AL8820 40V, 2A BOOST/BUCK LED DRIVER Description Pin Assignments (Top View) The device integrates two DC/DC converters. The Two stage design offers superior performance for MR16/AR111 applications. The first stage is a boost PFC stage which improves PF, reduces EMI, powers up the Buck stage and the compatibility of Electronic Transformers. The Buck stage regulates the LED current thru the setting of external sense resistor. The integrated low RDSON of integrated MOSFETs reduce the conduction power loss. A compact thermally efficient SO8EP package, the AL8820 provides an ideal solution for MR16/AR111 applications. Features Notes: SW2 7 VCC 3 6 VIN 4 5 CS2 1 CS1 2 FB COMP EP Applications Wide Input Voltage Range: 5V to 36V Internal 40V NDMOS Switch 2A Output Current Continuous Conduction Mode (CCM) Operation Up to 1MHz Switching Frequency High PF > 0.9 and Low THD < 30% and Low Ripple < 20% Internal Protections Under Voltage Lock Out (UVLO) Output Open/Short Protection Over Temperature Protection (OTP) SO-8EP Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) 8 SW1 SO-8EP MR16 Lamps AR111 General Illumination Lamps 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 L1 L2 D1 Vac D2 RSET2 D5 D3 R1 D4 C1 C2 D6 C5 VOUT R2 L3 RSET1 RHYS SW2 SW1 CS1 FB AL8820 NEW PRODUCT The AL8820 is a highly integrated high performance LED driver optimized for MR16/AR111 and other similar LED lamp applications. With a proprietary control scheme, the LED driver is compatible with many commonly used electronic transformers and meets High Power Factor (PF) and low Total Harmonic Distortion (THD) requirements for these applications. COMP C4 AL8820 Document number: DS37369 Rev. 1 - 2 1 of 15 www.diodes.com VCC C3 VIN CS2 (Exposed Pad) December 2014 © Diodes Incorporated AL8820 Pin Descriptions Pin Name 1 SW1 Integrated Boost MOS Drain 2 CS1 Boost Input Current Sense Pin 3 FB 4 COMP 5 CS2 Buck Output Current Sense Pin 6 VIN IC Input Voltage, Adding from Boost Output Voltage 7 VCC Supply Voltage For Internal Circuit 8 SW2 Integrated Buck MOS Drain 9 Exposed Pad NEW PRODUCT Pin Number Function Boost Output Voltage Feedback Pin Soft-start and Boost Control Loop Compensation Connected To Ground Functional Block Diagram VIN CS2 6 5 VCC Internal Regulator VCC CS2 VREF 7 ICS Trimming Resistor VCS2 HYSTERESIS COMPARATOR VBG UVLO Chip_EN Driver VREF VIN OVP CTL 9 OVP LOGIC GND PWM1 2 IHYS OTP VFB SW2 VCC VBG Bandgap 8 CS1 CS1 OTP VCS1 1 VCC SW1 Driver COMPARATOR 3 FB PWM1 EA IHYS VBG 4 COMP AL8820 Document number: DS37369 Rev. 1 - 2 2 of 15 www.diodes.com December 2014 © Diodes Incorporated AL8820 Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified. Note 4) NEW PRODUCT Parameter Symbol Value Unit VIN Pin Voltage VIN -0.3 to 40 V SW1 Pin Voltage VSW1 -0.3 to 40 V SW2 Pin Voltage VSW2 -0.3 to 40 V COMP Pin Voltage VCOMP -0.3 to 6 V CS1 Pin Voltage VCS1 -0.3 to 6 V CS2 Pin Voltage VCS2 -0.3 to 40 V FB Pin Voltage VFB -0.3 to 6 V VCC Pin Voltage VCC -0.3 to 6 V TJ +150 ºC TSTG -65 to +150 ºC θJA 66 °C/W TLEAD +300 ºC ESD (Machine Model) – 200 V ESD (Human Body Model) – 2000 V Operating Junction Temperature Storage Temperature Thermal Resistance (Junction To Ambient) (Note 5) Lead Temperature (Soldering, 10sec) Notes: 4. Stresses greater than those listed under “Absolute Maximum Ratings” 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 under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. 5. 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. Recommended Operating Conditions Symbol Parameter VIN VIN Pin Voltage TA Ambient Temperature AL8820 Document number: DS37369 Rev. 1 - 2 3 of 15 www.diodes.com Min Max Unit 5 36 V -40 +105 °C December 2014 © Diodes Incorporated AL8820 Electrical Characteristics (@TA = +25°C, unless otherwise specified.) Parameters Symbol Conditions Min Typ Max Unit NEW PRODUCT Input Supply VIN Pin Voltage VIN – 5 – 36 V Quiescent Current IQ No Switching – 1 – mA Under-Voltage Lockout Voltage VUVLO VIN Rising – 4.2 – V UVLO Hysteresis VHYS – – 500 – mV VCC – 4.5 5 5.5 V VCC Regulator VCC Pin Voltage Source Current Capability – VCC = 5V 10 – – mA Load Regulation – – – 4 – % MOS Voltage Stress (Note 6) VDS1 – – 40 – V MOS Current Stress (Note 6) IDS1 – – 2 – A RDSON1 – – 250 – mΩ MOS Voltage Stress (Note 6) VDS2 – – 40 – V MOS Current Stress (Note 6) IDS2 – – 2 – A RDSON2 – – 250 – mΩ Error Amplifier Trans-conductance GEA – – 1000 – µA/V Sourcing Current IO_H VCOMP = 0.5V – 68 – µA Sinking Current IO_L VCOMP = 4.5V – 68 – µA FB Pin Voltage VFB – 1.18 1.22 1.26 V VOVP – 1.59 1.66 1.75 V VOVP_HYS – 0.15 0.2 0.25 V VCS1_MIN VCOMP = 0V – -90 – mV IHYS – 85 100 115 µA Buck Sense Voltage High Level VCSH – – 115 – mV Buck Sense Voltage Low Level VCSL – – 85 – mV VCS2_AVE – 95 100 105 mV Thermal Shutdown (Note 6) TOTSD – +140 +160 – ºC Thermal Shutdown Hysteresis (Note 6) THYS – – +40 – ºC Integrated NMOS_BUCK MOS RDSON Integrated NMOS_BOOST MOS RDSON Compensation and Soft Start (COMP Pin) FB OVP Voltage FB OVP Voltage Hysteresis Hysteresis Competitor (Boost) Boost Sense Voltage Low Level Hysteresis Current Hysteresis Competitor (Buck) Buck Sense Voltage Average Level Over-Temperature Protection Note 6: These parameters, although guaranteed by design, are not 100% tested in production. AL8820 Document number: DS37369 Rev. 1 - 2 4 of 15 www.diodes.com December 2014 © Diodes Incorporated AL8820 Performance Characteristics Quiescent Current vs. VIN Pin Voltage Quiescent Current vs. Ambient Temperature 1.4 1.4 Quiescent Current (mA) Quiescent Current (mA) 1.2 1.1 1.0 0.9 0.8 1.2 1.1 1.0 0.9 0.8 0.7 0.7 0.6 -45 0.6 4 8 12 16 20 24 28 32 36 -30 -15 0 15 30 45 60 75 VCC Pin Voltage vs. VIN Pin Voltage 105 VCC Pin Voltage vs. Ambient Temperature 5.5 5.4 VIN = 12V 5.4 5.3 5.3 VCC Pin Voltage (V) VCC Pin Voltage (V) 90 o Ambient Temperature ( C) VIN Pin Voltage (V) 5.2 5.1 5.0 5.2 5.1 5.0 4.9 4.8 4.7 4.9 4.6 4.8 4 8 12 16 20 24 28 32 36 VIN Pin Voltage (V) 4.5 -45 -30 -15 0 15 30 45 60 75 90 105 o Ambient Temperature ( C) FB Pin Voltage vs.VIN Pin Voltage FB Pin Voltage vs. Ambient Temperature 1.24 1.24 1.23 1.23 FB Pin Voltage (V) VIN = 12V FB Pin Voltage (V) NEW PRODUCT VIN = 12V 1.3 1.3 1.22 1.21 1.21 1.20 1.20 1.19 4 1.22 8 12 16 20 24 28 32 36 1.19 -45 Vin Pin Voltage (V) AL8820 Document number: DS37369 Rev. 1 - 2 -30 -15 0 15 30 45 60 75 90 105 o Ambient Temperature ( C) 5 of 15 www.diodes.com December 2014 © Diodes Incorporated AL8820 Performance Characteristics (Cont.) Boost Sense Voltage Low Level vs. VIN Pin Voltage Boost Sense Voltage Low Level vs. Ambient Temperature -80 Boost Sense Voltage Low Level (mV) NEW PRODUCT Boost Sense Voltage Low Level (mV) -80 -82 -84 -86 -88 -90 -92 4 8 12 16 20 24 28 32 VIN = 12V -82 -84 -86 -88 -90 -92 -45 36 Vin Pin Voltage (V) -30 -15 0 15 30 45 60 75 90 105 o Ambient Temperature ( C) Hysteresis Current vs. Ambient Temperature 114 114 112 112 110 110 Hysteresis Current (A) Hysteresis Current (A) Hysteresis Current vs. VIN Pin Voltage 108 106 104 102 108 106 104 102 100 100 98 4 VIN = 12V 8 12 16 20 24 28 32 98 -45 36 -30 -15 Vin Pin Voltage (V) 15 30 45 60 75 90 105 o Buck Sense Voltage Average Level vs. VIN Pin Voltage Buck Sense Voltage Average Level vs. Ambient Temperature 104 104 Buck Sense Voltage Average Level (mV) Buck Sense Voltage Average Level (mV) 0 Ambient Temperature ( C) 103 102 101 100 99 98 4 8 12 16 20 24 28 32 36 Document number: DS37369 Rev. 1 - 2 102 101 100 99 98 -45 -30 -15 0 15 30 45 60 75 90 105 o Ambient Temperature ( C) VIN Pin Voltage (V) AL8820 VIN = 12V 103 6 of 15 www.diodes.com December 2014 © Diodes Incorporated AL8820 Application Information AL8820 Operation The device integrates two DC/DC regulators. This two stage design offers superior performance for MR16/AR111 applications. The first stage is a boost PFC stage which improves PF, reduces EMI and conditions the input to be compatible with many of the most commonly used Electronic Transformers (ET). This input stage also provides power for the second stage buck converter which provides regulated constant output current for the LEDs. L1 NEW PRODUCT L2 D1 Vac D2 RSET2 D5 D3 R1 D4 C1 C2 D6 C5 VLED R2 L3 RSET1 RHYS SW2 CS1 FB AL8820 SW1 C3 VIN CS2 COMP C4 VCC (Exposed Pad) Figure 1. Typical Application Circuit VIN Voltage Setting VIN Voltage is the output voltage of boost section and is also the input voltage of the buck section. Therefore V IN must be set sufficiently higher than the output voltage of buck section. For the Boost application, the output voltage can be defined as: VIN 1.22V R1 R 2 R2 RSET1 and RHYS Setting The Boost converter of the AL8820 operates at continuous conduction mode and is based on hysteresis schematic which has lower threshold and upper threshold. Refer to Figure 2 depicting the inductor current waveform. IL Peak or Upper Threshold IL IL(peak) IL(ave) IL(val) Valley or Lower Threshold tON tOFF Time Figure 2. Inductor Current When switch SW1 is turned on, the inductor current flows through RSET1 and ramps up linearly. The rising current produces a voltage ramp across RSET1. When the voltage across RSET1 reaches the upper threshold, switch SW1 is turned off. The inductor current continues to flow through RSET1 but decays. The decaying current produces a falling voltage at RSET1. When the voltage across RSET1 falls to the lower threshold, switch SW1 is turned on again. The lower threshold voltage VLT depends on the voltage VCOMP at COMP pin that varies with the input voltage and output load. The equation is shown as below. AL8820 Document number: DS37369 Rev. 1 - 2 7 of 15 www.diodes.com December 2014 © Diodes Incorporated AL8820 Application Information (Cont.) VLT (VCOMP 1.5) 0.6 1.4 mV ,1.5V VCOMP 5V 16 88mV , 0V VCOMP 1.5V NEW PRODUCT The range of VCOMP is from 0V to 5V. The upper threshold depends on the lower threshold and the hysteresis value. The hysteresis value is set by external resister RHYS. It is defined as below. VHYS RHYS 100 A According to the operation principle , the peak to peak current ∆IL and the valley current IL(val) can be obtained by the below equations. I L ( val ) I L VLT RSET 1 VHYS RSET 1 Where: ∆IL is the peak to peak current of inductor. IL(val) is the valley current of inductor. From the Figure 2, the relationship between IL(peak), IL(val), IL(ave) and ∆IL can be obtained as below. I L ( peak ) I L ( val) I L 1 I L ( ave) I L ( val) I L 2 Where: IL(peak) is the peak current of inductor. IL(ave) is the average current of inductor. As we know the average current IL(ave) depends on the output power, rated input voltage VIN1 of boost converter and total efficiency η. So the average current IL(ave) can be obtained by the below equation. I L ( ave) VLED I LED VIN1 Where: AL8820 Document number: DS37369 Rev. 1 - 2 8 of 15 www.diodes.com December 2014 © Diodes Incorporated AL8820 Application Information (Cont.) VLED is the output voltage of Buck converter. ILED is the output current of Buck converter. NEW PRODUCT Set ratio of ∆IL to IL(peak) as K. K I L I L ( peak ) RSET1 and RHYS can be obtained from above equations: ((VCOMP 1.5) 0.6 1.4) (2 K ) VIN 1 103 1.5V VCOMP 5V 32 VLED I LED (1-K) RSET 1 = 3 44 (2 K ) VIN 1 10 , 0V V COMP 1.5V VLED I LED (1-K) RHYS = 2 VLED I LED K RSET 1 104 VIN1 (2 K ) When the value of K, η and VCOMP are provided, the value of resister RSET1 and RHYS can be calculated according to these above equations. In order to get appropriate efficiency and Electronic Transformer (ET) compatibility, generally K is set between 0.4 and 0.8. Due to the range of VCOMP is from 0V to 5V, in order to get output voltage regulation, generally VCOMP is set as 3V at rated input voltage. Step-Up Converter Inductor Selection Because of the using of the hysteretic control scheme, the switching frequency in a boost configuration can be adjusted in accordance to the value of the inductor being used. The value of the inductor can be determined by using the following equation: L2 [VIN1 ( RSET1 RL RDSON1 ) I L ( ave) ] [V INVIN1 VF ( RL RSET1 ) I L ( ave) ] I L [VIN VF (2RSET1 2RL RDSON1 ) I L ( ave) ] f SW 1 Where: L2 is the coil inductance. RL is the coil resistance. RSET1 is the current sense resistance. RDSON1 is the switch SW1 resistance. VIN1 is the rated input voltage of the boost converter. VIN is the output voltage of boost converter. VF is the diode forward voltage at the required load current. fSW1 is the desired switching frequency. AL8820 Document number: DS37369 Rev. 1 - 2 9 of 15 www.diodes.com December 2014 © Diodes Incorporated AL8820 Application Information (Cont.) NEW PRODUCT Low switching frequency can decrease the switching loss but need to choose higher inductor values that will result in larger size in order to meet the saturation current. For example, the relationship between switching frequency and inductor value is shown as below Table 1 in the same application system. Considering these factors, 500kHz switching frequency is recommended in typical application. Inductance Value of L2 @ Vac = 12Vac, VIN = 22V, VOUT = 10V, IOUT = 650mA Operation Frequency of SW1 at Peak Voltage of Vac 10µH 637kHz 15µH 500kHz 27µH 373kHz Table 1 LED Current Control The LED current is controlled by the resistor RSET2 in Figure 1. Connected between VIN pin and CS2 pin, the nominal average output current in the LED(s) is defined as: I LED 100mV RSET 2 Buck Converter Inductor Selection The inductance L3 in Buck converter is determined by the following factors: inductor ripple current, switching frequency, V LED/VIN ratio, internal FET, and component parameter. The inductance L3 is calculated according to the following equation: L3 VIN VLED ( RSET 2 RDSON 2 RCOIL ) I LED VLED 1 I LED VIN f SW 2 Where: VIN is the output voltage of Boost converter. VLED is the output voltage of Buck converter. RSET2 is the current sense resistance. RDSON2 is the switch resistance (=0.25Ω). RCOIL is the coil resistance of inductor L3. ∆ILED is the coil peak-peak ripple current, internally set to 0.25 x ILED. fSW2 is the switching frequency. The low switching frequency fSW2 is recommended in order to minimize errors due to switching delays which will result in increased ripple and lower efficiency. Higher switching frequency can choose smaller inductor value that has smaller size in order to meet the saturation current but will increase the switching loss. For example, the relationship between switching frequency and inductor value is shown as below Table 2 in the same application system. Considering these factors, about 300kHz switching frequency is recommended in typical application. AL8820 Document number: DS37369 Rev. 1 - 2 10 of 15 www.diodes.com December 2014 © Diodes Incorporated AL8820 NEW PRODUCT Application Information (Cont.) Inductance Value of L3 @ VIN = 22Vac, VOUT = 10V, IOUT = 650mA Operation Frequency of SW2 33µH 756kHz 47µH 568kHz 68µH 397kHz 100µH 257kHz Table 2 VIN OVP Protection The AL8820 has two kinds of Over-voltage (OVP) protection both of which turn off the power switch SW1. When the voltage at the FB pin exceeds threshold approximately 1.66V, the power switch of step-up stage is turned off. The power switch of boost section can be turned on again once the voltage at the FB pin drops below 1.46V. The AL8820 additionally has an internal over voltage protection to protect the AL8820 from excessive input voltage. When the voltage applied at VIN pin exceeds 39V, it will turn off the power switch SW1. The power switch will turn on once the voltage at VIN drops below 34V. VCC Regulator The VCC pin requires a capacitor for stable operation and to store the charge for the large GATE switching currents. Choose a 10V rated low ESR, X7R or X5R, ceramic capacitor for best performance. A 4.7µF capacitor will be adequate for many applications. Place the capacitor close to the IC to minimize the trace length between the VCC pin and the exposed pad. An internal current limit on the VCC output protects against excessive on-chip power dissipation. The VCC pin has set the output to 5V (typ.) to protect the internal FETs from excessive power dissipation caused by not being fully enhanced. If the VCC pin is used to drive extra circuits beside the AL8820, the extra loads should be limited to less than 8mA. Output Capacitor C1 and C2 of Boost The capacitor C1 is used to hold the bus voltage when the electronic transformer has no output. For most applications, it is recommended to use an aluminum electrolytic capacitor with greater than 220µF capacitance. The output capacitor C2 is selected to handle the output ripple noise requirements. For the best performance, it is recommended to use X7R or better grade ceramic capacitor greater than 1µF capacitance. Compensation Capacitor C4 In applications powered by electronic transformer, the input voltage can change roughly in one cycle of AC power frequency. A 1µF ceramic capacitor C4 connected from COMP pin to ground help to stabilize the control loop of the Boost regulator. Output Capacitor C5 of Buck Higher LED current ripple will shorten the LED life time and increase heat accumulation of LED. To reduce the LED current ripple, an output capacitor in parallel with the LED should be added. Lower ripple can be achieved with higher capacitor values. For most applications, a value of 4.7µF is recommended. Diode Selection For maximum efficiency and performance, the rectifiers (D5, D6) should be fast low capacitance Schottky diodes with low reverse leakage at maximum operating voltage and temperature. With its low power dissipation, the Schottky diode outperforms other silicon diodes and increases overall efficiency. Over Temperature Protection A over temperature protection feature is to protect the AL8820 from excessive internal temperature. When the junction temperature exceeds +160ºC, the internal FETs will be turned off. When junction temperature drops below +120ºC, IC will turn on both FETs and return to normal operation. AL8820 Document number: DS37369 Rev. 1 - 2 11 of 15 www.diodes.com December 2014 © Diodes Incorporated AL8820 Ordering Information NEW PRODUCT AL8820 XX - XX Package Packing SP : SO-8EP 13 :13" Tape & Reel Part Number Package Code Package AL8820SP-13 SP SO-8EP 13” Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13 Marking Information (Top View) 8 7 6 5 Logo Part Number AL8820 YY WW X X E YY : Year : 08, 09, 10~ WW : Week : 01~52; 52 represents 52 and 53 week X X : Internal Code E : SO-8EP 1 AL8820 Document number: DS37369 Rev. 1 - 2 2 3 4 12 of 15 www.diodes.com December 2014 © Diodes Incorporated AL8820 Package Outline Dimensions (All dimensions in mm(inch).) (1) Package Type: SO-8EP 3.800(0.150) 4.000(0.157) 2.110(0.083) 2.750(0.108) 3.402(0.134) NEW PRODUCT 2.710(0.107) 1.270(0.050) TYP 4.700(0.185) 5.100(0.201) 0.300(0.012) 0.510(0.020) 5.800(0.228) 6.200(0.244) 0.050(0.002) 0.150(0.006) 1.350(0.053) 1.550(0.061) 0° 8° 0.400(0.016) 1.270(0.050) 0.150(0.006) 0.250(0.010) Note: Eject hole, oriented hole and mold mark is optional. AL8820 Document number: DS37369 Rev. 1 - 2 13 of 15 www.diodes.com December 2014 © Diodes Incorporated AL8820 Suggested Pad Layout Package Type: SO-8EP NEW PRODUCT (1) Y1 G Z X1 Y E X Dimensions Z (mm)/(inch) G (mm)/(inch) X (mm)/(inch) Y (mm)/(inch) X1 (mm)/(inch) Y1 (mm)/(inch) E (mm)/(inch) Value 6.900/0.272 3.900/0.154 0.650/0.026 1.500/0.059 3.600/0.142 2.700/0.106 1.270/0.050 AL8820 Document number: DS37369 Rev. 1 - 2 14 of 15 www.diodes.com December 2014 © Diodes Incorporated AL8820 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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Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2014, Diodes Incorporated www.diodes.com AL8820 Document number: DS37369 Rev. 1 - 2 15 of 15 www.diodes.com December 2014 © Diodes Incorporated