Datasheet LTC3852 (Analog Devices) - 6
| 制造商 | Analog Devices |
| 描述 | Low Input Voltage, Synchronous Step-Down DC/DC Controller |
| 页数 / 页 | 32 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Controller Maximum Current. … |
| 文件格式/大小 | PDF / 429 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Controller Maximum Current. Controller Input DC Supply. Sense Threshold
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LTC3852
TYPICAL PERFORMANCE CHARACTERISTICS Controller Maximum Current Controller Input DC Supply Sense Threshold Controller Maximum Peak Current Current vs Input Voltage (VIN2) vs Common Mode Voltage Sense Threshold vs ITH Voltage
3.0 90 90 DUTY CYCLE RANGE: 0% TO 100% 80 80 2.5 70 70 60 2.0 60 50 50 (mV) 40 1.5 40 30 Y CURRENT (mA) SENSE THRESHOLD (mV) V 20 1.0 30 SUPPL SENSE 10 V 20 0.5 0 10 –10 0 0 –20 4 8 12 16 20 24 28 32 36 40 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 INPUT VOLTAGE (V) V V SENSE COMMON MODE VOLTAGE (V) ITH (V) 3852 G12 3852 G14 3852 G15
Controller Burst Mode Peak Controller Maximum Current Current Sense Threshold Controller Maximum Current Sense Threshold vs Feedback vs ITH Voltage Sense Threshold vs Duty Cycle Voltage (Current Foldback)
60 90 90 MAXIMUM 80 80 50 70 70 40 60 (mV) 60 (mV) 50 SENSE 50 30 40 40 SENSEV 20 30 30 MINIMUM MAXIMUM V 20 20 10 BURST COMPARATOR FALLING THRESHOLD: CURRENT SENSE THRESHOLD (mV) 10 10 VITH = 0.4V 0 0 0 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 0 20 40 60 80 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 VITH (V) DUTY CYCLE (%) FEEDBACK VOLTAGE (V) 3852 G16 3852 G17 3852 G18
Controller TRACK/SS Pull-Up Controller Shutdown (RUN) Controller Regulated Feedback Current vs Temperature Threshold vs Temperature Voltage vs Temperature
1.5 1.4 806 1.4 1.3 1.3 804 RUN RISING THRESHOLD (ON) 1.2 802 1.1 1.2 1.0 RUN FALLING THRESHOLD (OFF) 800 0.9 1.1 0.8 798 RUN PIN VOLTAGE (V) TRACK/SS CURRENT (μA) 0.7 1.0 796 0.6 REGULATED FEEDBACK VOLTAGE (mV) 0.5 0.9 794 –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) 3852 G19 3852 G20 3852 G21 3852f 6
TYPICAL PERFORMANCE CHARACTERISTICS Controller Maximum Current Controller Input DC Supply Sense Threshold Controller Maximum Peak Current Current vs Input Voltage (VIN2) vs Common Mode Voltage Sense Threshold vs ITH Voltage
3.0 90 90 DUTY CYCLE RANGE: 0% TO 100% 80 80 2.5 70 70 60 2.0 60 50 50 (mV) 40 1.5 40 30 Y CURRENT (mA) SENSE THRESHOLD (mV) V 20 1.0 30 SUPPL SENSE 10 V 20 0.5 0 10 –10 0 0 –20 4 8 12 16 20 24 28 32 36 40 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 INPUT VOLTAGE (V) V V SENSE COMMON MODE VOLTAGE (V) ITH (V) 3852 G12 3852 G14 3852 G15
Controller Burst Mode Peak Controller Maximum Current Current Sense Threshold Controller Maximum Current Sense Threshold vs Feedback vs ITH Voltage Sense Threshold vs Duty Cycle Voltage (Current Foldback)
60 90 90 MAXIMUM 80 80 50 70 70 40 60 (mV) 60 (mV) 50 SENSE 50 30 40 40 SENSEV 20 30 30 MINIMUM MAXIMUM V 20 20 10 BURST COMPARATOR FALLING THRESHOLD: CURRENT SENSE THRESHOLD (mV) 10 10 VITH = 0.4V 0 0 0 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 0 20 40 60 80 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 VITH (V) DUTY CYCLE (%) FEEDBACK VOLTAGE (V) 3852 G16 3852 G17 3852 G18
Controller TRACK/SS Pull-Up Controller Shutdown (RUN) Controller Regulated Feedback Current vs Temperature Threshold vs Temperature Voltage vs Temperature
1.5 1.4 806 1.4 1.3 1.3 804 RUN RISING THRESHOLD (ON) 1.2 802 1.1 1.2 1.0 RUN FALLING THRESHOLD (OFF) 800 0.9 1.1 0.8 798 RUN PIN VOLTAGE (V) TRACK/SS CURRENT (μA) 0.7 1.0 796 0.6 REGULATED FEEDBACK VOLTAGE (mV) 0.5 0.9 794 –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) 3852 G19 3852 G20 3852 G21 3852f 6