25 0 TEMPERATURE (°C) TEMPERATURE (°C) VIFB – VIMAX (mV) 3830 G14 3830 G15 3830 G16
Undervoltage Lockout Threshold VCC Operating Supply Current PVCC Supply Current Voltage vs Temperature vs Temperature vs Oscillator Frequency
3.0 1.6 90 FREQSET FLOATING TA = 25°C 2.9 1.5 80 1.4 G1 AND G2 LOADED 2.8 70 WITH 6800pF, 1.3 2.7 PVCC1,2 = 12V 1.2 60 2.6 1.1 50 G1 AND G2 G1 AND G2 2.5 1.0 LOADED LOADED 40 WITH 6800pF, 2.4 0.9 WITH 1000pF, PVCC1,2 = 5V 0.8 30 PVCC1,2 = 5V 2.3 SUPPLY CURRENT (mA) 0.7 CC 2.2 20 PV OPERATING SUPPLY CURRENT (mA) 0.6 2.1 CC 10 V 0.5 2.0 0.4 0 –50 UNDERVOLTAGE LOCKOUT THRESHOLD VOLTAGE (V) –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 100 200 300 400 500 TEMPERATURE (°C) TEMPERATURE (°C) OSCILLATOR FREQUENCY (kHz) 3830 G17 3830 G18 3830 G19 3830fa 5
W U TYPICAL PERFOR A CE CHARACTERISTICS Maximum G1 Duty Cycle IMAX Sink Current vs Temperature vs Temperature Output Overcurrent Protection
100 20 4.0 VFB = 0V 99 REFER TO FIGURE 3 18 3.5 98 A) 16 3.0 µ 97 14 2.5 96 12 2.0 95 10 1.5 94 SINK CURRENT ( OUTPUT VOLTAGE (V) 93 I MAX 8 1.0 MAXIMUM G1 DUTY CYCLE (%) TA = 25°C 92 6 0.5 REFER TO FIGURE 12 RIMAX = 5k 91 4 0 –50 –25 0 25 50 75 100 125 – 50 – 25 0 25 50 75 100 125 0 2 4 6 8 10 12 14 TEMPERATURE (°C) TEMPERATURE (°C) OUTPUT CURRENT (A) 3830 G11 3830 G12 3830 G13
Output Current Limit Threshold Soft-Start Source Current Soft-Start Sink Current vs Temperature vs Temperature vs (VIFB – VIMAX)
16 –8 2.00 TA = 25°C 14 A) –9 1.75 µ 12 –10 1.50 10 –11 1.25 8 –12 1.00 6 –13 0.75 4 –14 0.50 OUTPUT CURRENT LIMIT (A) REFER TO FIGURE 12 AND NOTE 10 OF 2 SOFT-START SINK CURRENT (mA) THE ELECTRICAL CHARACTERISTICS SOFT-START SOURCE CURRENT ( –15 0.25 RIMAX = 5k 0 –16 0 –50 –25 0 25 50 75 100 125 – 50 – 25 0 25 50 75 100 125 –150 –125 –100 –75 –50 –25 0 TEMPERATURE (°C) TEMPERATURE (°C) VIFB – VIMAX (mV) 3830 G14 3830 G15 3830 G16
Undervoltage Lockout Threshold VCC Operating Supply Current PVCC Supply Current Voltage vs Temperature vs Temperature vs Oscillator Frequency
3.0 1.6 90 FREQSET FLOATING TA = 25°C 2.9 1.5 80 1.4 G1 AND G2 LOADED 2.8 70 WITH 6800pF, 1.3 2.7 PVCC1,2 = 12V 1.2 60 2.6 1.1 50 G1 AND G2 G1 AND G2 2.5 1.0 LOADED LOADED 40 WITH 6800pF, 2.4 0.9 WITH 1000pF, PVCC1,2 = 5V 0.8 30 PVCC1,2 = 5V 2.3 SUPPLY CURRENT (mA) 0.7 CC 2.2 20 PV OPERATING SUPPLY CURRENT (mA) 0.6 2.1 CC 10 V 0.5 2.0 0.4 0 –50 UNDERVOLTAGE LOCKOUT THRESHOLD VOLTAGE (V) –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 100 200 300 400 500 TEMPERATURE (°C) TEMPERATURE (°C) OSCILLATOR FREQUENCY (kHz) 3830 G17 3830 G18 3830 G19 3830fa 5