+ RT7320 High Voltage Programmable Constant-Current LED Driver General Description Features zz z zz Programmable Regulated Current : 2.8mA to The RT7320 is a simple and robust constant-current 78.3mA regulator designed to provide a cost-effective solution for zz z zz AC Input Voltage : 90 to 130V or 200 to 240V RMS RMS driving high-voltage LEDs in LED lamp applications. The zz z zz Thermal Regulation Protection wide input voltage range (up to 400V) allows flexible LED zz z zz Minimized Start-up Time (<10ms) string design to operate with 110V or 220V AC input RMS RMS zz z zz Easy EMI Solution voltage. zz z zz Minimized BOM Cost and Space Required The RT7320 allows users to set the regulated current level zz z zz Small SOP-8 (Exposed Pad) Package by connecting the pins from I1 to I5 for various LED lamps. zz z zz RoHS Compliant and Halogen Free Parallel LED strings operation is possible with right regulated current setting on the RT7320. In addition, the Applications RT7320 also provides a thermal regulation protection, z High-Voltage LED Lamps instead of traditional thermal shutdown, to suppress the z High-Voltage Sinking Current Regulator rise of IC junction temperature and prevent LED lamps from flicker. Marking Information RT7320GSP : Product Number Ordering Information RT7320 YMDNN : Date Code RT7320 GSPYMDNN Package Type SP : SOP-8 (Exposed Pad-Option 2) Pin Configurations Lead Plating System G : Green (Halogen Free and Pb Free) (TOP VIEW) Note : 8 Richtek products are : OUT I5 2 7 I4 NC RoHS compliant and compatible with the current require- GND 3 6 GND I3 ments of IPC/JEDEC J-STD-020. 9 4 5 I1 I2 Suitable for use in SnPb or Pb-free soldering processes. SOP-8 (Exposed Pad) Simplified Application Circuit C1 AC RT7320 I5 OUT I4 GND I3 I2 I1 Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. DS7320-00 September 2013 www.richtek.com 1RT7320 Functional Pin Description Pin No. Pin Name Pin Function Output of the Constant-Current Regulator. A programmable regulated current, 1 OUT flowing into this pin, drives high-voltage LEDs connected between this pin and the rectified voltage. 2 NC No Internal Connection. 3, Ground. The exposed pad must be soldered to a large PCB and connected to GND 9 (Exposed Pad) GND for maximum power dissipation. Current Setting Input. If this pin is directly connected to GND, the regulated 4 I1 current increases 2.8mA (typical). Current Setting Input. If this pin is directly connected to GND, the regulated 5 I2 current increases 5.5mA (typical). Current Setting Input. If this pin is directly connected to GND, the regulated 6 I3 current increases 10mA (typical). Current Setting Input. If this pin is directly connected to GND, the regulated 7 I4 current increases 20mA (typical). Current Setting Input. If this pin is directly connected to GND, the regulated 8 I5 current increases 40mA (typical). Function Block Diagram Voltage Regulator OUT + M1 Thermal V - REF Regulation Error Protection Amplifier GND R1 = 16R R2 = 8R R3 = 4R R4 = 2R R5 = R I I I I I 1 2 3 4 5 2.8mA 5.5mA 10mA 20mA 40mA I1 I2 I3 I4 I5 Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. www.richtek.com DS7320-00 September 2013 2