PDF SCT2001 Data sheet ( Hoja de datos )

Número de pieza	SCT2001
Descripción	3-Channel Constant Constant Driver
Fabricantes	StarChips
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No Preview Available ! StarChips Technology SCT2001 V02_03; May/13 3-Channel Constant Current Driver Product Description The SCT2001 is designed to drive multiple LEDs in series from a high input voltage rail. The SCT2001 contains three output channels which are regulated to sink constant current for driving LEDs of large range VF variations. In the field of LEDs driving applications, users can simply adjust the output current from 10 mA to 45 mA through an external resistor RADJ to control the light intensity of LEDs. The SCT2001 guarantees to endure maximum DC 24V at each output port. Features Three constant,current outputs rate at 24V Constant current range:10 – 45mA Wide operating operation by adding resistor from high rail to supply input ±2%(typ) current matching between outputs ±4%(typ) current matching between ICs Smart dimming control via ADJ pin Low drop,out output 0.3V@20mA Excellent current regulation to load, supply voltage and temperature All output current are adjusted through one external resistor Hysteresis input for ADJ external resistor Built,in power on reset and thermal protection function Package: Small 2mmx2mm DFN and SOT,236 Applications: Mini light bar, LED backlight, LED lamp Pin Configurations ADJ GND VDD 1 2 3 6 OUT0 5 OUT1 4 OUT2 SOT 236 VDD ADJ OUT0 1 2 3 6 OUT2 5 OUT1 4 GND DFN6 Page 1 of 13 1 page 3-Channel Constant Current Driver SCT2001 Switching Characteristics (VDD=5,15V, R1=2K, TA=25°C unless otherwise noted) Characteristic Propagation delay time (“L” to “H”) VADJ – VOUTn Propagation delay time (“H” to “L”) Pulse width Output rise time of IOUT VADJ , VOUTn VADJ Output fall time of IOUT Symbol tPLH tPHL tw tOR tOF Conditions VLED = 5V VIH = 5V VIL= GND VADJ= 5V RADJ = 4.8KS R1 = 2KS C1 = 1uF RL = 180S CL = 10pF CLED = 47uF Min. Typ. Max. , 200 400 , 200 400 2, , , 200 400 , 200 400 Unit ns ns us ns ns Test Circuit for Switching Characteristics VIH VIL tR = tF = 10 ns VDD R1 IDD VLED C1 VDD OUT0 IOUT VADJ RADJ IADJ OUT1 SCT2001 CL ADJ OUT2 RL GND VOUT CLED Timing Waveform *Please add R1 during operation. VADJ VOUTn 50% tW tPHL 90% 50% 10% tOF 50% tPLH 50% 10% 90% tOR Page 5 of 13 5 Page 3-Channel Constant Current Driver PCB Design Considerations Use the following general guide,line when designing printed circuit boards (PCB) : SCT2001 Decoupling Capacitor Place a decoupling capacitor C1 e.g. 1uF between VDD and GND pins of the SCT2001. Locate the capacitor as close to the SCT2001 as possible. The necessary capacitance depends on the LED load current and dimming frequency. Inadequate VDD decoupling can cause timing problems, and very noisy LED supplies can affect LED current regulation. VDD R1 VLED PWM RADJ VDD dimming signal ADJ C1 SCT2001 SCT2001 CLED Power and Ground Maximizing the width and minimizing the length of VDD and GND trace improves efficiency and ground bouncing by effect of reducing both power and ground parasitic resistance and inductance. An adaptive value of resistor R1 in power input of the SCT2001 in conjunction with decoupling capacitor shunting the IC is required. Separating and feeding the LED power from another stable supply terminal VLED, furthermore adding a capacitor CLED greater than 10uF beside the LED are recommended. Please adapt CLED according to total system current consumption. Page 11 of 13 11 Page

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