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FAN5616 데이터시트(PDF) 5 Page - Fairchild Semiconductor |
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FAN5616 데이터시트(HTML) 5 Page - Fairchild Semiconductor |
5 / 14 page 5 www.fairchildsemi.com FAN5616 Rev. 1.0.0 Electrical Characteristics Unless otherwise noted, VIN = 2.7V to 5.5V, ILED = 2mA to 20mA, EN1 = EN2 = HIGH, TA = -40°C to +85°C. Typical values are at 25°C. Notes: 1. Current Matching refers to the absolute value of the difference in the current between the two LED branches. 2. Efficiency is expressed as a ratio between the electrical power into the LEDs and the total power consumed from the input power supply. Some competitors calculate the efficiency as a function of VOUT instead of LED VF. Their method does not account for the power lost due to the cathode voltage not being equal to zero. This method allows them to provide an “improved” efficiency up to 5%. Parameter Conditions Min Typ Max Unit Input Under-Voltage Lockout VIN falling 1.6 V VIN rising 2.3 ILED/ISET Ratio VIN = 3.6V, IOUT = 15mA 240 255 270 ILED/ISET Ratio ILED = 2 to 20mA 230 260 280 ILED/ISET Ratio EN1 = HIGH, EN2 = LOW 86 EN1 = LOW, EN2 = HIGH 173 Current Matching with Unmatched LEDs (Note 1) 2mA ≤ ILED ≤ 15mA 2.8V ≤ LED VF <4V 0.6 +3 % Reference Voltage for Current Set 588 600 612 mV Start Up time COUT = 1µF, VIN = 3.6V, ILED = 15mA 200 270 500 µS Minimum Cathode Voltage ILED = 15mA 170 250 mV Quiescent Current VIN = 5.5V, IOUT = 5mA 250 µA Shutdown Supply Current EN1 = EN2 = Logic “L” 0.1 1 µA Output Short Circuit Current VIN = 5.5V, VOUT = 0V 65 80 mA VOUT Over-voltage Protection 6 V VIN at Mode Transition from 1x to 1.5x LED Vf = 3.5V, ILED = 3 x 20mA 3.9 V VIN at Mode Transition from 1.5x to 2x LED Vf = 3.5V, ILED = 3 x 20mA 2.9 V Peak Efficiency (Note 2) VIN = 3.75V, LED Vf = 3.4V, ILED = 18mA 90 % Oscillator Frequency 0.8 1 1.2 MHz Thermal Shutdown Threshold 150 °C Thermal Shutdown Hysteresis 15 °C “EN1” Logic Input Low Voltage 0.4 V “EN1” Logic Input High Voltage 1.6 V “EN2” Logic Input Low Voltage 0.4 V “EN2” Logic Input High Voltage 1.6 V ( ( ) ) LEDj LEDi LEDj LEDi I I 100 x I I Current Matching (%) + , where i, j = 1, 2 or 3 – – – – IN IN 3 1 i LEDi LEDi I x V I x V Efficiency = – – – Σ |
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