CL88030/31 Sequential Linear LED Driver with Four or Six Taps Features Description Suitable for 120VAC/230VAC/277VAC Nominal The CL88030T and CL88031T LED Driver Integrated Input Voltage Circuits (ICs) are intended offline sequential linear LED drivers designed to provide LED power from a utility - 15% input voltage tolerance recommended voltage input. Targeted for 2W and Greater Output Power The CL88030/31 devices are designed to drive a long Programmable Overtemperature Protection string of inexpensive, low-current LEDs directly from - Provides gradual reduction in light output with the AC mains. A basic driver circuit consists of Micro- increasing temperature chips CL88030/31 LED driver IC, four power FETs (six Active Line Regulation if using the CL88031), four resistors, two capacitors, - Provides fairly constant output power over and a bridge rectifier. Additional components are variations in AC line voltage optional for various levels of transient protection. Add- - Adjustable knee of regulation ing an inexpensive NTC-thermistor assures over tem- perature protection (OTP). No EMI filters or power 4 Taps(CL88030) or 6 Taps(CL88031) with Two factor correction circuits are needed (unless the Current Set Resistors optional flicker-reduction feature is desired). - Allows optimization of THD Optional Reduced Flicker Index A string of series/parallel LEDs is tapped at four (or six) locations, called taps. Linear current regulators sink - Provides near-continuous power to the LEDs current at each tap through a single control point and - Reduces strobing are sequentially turned on and off. High efficiency is - Uses an external capacitor achieved by shutting off upstream regulators when Compatible with Phase-cut Dimming, both Lead- downstream regulators achieve regulation. This makes ing-edge and Trailing-edge controlling overall input current easier than trying to Uses a Thermally Enhanced DFN-10 Package control multiple current paths by tracking the input sine with Bottom Heatslug wave voltage. - No high voltage Pins The CL88030/31 uses a self-commutation technique - Shunt regulator input using only the tap currents themselves this technique inherently provides smooth transitions from one - Power dissipation is in the external FETs and regulator to the next, without relying on tap voltages or LEDs, not in the IC the rectified AC to coordinate the transitions. Applications LED lamps LED lighting fixtures Pin Diagram CL88030T CL88031T 3x3 DFN* 3x 3DFN* GT1 ALR GT1 ALR 1 1 10 10 GT2 2 9 BIAS GT2 2 9 BIAS EP EP GT3 3 8 OTP GT3 3 8 OTP 11 11 4 7 CS 4 7 CS GT4 GT4 6 6 NC 5 NC GT5 5 GT6 * Includes Exposed Thermal Pad (EP) see Table 2-1 2018 Microchip Technology Inc. DS20006049A-page 1CL88030/31 TYPICAL CL88030T APPLICATION CIRCUIT 5 %5 029 5 5 5 *7 *7 *7 *7 5 & 273 *1 & 5 5 &6 5 5 17& CL88030 INTERNAL BLOCK DIAGRAM *7 *7 *7 *7 9 %, 6 9 ) 5( . 7 3 >Z 5 5 6 ) N N . 7 3 WKd 9 %, 6 . 7 3 5 28 9 /,0 N 5 2) 5 2/ N N *1 DS20006049A-page 2 2018 Microchip Technology Inc. &6 %, 6 2: 27 %, 6 &6 %, 6 &/ /5 /5 /5 /5 %, 6 73 73