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FAN5640 데이터시트(PDF) 4 Page - Fairchild Semiconductor |
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FAN5640 데이터시트(HTML) 4 Page - Fairchild Semiconductor |
4 / 11 page © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN5640 • Rev. 1.0.2 4 Electrical Characteristics VIN = 6V to 20V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C, VIN = 14V, ILED = 15mA. Symbol Parameter Condition Min. Typ. Max. Unit Power Supplies VIN Input Voltage Range 6 20 V IQ Quiescent Current Measured at GND pin, VIN = 20V 48 65 µA Measured at GND pin, VIN = 6V 44 55 ISD Shutdown Supply Current VIN = 20V, EN = GND 8 13 µA VIN = 6V, EN = GND 5 8 VEN Enable High-Level Input Voltage 1.2 V Enable Low-Level Input Voltage 0.4 IEN Enable Input Current EN = 5V 9 15 µA EN=GND 0.1 1.0 Regulation ILIM1 Channel 1 Current Limit (2) 30 mA ILIM2 Channel 2 Current Limit (2) 30 mA ∆IOUT Output Current Accuracy 2.5mA < IOUT ≤ 5mA (3) -15 +15 % 5mA < IOUT ≤ 25mA (3) -10 +10 IMATCH Channel-to-Channel Current Matching (4) -3 +3 % VDO Output Dropout Voltage VIN – VOUT at 90% IOUT Programmed IOUT = 25mA 1.80 2.50 V VIN – VOUT at 90% IOUT Programmed IOUT = 2.5mA 0.43 0.60 VREF Reference Voltage 475 mV IMIRROR Current Mirror Ratio IOUT / IRSET 275 ∆IOUT/∆VIN Power Supply Current Dependency VOUT = VIN – 2V (5) 0.5 2.0 %/V TON Turn-On Time VIN=14V , IOUT=12.5mA (6) 5 8 µs TSD Thermal Shutdown Protection Rising Temperature 150 °C Hysteresis 20 Notes: 2. If only one channel is needed, IOUT1 can be tied to IOUT2 to boost maximum current to 50mA. 3. REXT resistor tolerance adds to the specification limit of the pin RSET to determine overall current accuracy. 4. Matching defined as [(IOUT1-IOUT2)/(IOUT1+IOUT2)]×100. 5. VOUT is the total voltage drop across the LED string. 6. Measured from EN crossing 1.8V to output current reaching 90% of target IOUT. |
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