Datasheet LT3478, LT3478-1 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | 4.5A Monolithic LED Drivers with True Color PWM Dimming |
| Seiten / Seite | 24 / 6 — TYPICAL PERFOR A CE CHARACTERISTICS. Switching Frequency vs. Open-Circuit … |
| Dateiformat / Größe | PDF / 295 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFOR A CE CHARACTERISTICS. Switching Frequency vs. Open-Circuit Output Clamp. Switching Frequency vs RT. Temperature
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LT3478/LT3478-1
W U TYPICAL PERFOR A CE CHARACTERISTICS Switching Frequency vs Open-Circuit Output Clamp Switching Frequency vs RT Temperature Voltage vs Temperature
10000 1.20 43.0 T R OVPSET = 1V A = 25°C T = 31.6k 1.15 42.5 1.10 42.0 1.05 41.5 1000 1.00 41.0 CLAMP (V) 0.95 OUT 40.5 V 0.90 40.0 SWITCHING FREQUENCY (kHz) SWITCHING FREQUENCY (MHz) 0.85 39.5 0.80 39.0 100 1 10 100 1000 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 R JUNCTION TEMPERATURE ( T (kΩ) °C) JUNCTION TEMPERATURE (°C) 3478 G13 3478 G14 3478 G15
SS Pin Charge Current vs VC Pin Active and Clamp Voltages Temperature vs Temperature
14 1.8 1.5 VC CLAMP 13 1.2 µA) (OUT OF PIN) 12 (V) C 0.9 V 0.6 V 11 C ACTIVE THRESHOLD 0.3 SS PIN CURRENT ( 10 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) 3478 G16 3478 G17 34781f 6
W U TYPICAL PERFOR A CE CHARACTERISTICS Switching Frequency vs Open-Circuit Output Clamp Switching Frequency vs RT Temperature Voltage vs Temperature
10000 1.20 43.0 T R OVPSET = 1V A = 25°C T = 31.6k 1.15 42.5 1.10 42.0 1.05 41.5 1000 1.00 41.0 CLAMP (V) 0.95 OUT 40.5 V 0.90 40.0 SWITCHING FREQUENCY (kHz) SWITCHING FREQUENCY (MHz) 0.85 39.5 0.80 39.0 100 1 10 100 1000 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 R JUNCTION TEMPERATURE ( T (kΩ) °C) JUNCTION TEMPERATURE (°C) 3478 G13 3478 G14 3478 G15
SS Pin Charge Current vs VC Pin Active and Clamp Voltages Temperature vs Temperature
14 1.8 1.5 VC CLAMP 13 1.2 µA) (OUT OF PIN) 12 (V) C 0.9 V 0.6 V 11 C ACTIVE THRESHOLD 0.3 SS PIN CURRENT ( 10 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) 3478 G16 3478 G17 34781f 6