Datasheet LT3478, LT3478-1 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 4.5A Monolithic LED Drivers with True Color PWM Dimming |
| Pages / Page | 24 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS. N Pin (Hysteresis) Current vs. VREF … |
| File Format / Size | PDF / 295 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. N Pin (Hysteresis) Current vs. VREF vs Temperature. N Threshold vs Temperature
Model Line for this Datasheet
Text Version of Document
LT3478/LT3478-1
W U TYPICAL PERFOR A CE CHARACTERISTICS
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N Pin (Hysteresis) Current vs VREF vs Temperature
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N Threshold vs Temperature Temperature
1.28 1.60 15 1.26 JUST BEFORE PART TURNS ON 1.50 µA) 10 1.24 (V) 1.40 REFV SHDN (V) 1.22 5 1.30 SHDN PIN CURRENT ( 1.20 AFTER PART TURNS ON 1.18 1.20 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 JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) 3478 G07 3478 G08 3478 G09
VIN Shutdown Current vs VIN Quiescent Current vs Temperature VIN Quiescent Current vs VIN Temperature
50 14 14 SHDN = 0V 12 12 40 10 10 µA) 30 8 8 V 6 6 CURRENT ( 20 IN = 36V CURRENT (mA) CURRENT (mA) IN IN IN V V V V IN = 20V 4 4 10 2 2 VIN = 2.8V T V A= 25°C IN = 2.8V V V C = 0V C = 0V 0 0 0 –50 –25 0 25 50 75 100 125 0 3 6 9 12 15 18 21 24 27 30 33 36 –50 –25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) V JUNCTION TEMPERATURE ( IN (V) °C) 3478 G10 3478 G11 3478 G12
VS, L, SW Shutdown Currents vs Switch Peak Current Limit Temperature vs Duty Cycle
4 7 SHDN = 0V VS = L = SW = 36V 6 5 µA) 4 2 3 I(VS PIN) = I(L PIN) PIN CURRENT ( 2 SWITCH PEAK CURRENT LIMIT (A) 1 I(SW PIN) TA= 25°C 0 0 –50 –25 0 25 50 75 100 125 0 20 40 60 80 100 JUNCTION TEMPERATURE (°C) DUTY CYCLE (%) 3478 G19 3478 G18 34781f 5
W U TYPICAL PERFOR A CE CHARACTERISTICS
⎯
S
⎯
H
⎯
D
⎯
N Pin (Hysteresis) Current vs VREF vs Temperature
⎯
S
⎯
H
⎯
D
⎯
N Threshold vs Temperature Temperature
1.28 1.60 15 1.26 JUST BEFORE PART TURNS ON 1.50 µA) 10 1.24 (V) 1.40 REFV SHDN (V) 1.22 5 1.30 SHDN PIN CURRENT ( 1.20 AFTER PART TURNS ON 1.18 1.20 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 JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) 3478 G07 3478 G08 3478 G09
VIN Shutdown Current vs VIN Quiescent Current vs Temperature VIN Quiescent Current vs VIN Temperature
50 14 14 SHDN = 0V 12 12 40 10 10 µA) 30 8 8 V 6 6 CURRENT ( 20 IN = 36V CURRENT (mA) CURRENT (mA) IN IN IN V V V V IN = 20V 4 4 10 2 2 VIN = 2.8V T V A= 25°C IN = 2.8V V V C = 0V C = 0V 0 0 0 –50 –25 0 25 50 75 100 125 0 3 6 9 12 15 18 21 24 27 30 33 36 –50 –25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) V JUNCTION TEMPERATURE ( IN (V) °C) 3478 G10 3478 G11 3478 G12
VS, L, SW Shutdown Currents vs Switch Peak Current Limit Temperature vs Duty Cycle
4 7 SHDN = 0V VS = L = SW = 36V 6 5 µA) 4 2 3 I(VS PIN) = I(L PIN) PIN CURRENT ( 2 SWITCH PEAK CURRENT LIMIT (A) 1 I(SW PIN) TA= 25°C 0 0 –50 –25 0 25 50 75 100 125 0 20 40 60 80 100 JUNCTION TEMPERATURE (°C) DUTY CYCLE (%) 3478 G19 3478 G18 34781f 5
