XR46010 Active Load Current Regulator for Phase-Cut Dimmable AC Direct Drive LED Lamp Description FEATURES The XR46010 is an active load current regulator for phase-cut 3V to 80V input operation range dimmable AC direct drive LED lamp system. The active load circuit 250mV low current sense voltage Linear over temperature protection can provide the holding current for TRIAC and also the charging current path of R/C circuit in a dimmer. It can help to stabilize TRIAC APPLICATIONS operation and increase the dimming range of the lamp system. LED Lighting Applications The application of the XR46010 is configured in parallel with an Downlight High bay LED string. It conducts the current when the LED string is in off state, Specialty and stops conducting the current when the LED string is in on state. Architectural The active load circuit can be placed in the same board with the LED string or a separate board in front of the LED board. The design is very flexible to meet various shape requirements. Typical Application ACTIVE LOAD + 100-120V AC LEDS1 XR46010 IN BD U0 CS MDB10S GND RS0 0805 R IN1 LEDS2 R A1 U1 XR46084 R IN2 R1 R A2 Q1 XR46000 VIN GATE VL U2 SOURCE XR46073 LEDS3 GND CS R C B LR R2 Figure 1. Typical Application REV1C 1/8 K A MS2 NC MS1 CSXR46010 Absolute Maximum Ratings Operating Conditions Stresses beyond the limits listed below may cause Regulating current, I ................................................60mA IN permanent damage to the device. Exposure to any Absolute (1) Input voltage, V ...............................................4V to 80V IN Maximum Rating condition for extended periods may affect Junction temperature range, T ................... -40C to 150C J device reliability and lifetime. NOTE: Sustaining voltage, IN ...................................... -0.3V to 88V 1. Operating free-air temperature range. Sustaining voltage, CS ...................................... -0.3V to 5V Regulating current ......................................................75mA Maximum junction temperature, T ............................ 165C J Storage temperature range ......................... -55C to 150C Lead temperature (soldering, 10 seconds) ................ 260C ESD Rating HBM - human body model ........................................... 2kV MM - machine model .................................................200V NOTES: All voltages are with respect to ground. Currents are positive into negative out of the specified terminal. All parameters having min/max specifications are guaranteed. Typical values are for reference purpose only. Unless otherwise noted, all tests are pulsed tests at the specified temperature, therefore: T = T = T . J C A Electrical Characteristics Unless otherwise noted, typical values are at T = 25C. A Symbol Parameter Conditions Min Typ Max Units V CS pin reference voltage V = 5V 225 250 275 mV CS IN (1) V Dropout voltage IN to GND 3 4 V DROP CS pin reference voltage V /V V = 5V and 40V, R = 50 1 2 % LR CS (2) IN CS line regulation When T is higher than T , the J TP (3)(4) T Thermal protection trip temperature 110 125 C TP V decreases to V linearly CS CS,OTP Thermal protection mode V decreasing CS V /T T > T -1.1 %/C CS J J TP (2) slope NOTES: 1. Dropout voltage = V at (I = 90% (I at V = 5V)). V - V IN LED LED IN V CS (V = 40V) CS (V = 5V) LR IN IN = 2. The CS pin reference voltage line regulation is defined as: . V V CS CS (V = 5V) 3. Guarantee by design, not by production test. IN 4. When T > T , the V decreases linearly to around 50% at 170C. J TP CS V CS -1.1%/C 100% 50% 0% T J 125C 170C T TP Figure 2. V vs. T CS J REV1C 2/8