AS3691B-ZQFP

AS3691 Datasheet Datasheet AS3691 4 Precision 400mA Current Sources for RGB and Single Color Leds 1 General Description The AS3691 (AS3691A and AS3691B) features four high precision current sources for lighting of up to four LED strings (RGB or single color leds). Each of the four currents sources can be controlled independently by PWM inputs. The full scale current value is set by external resistors. Very wide output voltage current source voltage compliance − Down to 0.41V 2) − Up to 15V Integrated overtemperature protection Separate sense pads (Rfb1-Rfb4) for easy and precise PCB Layout Package − DIE − QFN24 4x4mm − eP-TSSOP 2) 2 Key Features 4 x up to 0.4A constant current outputs Programmable with external resistors 4 independent PWM inputs Absolute current accuracy +/-0.5% ’ Automatic Supply Regulation’ to reduce power dissipation1) 1) 15V is sufficient for most applications as the AS3691 dose not switch off the LED current completely Patent Pending 3 Applications General Lighting Backlighting RGB Backlighting for LCD TV/Monitors with White Color Balancing 4 Application Diagrams Figure 1 – Application Diagram of AS3691 for Single Color Lighting VDD Csup 100nF Rvdd Cvdd 100nF UV VREG UV1 CURR1 UV2 CURR2 UV3 CURR3 UV4 CURR4 UV VDD AS3691 D1 Ref Vc Vc Vc Vc T1 I1 R1 R2 T2 I2 R3 T3 I3 R4 T4 I4 Overtemp Pad VSS ON1 RFB1 RES1 ON2 RFB2 RES2 ON3 RFB3 RES3 ON4 RFB4 RES4 Ri1 VSS PWM Ri2 Ri3 Ri4 VSS PWM www.austriamicrosystems.com (ptr) Revision 2.3 1 - 22 AS3691 Datasheet Figure 2 – Application Diagram of AS3691 for RGB Lighting VDDG VDDB VDDR VDDG VDDB VDDR Rvdd Cvdd 100nF UVG UVB UVR VREG UV1 CURR1 UV2 CURR2 UV3 CURR3 UV4 CURR4 UVG UVB UVR AS3691 D1 Ref Vc Vc Vc Vc T1 I1 R1 R2 T2 I2 R3 T3 I3 R4 T4 I4 Overtemp Pad VSS ON1 RFB1 RES1 ON2 RFB2 RES2 ON3 RFB3 RES3 ON4 RFB4 RES4 Ri1 VSS PWMG PWMB PWMR Ri2 Ri3 Ri4 VSS PWMG PWMB PWMR www.austriamicrosystems.com (ptr) Revision 2.3 2 - 22 AS3691 Datasheet Table of Contents 1 2 3 4 5 General Description ......................................................................................................................................... 1 Key Features.................................................................................................................................................... 1 Applications...................................................................................................................................................... 1 Application Diagrams ....................................................................................................................................... 1 Pinout............................................................................................................................................................... 4 5.1 5.2 6 6.1 6.2 6.3 7 8 Pin Assignments ....................................................................................................................................... 4 Pin Descriptions........................................................................................................................................ 4 Absolute Maximum Ratings ...................................................................................................................... 6 Operating Conditions ................................................................................................................................ 6 Electrical Characteristics........................................................................................................................... 7 Characteristics ................................................................................................................................................. 6 Typical Operation Characteristics .................................................................................................................... 8 Detailed Functional Description ..................................................................................................................... 12 8.1 8.2 8.3 Shunt Regulator...................................................................................................................................... 12 Overtemperature Protection.................................................................................................................... 12 Automatic Supply Regulation.................................................................................................................. 13 9 Application Information .................................................................................................................................. 14 9.1 Design Example...................................................................................................................................... 15 9.1.1 Using Automatic Supply Regulation................................................................................................. 16 9.2 Layout Recommendations ...................................................................................................................... 16 10 10.1 10.2 10.3 11 Package Drawings and Markings ............................................................................................................... 17 QFN 4x4 Package Drawings and Marking .............................................................................................. 17 ePTSSOP Package Drawings and Marking............................................................................................ 19 DIE Delivery............................................................................................................................................ 20 Ordering Information .................................................................................................................................. 21 Revision History Revision 2.3 Date 30.10.2007 Owner ptr Description - Added Trays as delivery option (order code AS3691AZQFT) www.austriamicrosystems.com (ptr) Revision 2.3 3 - 22 AS3691 Datasheet 5 Pinout 5.1 Pin Assignments Figure 3 – Pin Usage VREG UV1 CURR1 UV2 CURR2 UV3 CURR3 UV4 CURR4 AS3691 D1 Ref Vc Vc Vc Vc T1 I1 R1 R2 T2 I2 R3 T3 I3 R4 T4 I4 Overtemp Pad VSS ON1 RFB1 RES1 ON2 RFB2 RES2 ON3 RFB3 RES3 ON4 RFB4 RES4 5.2 Pin Descriptions Table 1 – Pin Type Descriptions Pin Type AI/O AI AO DI S Analog Pin Analog Input Pin Analog Output Pin Digital Input Supply Pin Description Table 2 – Pin Descriptions Pin Number QFN Package 1 2 3 4 5 6 Pin Number ePTSSOP Package 10 11 12 13 14 15 Pin Name CURR1 RFB1 nc RFB4 CURR4 RES4 Type AI/O AI nc AI AI/O AI/O Description Current Source 1 Output Connect to current set resistor R1 directly at resistor itself Leave open Connect to current set resistor R4 directly at resistor itself Current Source 4 Output Connect to current set resistor R4 www.austriamicrosystems.com (ptr) Revision 2.3 4 - 22 AS3691 Datasheet Pin Number QFN Package Pin Number ePTSSOP Package Pin Name Type Description Current source CURR4 control; internal pullup resistor to VREG (can be left open, if CURR4 is always switched on) High … 100% Current Low … 5% Current Automatic supply regulation for CURR4; if not used, leave open Digital Test input; Leave open or connect to VSS; internal pulldown to VSS Automatic supply regulation for CURR3; if not used, leave open Current source CURR3 control; internal pullup resistor to VREG (can be left open, if CURR3 is always switched on) High … 100% Current Low … 5% Current Connect to current set resistor R3 Current Source 3 Output Connect to current set resistor R3 directly at resistor itself Shunt regulator supply; connect to Rvdd and Cvdd Connect to current set resistor R2 directly at resistor itself Current Source 2 Output Connect to current set resistor R2 Current source CURR2 control; internal pullup resistor to VREG (can be left open, if CURR2 is always switched on) High … 100% Current Low … 5% Current Automatic supply regulation for CURR2; if not used, leave open VSS Supply connection Automatic supply regulation for CURR1; if not used, leave open Current source CURR1 control; internal pullup resistor to VREG (can be left open, if CURR1 is always switched on) High … 100% Current Low … 5% Current Connect to current set resistor R1 VSS Supply connection; add as many vias to ground plane as possible 7 16 ON4 DI 8 9 10 17 18 19 UV4 TEST UV3 AO AI AO 11 20 ON3 DI 12 13 14 15 16 17 18 21 22 23 24 1 2 3 RES3 CURR3 RFB3 VREG RFB2 CURR2 RES2 AI/O AI/O AI S AI AI/O AI/O 19 4 ON2 DI 20 21 22 5 6 7 UV2 VSS UV1 AO S AO 23 8 ON1 DI 24 Pad 9 Pad RES1 VSS AI/O S www.austriamicrosystems.com (ptr) Revision 2.3 5 - 22 AS3691 Datasheet 6 Characteristics 6.1 Absolute Maximum Ratings Stresses beyond those listed in Table 1 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in Section 5 Electrical Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 3 – Absolute Maximum Ratings Symbol VDDMAX VINVREG VIN5V VIN15V IIN TSTRG VESD PT PDERATE TBODY Notes: 1. 2. 3. Parameter Supply for LEDs VREG Supply voltage 5V Pins 15V Pins Input Pin Current Storage Temperature Range Humidity Electrostatic Discharge Total Power Dissipation PT Derating Factor Body Temperature during Soldering Min -0.3 -0.3 -0.3 -0.3 -25 -55 5 -2000 Max >17 7.0 VREG+ 0.3V 17 +25 125 85 2000 2.0 23 260 Unit V V V V See notes1 Note Applicable for pin VREG Applicable for 5V pins2 Applicable for CURR1, CURR2, CURR3 and CURR4 mA At 25ºC, Norm: Jedec 17 °C % V W Non condensing Norm: MIL 883 E Method 3015 At 50ºC, no airflow for QFN24 on 3 two layer FR4-Cu PCB mW/ See notes3 °C °C according to IPC/JEDEC J-STD020C As the AS3691 is not directly connected to this supply. Only the parameters VINVREG, VIN5V and VIN15V have to be guaranteed by the application All pins except CURR1, CURR2, CURR3 and CURR4 Depending on actual PCB layout and especially number of vias below the exposed pad – see layout recommendations; can be improved e.g. with Al-PCB or airflow 6.2 Operating Conditions Table 4 – Operating Conditions Symbol VDD Parameter Main Supply Min Typ Max Not Limited Unit V % V V Note Supply is not directly connected to the AS3691 – see section ‘Shunt Regulator’ Applies only for supply VREG is connected via Rvdd If internally (shunt-)regulated by D1 If externally supplied VDDTOL Main Supply Voltage Tolerance VREGINT VREGEXT -20 5.0 4.5 5.2 4.75 +20 5.4 5.0 2.5 Supply (shunt regulated by AS3691) IVREG TAMB Supply Current Ambient Temperature -20 25 Excluding current through shunt mA regulator (D1) – see section ‘Shunt Regulator’ °C 85 www.austriamicrosystems.com (ptr) Revision 2.3 6 - 22 AS3691 Datasheet 6.3 Electrical Characteristics Table 5 – Analog Electrical Characteristics Symbol VCURR Parameter Current Source CURR1 to CURR4 Voltage Compliance Current Source Range Min 0.9 0.41 10 -0.5 Typ Max 15.0 15.0 400(1) +0.5 Unit V V mA % Note at 400mA; total power dissipation limit PT must not be exceeded at 100mA ONx = high ICURRx = 250mV / Rix (x=1...4) @25C TJUNCTION, excluding variation of external resistors; V(CURRx)