Datasheet LT1070, LT1071 (Linear Technology) - 4
| Manufacturer | Linear Technology |
| Description | 5A and 2.5A High Efficiency Switching Regulators |
| Pages / Page | 12 / 4 — TYPICAL PERFORMANCE CHARACTERISTICS. Switch Current Limit vs Duty Cycle. … |
| Revision | E |
| File Format / Size | PDF / 218 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Switch Current Limit vs Duty Cycle. Maximum Duty Cycle. Flyback Blanking Time
Model Line for this Datasheet
Text Version of Document
LT1070/LT1071
W U TYPICAL PERFORMANCE CHARACTERISTICS Switch Current Limit vs Duty Cycle Maximum Duty Cycle Flyback Blanking Time
16 96 2.2 FOR LT1071, DIVIDE 14 VERTICAL SCALE BY 2 95 2.0 12 94 1.8 10 – 55°C 25°C µs) 8 93 1.6 TIME ( 6 125°C DUTY CYCLE (%) 92 1.4 SWITCH CURRENT (A) 4 91 1.2 2 0 90 1.0 0 10 20 30 40 50 60 70 80 90 100 –75 – 50 – 25 0 25 50 75 100 125 150 –75 – 50 – 25 0 25 50 75 100 125 150 DUTY CYCLE (%) JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) 1070/71 G01 1070/71 G02 1070/71 G03
Minimum Input Voltage Switch Saturation Voltage
2.9 1.6 23 FOR LT1071, DIVIDE SWITCH CURRENT = 5A 1.4 CURRENT BY 2 22 2.8 150°C 1.2 21 RFEEDBACK = 500Ω 2.7 100°C 1.0 20 25°C 2.6 0.8 19 RFEEDBACK = 1k SWITCH CURRENT = 0A – 55°C 0.6 18 2.5 FLYBACK VOLTAGE (V) 0.4 17 RFEEDBACK = 10k MINIMUM INPUT VOLTAGE (V) 2.4 SWITCH SATURATION VOLTAGE (V) 0.2 16 2.3 0 15 –75 – 50 – 25 0 25 50 75 100 125 150 0 1 2 3 4 5 6 7 8 – 75 – 50 – 25 0 25 50 75 100 125 150 TEMPERATURE (°C) SWITCH CURRENT (A) TEMPERATURE (°C) 1070/71 G05 1070/71 G04 1070/71 G06
Reference Voltage Feedback Bias Current Line Regulation vs Temperature vs Temperature
5 1.250 42 800 4 1.248 41 700 SWITCHING SWITCHING FREQUENCY (kHz) 3 TJ = 150°C FREQUENCY 1.246 40 600 2 TJ = 25°C 1.244 39 500 1 REFERENCE 0 T 1.242 38 400 J = – 55°C V0LTAGE –1 1.240 37 300 – 2 REFERENCE VOLTAGE (V) 1.238 36 200 – 3 FEEDBACK BIAS CURRENT (nA) REFERENCE VOLTAGE CHANGE (mV) 1.236 35 100 – 4 – 5 1.234 34 0 0 10 20 30 40 50 60 – 75 – 50 – 25 0 25 50 75 100 125 150 – 75 – 50 – 25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 1070/71 G08 1070/71 G07 1070/71 G09 10701fe 4
W U TYPICAL PERFORMANCE CHARACTERISTICS Switch Current Limit vs Duty Cycle Maximum Duty Cycle Flyback Blanking Time
16 96 2.2 FOR LT1071, DIVIDE 14 VERTICAL SCALE BY 2 95 2.0 12 94 1.8 10 – 55°C 25°C µs) 8 93 1.6 TIME ( 6 125°C DUTY CYCLE (%) 92 1.4 SWITCH CURRENT (A) 4 91 1.2 2 0 90 1.0 0 10 20 30 40 50 60 70 80 90 100 –75 – 50 – 25 0 25 50 75 100 125 150 –75 – 50 – 25 0 25 50 75 100 125 150 DUTY CYCLE (%) JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) 1070/71 G01 1070/71 G02 1070/71 G03
Minimum Input Voltage Switch Saturation Voltage
2.9 1.6 23 FOR LT1071, DIVIDE SWITCH CURRENT = 5A 1.4 CURRENT BY 2 22 2.8 150°C 1.2 21 RFEEDBACK = 500Ω 2.7 100°C 1.0 20 25°C 2.6 0.8 19 RFEEDBACK = 1k SWITCH CURRENT = 0A – 55°C 0.6 18 2.5 FLYBACK VOLTAGE (V) 0.4 17 RFEEDBACK = 10k MINIMUM INPUT VOLTAGE (V) 2.4 SWITCH SATURATION VOLTAGE (V) 0.2 16 2.3 0 15 –75 – 50 – 25 0 25 50 75 100 125 150 0 1 2 3 4 5 6 7 8 – 75 – 50 – 25 0 25 50 75 100 125 150 TEMPERATURE (°C) SWITCH CURRENT (A) TEMPERATURE (°C) 1070/71 G05 1070/71 G04 1070/71 G06
Reference Voltage Feedback Bias Current Line Regulation vs Temperature vs Temperature
5 1.250 42 800 4 1.248 41 700 SWITCHING SWITCHING FREQUENCY (kHz) 3 TJ = 150°C FREQUENCY 1.246 40 600 2 TJ = 25°C 1.244 39 500 1 REFERENCE 0 T 1.242 38 400 J = – 55°C V0LTAGE –1 1.240 37 300 – 2 REFERENCE VOLTAGE (V) 1.238 36 200 – 3 FEEDBACK BIAS CURRENT (nA) REFERENCE VOLTAGE CHANGE (mV) 1.236 35 100 – 4 – 5 1.234 34 0 0 10 20 30 40 50 60 – 75 – 50 – 25 0 25 50 75 100 125 150 – 75 – 50 – 25 0 25 50 75 100 125 150 INPUT VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 1070/71 G08 1070/71 G07 1070/71 G09 10701fe 4
