AL5811 60V, LINEAR 75mA ADJUSTABLE CURRENT LED DRIVER Description Pin Assignments The AL5811 is a Linear LED driver with an adjustable LED current up to 75mA offering excellent temperature stability and output handling capability. The AL5811 simplifies the design of linear and isolated or non-isolated LED drivers by setting the LED current with standard value resistors. (Top View) The AL5811 has an open drain output that can swing from 1V up to 60V enabling it drive long LED chains. Its low 0.5V RSET pin is VCC 1 8 LED NC 2 7 NC NC 3 6 NC RSET 4 outside of the LED current path and so accuracy is maintained while minimizing the required overhead to regulate the LED current. This reduces its power dissipation when compared to traditional linear LED drivers. This makes it ideal for driving LEDs up to 75mA. 5 GND MSOP-8EP (Top View) Longer LED chains can be driven by tapping VCC from the chain, where the chain voltage may exceed 60V. VCC 1 The AL5811 is available in the exposed pad MSOP-8EP and U-DFN3030-6 packages. NC 2 RSET 3 Exposed Pad 6 LED 5 NC 4 GND U-DFN3030-6 Applications Features Low Reference Voltage (VRSET = 0.5V) -40C to +125C Temperature Range 6% Typical LED Current Tolerance Low Temperature Drift 1.0V to 60V Open-Drain Output High Power Supply Rejection MSOP-8EP and U-DFN3030-6 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. "Green" Device (Note 3) Notes: Isolated Offline LED Converters Linear LED Driver LED Signs Instrumentation Illumination 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated's definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green" products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. Typical Applications Circuit AL5811 Document number: DS35255 Rev. 3 - 2 1 of 14 www.diodes.com November 2016 (c) Diodes Incorporated AL5811 Pin Descriptions Pin Name Pin Number MSOP-8EP U-DFN3030-6 VCC 1 1 RSET 4 3 GND LED NC 5 8 2, 3, 6, 7 4 6 2, 5 EP Exposed Pad Exposed Pad Function Supply Input. Connect a 0.1F ceramic capacitor between VCC and GND as close as possible to the device. LED Current Setting Pin. Connect a resistor from this pin to GND: ILED = 750/RSET May also be used to provide PWM dimming functionality Ground Reference Point of Device. LED Current Sink Connection. Unused Exposed Pad (bottom). Used to improve thermal impedance of package. It must be connected to GND directly underneath the package. Functional Block Diagram VCC LED Current Regulator + - RSET GND Absolute Maximum Ratings (@TA = +25C, unless otherwise specified.) Symbol Parameters Ratings Unit VCC Supply Voltage Relative to GND Pin (Note 4) -0.3 to +66 V VLED LED Voltage Relative to GND Pin (Note 4) -0.3 to +66 V VRSET RSET Voltage Relative to GND Pin -0.3 to +6 V LED Pin Current Sink Current Range 85 mA ESD Protection - Human Body Model ESD Protection - Charged Device Model 1 1.2 kV kV ILED ESD HBM ESD CDM TJ Operating Junction Temperature -40 to +150 C TST Storage Temperature -55 to +150 C Notes: 4. VCC pin can be greater or smaller than VLED; neither should go below GND. Caution: Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time. Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices AL5811 Document number: DS35255 Rev. 3 - 2 2 of 14 www.diodes.com November 2016 (c) Diodes Incorporated AL5811 Package Thermal Data Package MSOP-8EP U-DFN3030-6 Notes: JC Thermal Resistance Junction-to-Case (Note 5) 37 13 JA Thermal Resistance Junction-to-Ambient (Note 5) PDIS TA = +25C, TJ = +125C 85C/W (Note 6) 71C/W (Note 7) 1.2W 1.40W 5. Dominant conduction path via exposed pad. 6. Test condition for MSOP-8EP: Device mounted on FR-4 PCB (51mm x 51mm 2oz copper, minimum recommended pad layout on top layer and thermal vias to bottom layer ground plane. For better thermal performance, larger copper pad for heat-sink is needed. 7. Test condition for U-DFN3030-6: Device mounted on FR-4 PCB (51mm x 51mm 2oz copper, minimum recommended pad layout on top layer and thermal vias to bottom layer with maximum area ground plane. For better thermal performance, larger copper pad for heat-sink is needed Recommended Operating Conditions (@TA = +25C, unless otherwise specified.) Symbol Min Max VCC Supply Voltage Range Relative to GND Pin 2.0 60 VLED OUT Voltage Range Relative to GND Pin 1.0 60 ILED LED Pin Current (Notes 8 & 9) 10 75 mA Operating Ambient Temperature Range -40 +125 C TA Notes: Parameter VRSET (@TA = +25C, VCC = 2.0V, VLED = 1.0, RSET = 15k, unless otherwise specified.) (Note 10) Parameter RSET Voltage Conditions -- REGLINE ILED Current Accuracy LED Current Line Regulation Typ Max Unit -- 0.5 -- V 7.9 9 10.1 18 20 22 70 75 80 47 50 53 46 50 54 7.65 9 10.35 43 50 58 TA = +25C mA RSET = 15k TA = -40C to +125C VCC = 3.5V to 60V RSET = 82.5k RSET = 15k TA = -40C to +125C VCC = 2.0V to 3.5V VCC = 3.5V to 60V TA = +25C -- 0.25 -- TA = +25C -- 200 300 TA = -40C to +125C -- -- 350 TA = +125C -- -- 1 A -- -- +155 -- C -- -- +20 -- C 2.0V VCC 60V ILEAK LED Pin Leakage Current VCC = 60V; VLED = 60V RSET = Open Circuit TSHDN Thermal Shutdown THYS Thermal Shutdown Hysteresis Note: Min RSET = 37.5k Supply Current ICC TA = -40C to +125C RSET = 82.5k RSET = 10k, VCC = 3.5V ILED V 8. Maximum LED current is also limited by ambient temperature and power dissipation such that junction temperature should be kept less than or equal +125C. 9. For VCC < 3.5V, Maximum LED current is 50mA. Electrical Characteristics Symbol Unit -- % A 10. All voltages unless otherwise stated are measured with respect to GND pin. AL5811 Document number: DS35255 Rev. 3 - 2 3 of 14 www.diodes.com November 2016 (c) Diodes Incorporated AL5811 Typical Performance Characteristics 80 90 70 80 70 LED CURRENT (mA) 60 LED CURRENT (mA) RSET = 10K 50 40 30 20 60 RSET = 15K 50 40 30 RSET = 37.4K 20 10 10 0 0 VCC = 3.5V VLED = 1.0V -40 25 125 AMBIENT TEMPERATURE (C) LED Current vs. Ambient Temperature INPUT VOLTAGE (V) LED Current vs. Input Voltage 80 60 RSET = 10K RSET = 15K 50 60 LED CURRENT (mA) LED CURRENT (mA) 70 40 30 20 RSET = 15K 50 40 30 RSET = 37.4K 20 10 10 VIN = 3.5V T A = +25C 0 0 14 1 2 3 4 7 8 LED PIN VOLTAGE (V) LED Current vs. LED Pin Voltage 9 0 0.5 10 1.0 1.5 2.0 2.5 3.0 3.5 INPUT VOLTAGE (V) LED Current vs. Input Voltage 4.0 0.6 RSET = 75K VIN = 9V RSET = 15K 12 0.5 10 0.4 VRSET (V) LED CURRENT (mA) VCC = 3.5V TA = +25C 08 Tshdn 06 Thys 0.3 0.2 04 0.1 02 0 125 130 135 140 145 150 155 AMBIENT TEMPERATURE(C) Thermal Shutdown MSOP-8EP AL5811 Document number: DS35255 Rev. 3 - 2 160 4 of 14 www.diodes.com 0 VLED = 1.0V TA = +25C 2 3 20 INPUT VOLTAGE (V) RSET Voltage vs. Input Voltage 45 November 2016 (c) Diodes Incorporated AL5811 Typical Performance Characteristics (Continued) 300 0.494 0.493 250 RSET = 15k SUPPLY CURRENT (A) RSET VOLTAGE (V) 0.492 0.491 0.490 0.489 0.488 RSET = 10K 200 150 100 RSET = 15K RSET = 37.4K 0.487 0.486 0.485 50 VCC = 3.5V VLED = 1.0V VLED = 1.0V TA = +25C 0 0 -40 25 125 AMBIENT TEMPERATURE (C) R SET Voltage vs. Ambient Temperature 5 10 15 20 25 30 35 40 45 50 55 60 INPUT VOLTAGE (V) Supply Current vs. Input Voltage 250 RSET = 10K SUPPLY CURRENT (A) 200 RSET = 15K 150 RSET = 37.4K 100 50 VCC = 3.5V VLED = 1.0V 0 -40 25 125 AMBIENT TEMPERATURE (C) Supply Current vs. Ambient Temperature AL5811 Document number: DS35255 Rev. 3 - 2 5 of 14 www.diodes.com November 2016 (c) Diodes Incorporated AL5811 Typical Performance Characteristics (Cont.) AL5811 Document number: DS35255 Rev. 3 - 2 6 of 14 www.diodes.com November 2016 (c) Diodes Incorporated AL5811 Application Information Description The AL5811 is a Linear LED driver and in normal operation has the LEDs connected to the same potential as its V CC pin and regulates the LED current by sinking current into to its LED pin. The LED current is set by the use of an external resistor, RSET, connected from the RSET pin to GND. This resistor supplies the bias current of the AL5811 together with current regulator to set the LED current. The LED current is determined by this equation: ILED 1500 * 0.5 R SET Where: 1500 is the current ratio between the LED pin current and RSET pin current. With RSET = 15k ILED 1500 * 0.5 50mA 15k The AL5811 with its 60V capability on its supply pin, V CC, and its LED drive pin allows it to operate from supply rails up to 60V and/or directly drive LED chains up to 60V as shown in Figures 1 and 2. The voltage applied to the VCC pin can be greater or lower than the voltage applied to the LED string. Figure 2 shows where you might power the AL5811 from a 5V rail and power the LED string from a 12V rail. VLED VIN VCC CIN 0.1F LED AL5811 SET GND RSET = 10k Figure 2 Low Side Current LED Setting (Non-Dimming Application Only) Figure 1 Low Side Current LED Setting AL5811 Document number: DS35255 Rev. 3 - 2 7 of 14 www.diodes.com November 2016 (c) Diodes Incorporated AL5811 Application Information (Continued) High Voltage Operation An extension of Figure 2 is to derive the power for the AL5811 from the LED chain itself, see Figure 3. LED chains greater than 60V can be driven in this manner as long PWM dimming is not utilized. Figure 3 Low Side LED String Tapping Figure 4 High Side Current LED String (Non-Dimming Application Only) (VCC to GND >= 2.0V) Figure 2 shows the use of RC delay to match the power time delay between V CC and LED pin. The AL5811 can also be used on the high side of the LEDs, see Figure 3. This is a simple way of extending the maximum LED chain voltage, however, it does increase the minimum system input voltage to: VIN(MIN) = VLED_CHAIN + 2.0V Where: VLED_CHAIN is the LED chain voltage AL5811 Document number: DS35255 Rev. 3 - 2 8 of 14 www.diodes.com November 2016 (c) Diodes Incorporated AL5811 Application Information (Cont.) PWM Dimming LED current dimming can be achieved by driving the RSET pin via the current setting resistor (RSET) and series MOSFET switch to ground (Figure 5). The RSET pin current is then effectively switched on and off causing the LED current to turn on and off. 80 LED CURRENT (mA) 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 DUTY CYCLE (%) LED Current vs. Duty Cycle 90 100 Frequency = 100Hz; Duty Cycle = 0.1% to 100%; RSET = 10K; 2LEDs in Series Figure 5 PWM Dimming Figure 6 PWM Dimming Linearity Thermal Considerations When designing linear LED drivers careful consideration must be given to: 1. the power dissipation within the LED driver and 2. PCB layout/heat sinking. A Linear LED driver has to be able to handle the large potential input voltage variations due to the supply voltage tolerance and also the variation in LED forward voltage due to binning and temperature. This can result in a large potential difference across the LED driver resulting in a larger than anticipated power dissipation. For example, in a 12V powered system with a 5% output voltage tolerance, the input voltage could typically vary from 12.6V down to 11.4V, driving 3 LEDs with a voltage varying from 3V to 3.5V at 75mA. This means that the LED driver has to cope with a voltage drop across varying from approximately 3.6V to 0.9V. This means that the power dissipation of the AL5811 could be as much as 270mW. Figure 7 below shows how the AL5811's power dissipation capability varies with package. These values will vary with PCB size and area of metal associated with the ground plane used for heat sinking. By increasing the area on the top layer, the thermal impedance of both packages could be improved. 1.6 U-DFN3030-6 POWER DISSIPATION (W) 1.4 1.2 MSOP-8EP 1.0 0.8 0.6 0.4 0.2 0.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 AMBIENT TEMPERATURE (C) AL5811 Document number: DS35255 Rev. 3 - 2 Figure 7 Power Dissipation Derating 9 of 14 www.diodes.com November 2016 (c) Diodes Incorporated AL5811 Ordering Information (Note 11) Part Number Package Code Packaging AL5811MP-13 AL5811FF-7 MP FF MSOP-8EP U-DFN3030-6 Note: Quantity 7"/13" Tape and Reel Part Number Suffix 2,500/Tape & Reel 3,000/Tape & Reel -13 -7 11. For packaging details, go to our website at http://www.diodes.com/products/packages.html. Marking Information (1) MSOP-8EP ( Top View ) 8 7 Logo 5 YWXE Part Number AL5811 1 (2) 6 2 3 G : Green MSOP8-EP Y : Year : 0~9 W : Week : a~z : 1~26 week; A~Z : 27~52 week; Z represents 52 and 53 week 4 U-DFN3030-6 ( Top View ) XX YW X AL5811 Document number: DS35255 Rev. 3 - 2 XX : Identification Code Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green Part Number Package Identification Code AL5811FF-7 U-DFN3030-6 A9 10 of 14 www.diodes.com November 2016 (c) Diodes Incorporated AL5811 Package Outline Dimensions Please see http://www.diodes.com/package-outlines.html for the latest version. MSOP-8EP D D1 E 10 0.25 x 4X E2 Gauge Plane Seating Plane a y 1 L 4X 10 8Xb e Detail C E3 A1 A3 c A2 A D E1 See Detail C MSOP-8EP Dim Min Max Typ A 1.10 A1 0.05 0.15 0.10 A2 0.75 0.95 0.86 A3 0.29 0.49 0.39 b 0.22 0.38 0.30 c 0.08 0.23 0.15 D 2.90 3.10 3.00 D1 1.60 2.00 1.80 E 4.70 5.10 4.90 E1 2.90 3.10 3.00 E2 1.30 1.70 1.50 E3 2.85 3.05 2.95 e 0.65 L 0.40 0.80 0.60 a 0 8 4 x 0.750 y 0.750 All Dimensions in mm U-DFN3030-6 A3 A1 A Seating Plane D D2 (Pin #1 ID) E2 E 45(0.35*0.35) Z(4x) AL5811 Document number: DS35255 Rev. 3 - 2 L e U-DFN3030-6 Dim Min Max Typ A 0.57 0.63 0.60 A1 0 0.05 0.02 A3 0.15 b 0.35 0.45 0.40 D 2.95 3.05 3.00 D2 2.25 2.45 2.35 E 2.95 3.05 3.00 E2 1.48 1.68 1.58 e 0.95 L 0.35 0.45 0.40 Z 0.35 All Dimensions in mm b 11 of 14 www.diodes.com November 2016 (c) Diodes Incorporated AL5811 Suggested Pad Layout Please see http://www.diodes.com/package-outlines.html for the latest version. MSOP8-EP C X G Y Y2 Dimensions C G X X1 Y Y1 Y2 Y1 X1 Value (in mm) 0.650 0.450 0.450 2.000 1.350 1.700 5.300 U-DFN3030-6 X2 X1 C Dimensions C X X1 X2 Y Y1 Y2 Y1 Y2 C-0.409 Y Value (in mm) 0.950 0.500 2.400 2.550 0.600 1.780 3.300 X AL5811 Document number: DS35255 Rev. 3 - 2 12 of 14 www.diodes.com November 2016 (c) Diodes Incorporated AL5811 Taping Orientation (Note 12) U-DFN3030-6 Note: 12. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf. AL5811 Document number: DS35255 Rev. 3 - 2 13 of 14 www.diodes.com November 2016 (c) Diodes Incorporated AL5811 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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