Alfa-MOS Technology. AF V / 50mA Linear LED Driver

Transcription

1 General Description The is a linear LED driver. The application of high bright LED is widely used for general illumination. The maximum output current is 50mA. Typical variations is % in V IN = 6 ~ 500V input voltage range and -40 ~ 85 temperature range. Ground current is approximately 32µA, from zero to maximum loading conditions at T A =25. Built-in thermal shutdown protection against any fault conditions. The output current can be setting by place a resistor at V CS pin. For ease of application, the comes in the popular 3-pin. Features 6~500V wide input voltage range. Least external component. Typical ground current is 32µA. 2% accuracy V CS voltage. Can be paralleled for higher current Thermal Shutdown Protection. User TRIAC dimming support RoHS Compliant Application LED illumination General illumination Pin Define Marking Information Rev.B July 2011 Page 1

2 Typical Application Circuit VIN GND VCS Pin Description Pin Symbol Description V IN 1 Power Input. Supply voltage can range from 6 to 500V. GND 2 Ground V CS 3 Current sense, current setting by place a resistor connect to GND Ordering Information Part Ordering No. Part Marking Package Unit Quantity S223RG 1880 Tape & Reel 2500 EA T252RG Tape & Reel 2500 EA 1880 parts code YY year code ( 00 ~ 99 ) WW week code ( 00 ~ 52 ) A Lot code B Date code S223RG : Tape Reel ; Pb- Free ; Halogen- Free T252RG : Tube ; Pb- Free ; Halogen- Free Rev.B July 2011 Page 2

3 Block Diagram Absolute Maximum Ratings (TA=25 Unless otherwise noted) The following ratings designate persistent limits beyond which damage to the device may occur. Symbol Parameter Value Unit (1) V IN VDD Pin Voltage V SS to V SS V V CS Vout Pin Voltage V SS to 6 V P D R Power Dissipation Junction tase Thermal Resistance Junction to Ambient Thermal Resistance R T OPR Operating Temperature Range -20 to +85 T STG Storage Temperature Range -40 to +150 Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. Electrical Characteristics (T A =25, V CC =15V, unless otherwise specified.) Symbol Parameter Conditions Min. Typ. Max. Unit V IN Input Voltage V I GND Supply quiescent current V IN =100V, R CS =1M µa V CS Current sense voltage V IN = 6 ~ 500V, R CS = 2.5 ~ 1M V I VR Line Regulation V IN =6 ~ 500V, I LOAD = 20mA 1 5 % I TR Temperature Regulation Temperature from -40 to % T SD Thermal shutdown threshold 160 T HYS Thermal shutdown hysteresis 25 Rev.B July 2011 Page W /W /W

4 Function Description Current setting Current setting by place a resistor between V CS pin and GND, the current as follow: I LED = I GND V + R CS CS 0.25 = 32 u + R CS Thermal Considerations The is designed to provide maximum 50mA of continuous current. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part. The maximum dissipation the package can handle is given by: P D T = J ( MAX ) R θ ( JA) T A The actual power dissipation of the circuit can be determined using the equation: D ( V V )( I I ) P = + IN LED GND LED Substituting PD(MAX) for PD and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the circuit. Rev.B July 2011 Page 4

5 Package Information ( ) 2010 Alfa-MOS Corp. 9F.-15, No.3-2, Yuanqu St., Nangang Dist., (NanKang Software Park), Taipei City 115, Taiwan (R.O.C.) Tel : 886 2) Fax : 886 2) Rev.B July 2011 Page 5

6 Package Information ( ) 2010 Alfa-MOS Corp. 9F.-15, No.3-2, Yuanqu St., Nangang Dist., (NanKang Software Park), Taipei City 115, Taiwan (R.O.C.) Tel : 886 2) Fax : 886 2) Rev.B July 2011 Page 6