Datasheet LT1952, LT1952-1 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | Single Switch Synchronous Forward Controller |
| Pages / Page | 28 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. COMP Source Current. COMP Sink … |
| File Format / Size | PDF / 371 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. COMP Source Current. COMP Sink Current. (Disabled) COMP Pin Current. vs Temperature
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Text Version of Document
LT1952/LT1952-1
TYPICAL PERFORMANCE CHARACTERISTICS COMP Source Current COMP Sink Current (Disabled) COMP Pin Current vs Temperature vs Temperature vs Temperature
12.5 12.5 50 FB = 1V FB = 1.4V FB = VREF COMP = 1.6V COMP = 1.6V COMP = 1.6V 40 10.0 10.0 30 20 7.5 7.5 CURRENT OUT OF PIN COMP SINK CURRENT (mA) COMP PIN CURRENT (µA) 10 COMP SOURCE CURRENT (mA) • (–1) 5.0 5.0 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) 1952 G10 1952 G11 1952 G12
ISENSE Maximum Threshold ISENSE Maximum Threshold ISENSE Pin Current (Out of Pin) vs COMP vs Temperature vs Duty Cycle
240 240 40 TA = 25°C COMP = 2.5V TA = 25°C RISENSE = 0k RISENSE = 0k 200 230 30 160 120 220 OC THRESHOLD 20 PIN CURRENT (µA) MAX THRESHOLD (mV) 80 MAX THRESHOLD (mV) 210 I SENSE 10 I SENSE I SENSE 40 0 200 0 0 0.5 1.0 1.5 2.0 2.5 3.0 –50 –25 0 25 50 75 100 125 0 10 20 30 40 50 60 70 80 90 100 COMP (V) TEMPERATURE (°C) DUTY CYCLE (%) 1952 G13 1952 G14 1952 G15
ISENSE Maximum Threshold vs Duty Cycle (Programming OC (Overcurrent) Threshold Slope Compensation) vs Temperature Blank Duration vs Temperature
225 120 800 PRECISION OVERCURRENT THRESHOLD INDEPENDENT OF DUTY CYCLE R 215 SLOPE = 0W 110 600 RBLANK = 120k 205 RSLOPE = 470W 100 400 195 MAX THRESHOLD (mV) OC THRESHOLD (mV) 90 BLANK DURATION (ns) 200 I SENSE 185 R R SLOPE = 1k BLANK = 40k TA = 25°C COMP = 2.5V 175 80 0 0 10 20 30 40 50 60 70 80 90 100 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 DUTY CYCLE (%) TEMPERATURE (°C) TEMPERATURE (°C) 1952 G16 1952 G17 1952 G18 19521fe 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Timing Diagram Block Diagram Operation Applications Information Typical Applications Revision History Package Description Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS COMP Source Current COMP Sink Current (Disabled) COMP Pin Current vs Temperature vs Temperature vs Temperature
12.5 12.5 50 FB = 1V FB = 1.4V FB = VREF COMP = 1.6V COMP = 1.6V COMP = 1.6V 40 10.0 10.0 30 20 7.5 7.5 CURRENT OUT OF PIN COMP SINK CURRENT (mA) COMP PIN CURRENT (µA) 10 COMP SOURCE CURRENT (mA) • (–1) 5.0 5.0 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) 1952 G10 1952 G11 1952 G12
ISENSE Maximum Threshold ISENSE Maximum Threshold ISENSE Pin Current (Out of Pin) vs COMP vs Temperature vs Duty Cycle
240 240 40 TA = 25°C COMP = 2.5V TA = 25°C RISENSE = 0k RISENSE = 0k 200 230 30 160 120 220 OC THRESHOLD 20 PIN CURRENT (µA) MAX THRESHOLD (mV) 80 MAX THRESHOLD (mV) 210 I SENSE 10 I SENSE I SENSE 40 0 200 0 0 0.5 1.0 1.5 2.0 2.5 3.0 –50 –25 0 25 50 75 100 125 0 10 20 30 40 50 60 70 80 90 100 COMP (V) TEMPERATURE (°C) DUTY CYCLE (%) 1952 G13 1952 G14 1952 G15
ISENSE Maximum Threshold vs Duty Cycle (Programming OC (Overcurrent) Threshold Slope Compensation) vs Temperature Blank Duration vs Temperature
225 120 800 PRECISION OVERCURRENT THRESHOLD INDEPENDENT OF DUTY CYCLE R 215 SLOPE = 0W 110 600 RBLANK = 120k 205 RSLOPE = 470W 100 400 195 MAX THRESHOLD (mV) OC THRESHOLD (mV) 90 BLANK DURATION (ns) 200 I SENSE 185 R R SLOPE = 1k BLANK = 40k TA = 25°C COMP = 2.5V 175 80 0 0 10 20 30 40 50 60 70 80 90 100 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 DUTY CYCLE (%) TEMPERATURE (°C) TEMPERATURE (°C) 1952 G16 1952 G17 1952 G18 19521fe 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Timing Diagram Block Diagram Operation Applications Information Typical Applications Revision History Package Description Related Parts
