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CAT4137 Datasheet(PDF) 3 Page - ON Semiconductor |
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CAT4137 Datasheet(HTML) 3 Page - ON Semiconductor |
3 / 15 page CAT4137 http://onsemi.com 3 Table 3. ELECTRICAL OPERATING CHARACTERISTICS (VIN = 3.6 V, ambient temperature of 25°C (over recommended operating conditions unless otherwise specified)) Symbol Parameter Conditions Min Typ Max Unit IQ Operating Current VFB = 0.3 V VFB = 0.4 V (not switching) 0.4 0.1 1.5 0.3 mA ISD Shutdown Current VSHDN = 0 V 0.1 1 mA VFB FB Pin Voltage 3 LEDs with ILED = 20 mA 285 300 315 mV IFB FB pin input leakage 0.1 1 mA ILED Programmed LED Current R1 = 10 W R1 = 15 W R1 = 20 W 28.5 19 14.25 30 20 15 31.5 21 15.75 mA VIH VIL SHDN Logic High SHDN Logic Low Enable Threshold Level Shutdown Threshold Level 0.4 0.8 0.7 1.5 V FSW Switching Frequency 0.7 1.0 1.3 MHz ILIM Switch Current Limit 250 300 400 mA RSW Switch “On” Resistance ISW = 100 mA 1.0 2.0 W ILEAK Switch Leakage Current Switch Off, VSW = 5 V 1 5 mA TSD Thermal Shutdown 150 °C THYS Thermal Hysteresis 20 °C h Efficiency Typical Application Circuit 86 % VUVLO Undervoltage Lockout (UVLO) Threshold 1.9 V VOV-SW Output Clamp Voltage “Open LED” fault 29 V |
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