AL8807W5-7

AL8807 DIODES | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 21

Technical content

Features

• LED driving current up to 1.3A (MSOP-8EP)
• Better than 5% accuracy
• High efficiency up to 96%
• Optimally controlled switching speeds
• Operating input voltage from 6V to 36V
• PWM/DC input for dimming control
• Built-in output open-circuit protection
• SOT25: Available in “Green” Molding Compound (No Br, Sb) with lead Free Finish/ RoHS Compliant (Note 1)
• MSOP-8EP Available in “Green” Molding Compound (No Br, Sb) with lead Free Finish/ RoHS Compliant (Note 1) Pin Assignments

Applications

• MR16 lamps
• General illumination lamps
• 12V powered LED Lamps
• 24V powered LED Lamps Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2). All applicable RoHS exemptions applied.Please visit our website at http://www.diodes.com/products/lead_free.html. Typical Application Circuit SOT25 (Top View) SW GND CTRL SET VIN (Top View) MSOP-8EP SET GND GND CTRL VIN N/C SW SW 100 nF 1µF DFLS2100 D2DFLS2100D3 DFLS 2100 DFLS 2100 DFLS2100 GND SW GND CTRL SET VIN AL8807 0R15 33µH 100nFC5 150µF 150µF C3P1 ANODE CATHODE

HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER AL8807 Document number: DS35281 Rev. 4 - 2 2 of 21 www.diodes.com June 2012 © Diodes Incorporated Pin Descriptions Pin Name Pin Number Descriptions SOT25 MSOP-8EP SW 1 5, 6 Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI. GND 2 2, 3 GND Pin CTRL 3 4 Dimming and On/Off Control Input.

• Leave floating for normal operation. (VCTRL = VREF = 2.5V giving nominal average output current IOUTnom = 0.1/RS)
• Drive to voltage below 0.4V to turn off output current
• Drive with DC voltage (0.5V < VCTRL < 2.5V) to adjust output current from 20% to 100% of IOUTnom
• A PWM signal (low level ≤ 0.4V and high level > 2.6; transition times less than 1us) allows the output current to be adjusted below the level set by the resistor connected to SET input pin. SET 4 1 Set Nominal Output Current Pin. C onfigure the output current of the device. VIN 5 8 Input Supply Pin. Must be locally decoupled to GND with > 2.2µF X7R ceramic capacitor – see applications section for more information. EP - EP Exposed pad/TAB connect to GND and thermal mass for enhanced thermal impedance. Should not be used as electrical ground conduction path. N/C - 7 no connection Absolute Maximum Ratings Symbol Parameter Ratings Unit ESD HBM Human Body Model ESD Protection 2.5 kV ESD MM Machine Model ESD Protection 200 V VIN Continuous VIN pin voltage relative to GND -0.3~40 V VSW SW voltage relative to GND -0.3~40 V VCTRL CTRL pin input voltage -0.3 ~ 6 V ISW-RMS DC or RMS Switch current SOT25 1.25 A MSOP-8EP 1.6 ISW-PK Peak Switch current (<10%) 2.5 A TJ Junction Temperature 150 °C TLEAD Lead Temperature Soldering 300 °C TST Storage Temperature Range -65 to +150 °C Caution: Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause perm anent damage to the device. These are stress ratings only; functional operation of the device at thes e or any other conditions exceeding those i ndicated in this specification is not impl ied. 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 exposu re to ESD events. Suitable ESD precautions should be taken when handling and transporting these devices. Recommended Operating Conditions Symbol Parameter Min Max Unit VIN Operating Input Voltage relative to GND 6.0 36 V VCTRLH Voltage High for PWM dimming relative to GND 2.6 5.5 V VCTRLDC Voltage range for 20% to 100% DC dimming relative to GND 0.5 2.5 V VCTRLL Voltage Low for PWM dimming relative to GND 0 0.4 V fSW Maximum switching frequency 1 MHz ISW Continuous switch current SOT25 1 A MSOP-8EP 1.3 TJ Junction Temperature Range -40 125 °C

HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER AL8807 Document number: DS35281 Rev. 4 - 2 3 of 21 www.diodes.com June 2012 © Diodes Incorporated

Electrical Characteristics

VIN =12V, TA=25oC, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Unit VINSU Internal regulator start up threshold VIN rising 5.9 V VINSH Internal regulator hysteresis threshold VIN falling 100 300 mV IQ Quiescent current Output not switching (Note 2) 350 µA IS Input supply Current CTRL pin floating f = 250kHz 1.8 5 mA VTH Set current Threshold Voltage 95 100 105 mV VTH-H Set threshold hysteresis ±20 mV ISET SET pin input current VSET = VIN-0.1 16 22 µA RCTRL CTRL pin input resistance Referred to internal reference 50 kΩ VREF Internal Reference Voltage 2.5 V RDS(on) On Resistance of SW MOSFET ISW = 1A 0.25 0.4 Ω tR SW rise time VSENSE = 100±20mV fSW = 250kHz VSW = 0.1V~12V~0.1V C L = 15pF 12 ns tF SW fall time 20 ns ISW_Leakage Switch leakage current VIN =30V 0.5 μA θJA Thermal Resistance Junction-to- Ambient (Note 3) SOT25 (Note 4) 250 °C/W MSOP-8EP (Note 5) 69 ΨJL Thermal Resistance Junction-to- Lead (Note 6) SOT25 (Note 4) 50 θJC Thermal Resistance Junction-to- case (Note 7) MSOP-8EP (Note 5) 4.3 Notes: 2. AL8807 does not have a low power standby mode but current consumption is reduced when outp ut switch is inhibited: VSENSE = 0V. Parameter is tested with V CTRL ≤ 2.5V 3. Refer to figure 35 for the device derating curve. 4. Test condition for SOT25: Device mounted on FR-4 PCB (25m m x 25mm 1oz 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. 5. 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 with maximum area ground plane. For better thermal performance, larger copper pad for heat-s ink is needed 6. Dominant conduction path via Gnd pin (pin 2). 7. Dominant conduction path via exposed pad.

Figure 1. Supply Current (not switching) vs. Figure 2. Switching Frequency vs. V

1 LED

Figure 3. LED Current vs. VCTRL Figure 4. I vs. V Figure 5. V vs. Input Voltage Figure 6. V VS. TEMPERATURECTRL

2.48 V ( V )CTRL

0 LED CURRENT ERROR (%)

Figure 7. I LED Figure 9. S

2 LEDS

3 LEDS

Figure 13. LED Current Deviation vs. Input Voltage Figure 14. Switching Frequency vs. Input Voltage Figure 15. LED Current Deviation vs. Input Voltage Figure 16. Switching Frequency vs. Input Voltage Figure 17. LED Current Deviation vs. Input Voltage

4 LEDs

5 LEDs

6 LEDs

7 LEDs

8 LEDs

Figure 18. Switching Frequency vs. Input Voltage

7 LEDs 8 LEDs

Figure 19. LED Current Deviation vs. Input Voltage

5 LEDs6 LEDs

7 LEDs8 LEDs

2 LEDs3 LEDs

Figure 20. Switching Frequency vs. Input Voltage

1 LED100

Figure 21. LED Current Deviation vs. Input Voltage Figure 22. Switching Frequency vs. Input Voltage Figure 23. LED Current Deviation vs. Input Voltage Figure 24. Switching Frequency vs. Input Voltage

Figure 25. LED Current Deviation vs. Input Voltage

5 LEDs6 LEDs7 LEDs 8 LEDs

Figure 26. Switching Frequency vs. Input Voltage Figure 27. LED Current Deviation vs. Input Voltage

5 LEDs6 LEDs7 LEDs8 LEDs

2 LEDs3 LEDs4 LEDs

Figure 28. Switching Frequency vs. Input Voltage Figure 29. LED Current Deviation vs. Input Voltage

2 LEDs 3 LEDs4 LEDs

Figure 30. Switching Frequency vs. Input Voltage

= V1 R DC Dimming Further contro the average LE LEDI = With 0.5V ≤ VC 2.5V, the LED When the CTR r: DS35281 Rev. 4 on Informat is a hystereti c t provide a P er PCBs that ange. eration ration, when v r R1, inductor L and the inducto rrent produces ortional voltage tage reaches a R1, L1, the LE D y the forward vo current produ s R1 is applied witch is turned R1. t Control ent is controlled tween VIN and 1 R VTHD= or a desired LE ≈= 66. 0 1 . 0 I V LED THD g l of the LED cu ED current bec SET THD REF CTRL R V V CTRL ≤ 2.5V the current will be RL voltage falls - 2 tion c (also known PCB area-po w the MSOP-8 E voltage is appli L1, and the L E r L1. a voltage ra m e to the input o an internally set Ds and the sc oltage drop of t ces a falling v at the input of on again. Thi s d by the resisto SET the nomin ED current of 66 Ω≈ m150 urrent can be a comes: e LED current clamped to ap s below the thre HIGH E ww as equal rip p wer dissipatio n EP version is u ed at +V IN, the EDs. The curr e mp across R 1. T of the internal c t upper thresho hottky diode D the LEDs and t voltage at R 1, w the internal co s switch-on-an or R1 in Figure Fig. 30 Typic nal average ou 60mA and a de chieved by driv varies linearly pproximately 10 eshold, 0.4V, th FFICIENCY 9 of 21 ww.diodes.com ple) LED drive n capability c o used to maxi m e AL8807 inte r ent ramps up l The internal ci comparator. old, the interna D1, and back t o the schottky dio which is sens e mparator. Whe d-off cycle co n 30. cal Applicati utput current in efault voltage V ving the CTRL y with V CTRL, a 00% and follow he output switc Y LOW EM r with integra t ompromise. It mize the allow a rnal switch is t linearly, and t h rcuit of the A L al switch is turn o the supply r a ode. ed by the AL8 8 en this voltage ntinues to pro v on Circuit the LED(s) is d VCTRL=2.5V the pin with an ext as in figure 2. ws SET THD LED R VI = ch is turned off MI 36V 1A B ted power swi t is recomme n able LED curr e turned on. Cu r he ramp rate i s L8807 senses t ned off. The ind ail, but it dec a 807. A voltage falls to the inte vide the avera g defined as: e resulting resis ternal voltage ( If the CTRL p which allows P AL BUCK LED © Diodes tch. It is avai l nded that at h ent over a wi d rrent starts to f s determined b the voltage ac r ductor current c ays, with the r a proportional to ernally set lowe ge LED curre n stor is: (between 0.4V in is brought h PWM dimming. L8807 DRIVER June 2012 s Incorporated lable in two higher LED der ambient flow through by the input ross R1 and continues to ate of decay o the sense er threshold, nt set by the and 2.5V); higher than

HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER AL8807 Document number: DS35281 Rev. 4 - 2 10 of 21 www.diodes.com June 2012 © Diodes Incorporated Applications Information (cont.) PWM Dimming LED current can be adjusted digitally, by applying a low frequency Pulse Width Modulated (PWM) logic signal to the CTRL pin to turn the device on and off. This will pr oduce an average output curren t proportional to the duty cycle of the control signal. In particular, a PWM signal with a max resolution of 10bit can be applied to the CTRL pin to change the output current to a value below the nominal average value set by resistor R SET. To achieve this resolution the PWM frequency has to be lower than 500Hz, however higher dimming frequencies can be used, at the expense of dimming dynamic range and accuracy. Typically, for a PWM frequency of 500Hz the accuracy is better than 1% for PWM ranging from 1% to 100%. Zooming in at duty cycles below 10% shows: The accuracy of the low duty cycle dimming is affected by both the PWM frequency and also the switching frequency of the AL8807. For best accuracy/resolution the switching frequency should be increased while the PWM frequency should be reduced. The CTRL pin is designed to be driven by both 3.3V and 5V logic levels directly from a logic output with either an open drain output or push pull output stage. 0 1 02 03 04 05 06 07 08 09 0 1 0 0 PWM DIMMING (%) Fig. 31 PWM Dimming @ 500Hz LED CURRENT (mA) 700 600 500 400 300 200 100 01 0 3 0 5 0 7 0 9 0 1 00 300Hz PWM DUTY CYCLE (%) Fig. 32 Low Duty Cycle PWM Dimming @ 300Hz DEVIATION FROM IDEAL LOAD CURRENT (%) 4.5 4.0 3.0 2.5 2.0 1.0 0.5 3.5 1.5 V = 12V L = 68µH R = 0.15 T = 25°C S A Ω

HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER AL8807 Document number: DS35281 Rev. 4 - 2 11 of 21 www.diodes.com June 2012 © Diodes Incorporated Applications Information (cont.) Soft Start The AL8807 does not have in-built soft-start action – this prov ides very fast turn off of the output the stage improving PWM dimming accuracy; nonetheless, adding an external capacitor from the CTRL pin to ground will provide a soft-start delay. This is achieved by increasing the time taken for the CTRL voltage to rise to the turn-on threshold and by slowing down the rate of rise of the control voltage at the input of the comparator. Addi ng a capacitor increases the time taken for the output to reach 90% of its final value, this delay is 0.1ms/nF, but will impact on the PWM dimming accuracy depending on the delay introduced. Fig. 33 Soft start with 22nF capacitor on CTRL pin (VIN = 30V, ILED = 667mA, 1 LED) Reducing Output Ripple Peak to peak ripple current in the LED(s) can be reduced, if required, by shunting a capacitor C2 across the LED(s) as shown already in the circuit schematic. A value of 1μF will reduce the supply ripple current by a factor three (approx.). Proportionally lower ripple can be achieved with higher capacitor values. Note that the capacitor will not affe ct operating frequency or efficienc y, but it will increase start- up delay, by reducing the rate of rise of LED voltage. By adding this capacitor the current waveform through the LED(s) changes from a triangular ramp to a more sinusoidal version without altering the mean current value. Capacitor Selection The small size of ceramic capacitors makes them ideal for AL8807 applications. X5R and X7R types are recommended because they retain their capacitance over wider voltage and temperature ranges than other types such as Z5U. A 2.2μF input capacitor is sufficient for most inte nded applications of AL8807; however a 4.7 μF input capacitor is suggested for input voltages approaching 36V.

PN diodes, du It is important the maximum operating volt a diode current. Schottky diod e AL8807 applic Inductor Sel Recommended Higher values which result i n current over th The inductor s pin. The chosen co the required m Suitable coils f The inductor v load current ra r: DS35281 Rev. 4 ons Informa tion efficiency and e maximum op e e to a combina to select parts output load cu age to ensure The power rat es, e.g. B240 cations. lection d inductor valu of inductance n increased ri p he supply voltag hould be moun oil should have mean output cur for use with the Par MSS1038 MSS1038 NPIS64D value should be ange. - 2 ation (cont. performance, erating voltage ation of lower fo with a peak cu rrent. In partic safe operatio n ting is verified b or B140, with es for the AL88 are recommen pple and lowe r ge range. (See Fig. 34 Indu nted as close to a saturation cu rrent. e AL8807 are li rt No. 8-333 8-683 D330MTRF e chosen to ma HIGH E ww the rectifier (D e and tempera t orward voltage urrent rating ab cular, it is recom n during the s w by calculating t their low forw a 807 are in the nded at higher r efficiency. Hi g e graphs). ctor value wit o the device as urrent higher th isted in the tab L (µH) D 33 0. 68 0. 33 0. aintain operatin FFICIENCY 12 of 21 ww.diodes.com D1) should be a ture. The Sc h and reduced r bove the peak c mmended to ha witching and a the power loss ard voltage dr o range 33μH to supply voltage gher values o f th input voltag s possible with han the peak o le below: DCR (V) ISA (A) 093 2. 3 213 1. 5 124 1. 1 g duty cycle an Y LOW EM a fast low cap a hottky diode al s recovery time. coil current and ave a diode vo a current ratin g through the di op and fast re v 100μH. es in order to m f inductance a l ge and numbe low resistance output current a AT ) M CoilCraf

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nd switch 'on'/'o MI 36V 1A B acitance Schott so provides b e d a continuous oltage rating at g at least 10 % ode. verse recovery minimize errors lso result in a er of LEDs e/stray inductan and a continuou Manufacturer ft www.coilcraf ww.niccomp.com off' times over t AL BUCK LED © Diodes tky diode with etter efficiency s current rating least 15% high % higher than t y, are the ide a s due to switc h smaller chan g nce connection us current ratin ft.com m the supply volt L8807 DRIVER June 2012 s Incorporated low reverse than silicon higher than her than the the average al choice for hing delays, ge in output s to the SW ng above age and

HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER AL8807 Document number: DS35281 Rev. 4 - 2 13 of 21 www.diodes.com June 2012 © Diodes Incorporated Applications Information (cont.) The following equations can be used as a guide, with reference to Figure 1 - Operating waveforms. Switch ‘On’ time Switch ‘Off’ time () R r RxI V V I Lt SW L S AVGLEDIN ON + +− − Δ= () r RxI V V I Lt L S AVG D LED OFF ++ + Where: L is the coil inductance (H) rL is the coil resistance (Ω)RS is the current sense resistance (Ω) Iavg is the required LED current (A) ΔI is the coil peak-peak ripple current (A) {Internally set to 0.3 x Iavg} VIN is the supply voltage (V) VLED is the total LED forward voltage (V) RSW is the switch resistance (Ω) {=0.5Ω nominal} VD is the diode forward voltage at the required load current (V) Thermal Considerations For continuous conduction mode of operati on, the absolute maximum junction temperature must not be exceeded. The maximum power dissipation depends on several fact ors: the thermal resistance of the IC package θJA, PCB layout, airflow surrounding the IC, and difference between junction and ambient temperature. The maximum power dissipation can be calculated using the following formula: PD(MAX) = (TJ(MAX) − TA) / θJA where TJ(MAX) is the maximum operating junction temperature, TA is the ambient temperature, and θJA is the junction to ambient thermal resistance. The recommended maximum operating junction temperature, T J, is 125°C and so maximum ambient temperature is determined by the AL8807’s junction to ambient thermal resistance, θJA and device power dissipation. θJA, is layout dependent and package dependent; the AL8807W5’s θJA on a 25x25mm single layer PCB with 1oz copper standing in still air is approximately 250°C/W (160°C/W on a four-layer PCB). The maximum power dissipation at TA = 25°C can be calculated by the following formulas: PD(MAX) = (125°C − 25°C) / (250°C/W) = 0.4W for single-layer PCB PD(MAX) = (125°C − 25°C) / (160°C/W) = 0.625W for standard four-layer PCB Figure 35, shows the power derating of the AL8807W5 on two ( one single-layer and four-layer) different 25x25mm PCB with 1oz copper standing in still air and the AL8807MP on an FR4 51x51mm PCB with 2oz copper standing in still air. -40 -25 -10 5 20 35 50 65 80 90 110 125 AMBIENT TEMPERATURE (°C) Fig. 35 Derating Curve for Different PCB 1600POWER DISSIPATION (mW) 1400 1200 1000 800 600 400 200 SOT25_1 Layer MSOP-8EP SOT25_4 Layer

tracks. After t resonant loop The tracks from C1 should be For PCB trac k handling 1A i n inductance. T capacitance o f than 5nH. r: DS35281 Rev. 4 ons Informa yout Conside s a switching re coupling and la controlling the mise between p e radiated EMI the Schottky d between the S m the SW pin t as short as p o ks a figure of 0 ncreasing the he resonant fre f the Schottky d - 2 ation (cont. erations egulator with fa ayout of the P C switching spee power dissipa t which is due diode reverse r Schottky diode c to the Anode o ossible. There 0.5nH per mm thickness will equency of any diode. An exam Place D1 a Inductor as minimize r F HIGH E ww ast edges and m CB.To help with eds of the inter tion due to s w to an interacti recovery time capacitance an Fig. 36 PC of the Schottky is an inducta n can be used t o have a mino r y oscillation is d mple of good la anode , SW pin and s close as possible t ringing Fig. 37 Reco FFICIENCY 14 of 21 ww.diodes.com measures sma h these effects rnal power MO witching losse s on between t h of around 5ns nd the track ind CB Loop Res y diode, D1, an nce internally i n o estimate the r effect on the determined by ayout is shown VIN SW G N to mmended P Y LOW EM all differential vo the AL8807 h SFET. The ris s and radiated he Schottky di o has occurred ductance, LTRA sonance d then from D 1 n the AL8807 primary reso n inductance a the combined n in figure 37 - t SET CTRLND CB Layout MI 36V 1A B oltages; as a re as been devel se and fall time EMI. The t u ode (D1), Swi t ; the falling e d CK, See figure 1’s cathode to this can be as nant frequency nd length will inductance in the stray track AL BUCK LED © Diodes esult of this car oped to minim es are controlle urn-on edge (f a tching MOSF E dge of the S W 36. the decoupling sumed to be a . If the track i s dominate the the track and t inductance sho L8807 DRIVER June 2012 s Incorporated re has to be ise radiated ed to get the alling edge) ET and PCB W pin sees a g capacitors around 1nH. s capable of size of the the effective ould be less

HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER AL8807 Document number: DS35281 Rev. 4 - 2 15 of 21 www.diodes.com June 2012 © Diodes Incorporated Applications Information (cont.) Recommendations for minimising radiated EMI and other transients and thermal considerations are: 1. The decoupling capacitor (C1) has to be placed as close as possible to the V IN pin and D1 Cathode 2. The freewheeling diode’s (D1) anode, the SW pin and the inductor have to be placed as close as possible to each other to avoid ringing. 3. The Ground return path from C1 must be a low impeda nce path with the ground plane as large as possible 4. The LED current sense resistor (R1) has to be placed as close as possible to the VIN and SET pins. 5. The majority of the conducted heat from the AL8807 is through the GND pin 2. A maximum earth plane with thermal vias into a second earth plane will minimise self-heating 6. To reduce emissions via long leads on the supply input and LEDs low RF impedance capacitors (C2 and C5) should be used at the point the wires are joined to the PCB A Typical application for the AL8807 is an LED MR16 lamp (schematic shown in Figure 38). Fig. 38 MR16 Circuit Schematic An evaluation board for the AL8807 (named the AL8807EV2) for MR16 is available on request from your local Diodes’ sales representative. This board follows Diodes ’ recommendations for low EMI. Images of the top layer and bottom layers are shown in Figure 39. Fig. 39 Recommended MR16 PCB Layout

HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER AL8807 Document number: DS35281 Rev. 4 - 2 16 of 21 www.diodes.com June 2012 © Diodes Incorporated Applications Information (cont.) The associated EMI measurements for this board using the AL8807 is shown in figure 40. Fig 40. AL8807EV2 Radiated EMI Performance The EMI performance was measured at 12VDC driving two white LEDs (VF = 3.1V at 660mA) on the AL8807EV2. The red bold line is for EN55022 class B used for domestic equipment includin g lighting. The bottom magenta li ne is the noise floor of the test chamber. The middle purple line is the EMI emitted radiation of the AL8807 over 30MHz to 1000MHz. This shows that the AL8807 passes the standard with at least 16dB margin. MR16 lamps typically operate from 12V DC or 12V AC, using conventional electromagnetic transformers or electronic transformers. In enclosed lamps such MR16 the ability for the device to operate at high ambient temperatures is critical and figure 41 shows the surface temperature of the AL8807 on AL8807EV2 in operation under the sa me conditions as the EMI tests at an free air temperature of 25ºC. It is antic ipated that the internal junc tion temperature is approximatel y 6 ºC hotter than the surface temperature. Fig 41. Thermal picture of AL8807EV2 at 12VDC 2 white LEDS at 660mA The thermal image shows that components increasing the boar d temperature are the inductor, Schottky diodes and the AL8807.

HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER AL8807 Document number: DS35281 Rev. 4 - 2 17 of 21 www.diodes.com June 2012 © Diodes Incorporated Applications Information (cont.) An inductor choice of 33µH with saturation current higher than 1.1A, will limit the frequenc y variation between 180kHz and 400kHz over the whole input voltage variation (8V to 18V), and therefore represent the best choice for an MR16 solution also taking into account the size constraint of the lamp. The AL8807 guarantees high performance levels with both 12VAC and 12VDC power supplies. The efficiency is generally higher than 81% and current regulation is better than 0.1mA/V in for a DC input voltage in the range from 8V to 18V.

HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER AL8807 Document number: DS35281 Rev. 4 - 2 18 of 21 www.diodes.com June 2012 © Diodes Incorporated

Ordering Information

Device Status Package Code Packaging (Note 8) 7” Tape and Reel Quantity Part Number Suffix AL8807W5-7 New Product W5 SOT25 3000/Tape & Reel -7 AL8807MP-13 New Product MP MSOP-8EP 2500/Tape & Reel -13 Notes: 8. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at: http://www.diodes.com/datasheets/ap02001.pdf . Marking Information (1) SOT25 1 2 3 XX Y W X (Top View) XX : Identification code W : Week : A~Z : 1~26 week; X : A~Z : Internal code Y : Year 0~9 a~z : 27~52 week; z represents 52 and 53 week Part Number Package Identification Code AL8807W5-7 SOT25 B6 (2) MSOP-8EP Part Number Package AL8807MP-13 MSOP-8EP Package Packing W5 : SOT25 MP : MSOP-8EP 7 : 7” Tape & Reel 13 : 13” Tape & Reel AL8807 XX - XX AL8807 Y W X E 1234 8765 Logo Part Number a~z : Lead Free A~Z: Green MSOP-8EP Y : Year : 0 - 9 W : Week : A~Z : 1 ~ 26 week; a~z : 27~52 week z represents 52 and 53 week

HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER AL8807 Document number: DS35281 Rev. 4 - 2 19 of 21 www.diodes.com June 2012 © Diodes Incorporated Package Outline Dimensions (All Dimensions in mm) (1) Package Type: SOT25 (2) MSOP-8EP SOT25 Dim Min Max Typ A 0.35 0.50 0.38 B 1.50 1.70 1.60 C 2.70 3.00 2.80 D ⎯ ⎯ 0.95 H 2.90 3.10 3.00 J 0.013 0.10 0.05 K 1.00 1.30 1.10 L 0.35 0.55 0.40 M 0.10 0.20 0.15 N 0.70 0.80 0.75 α 0° 8° ⎯ All Dimensions in mm 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 A M J LD B C H K N D A E e y x Seating Plane Gauge Plane L D 8Xb See Detail C Detail C c a 4X10° 4X10° 0.25

HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER AL8807 Document number: DS35281 Rev. 4 - 2 20 of 21 www.diodes.com June 2012 © Diodes Incorporated Suggested Pad Layout 1) Package Type: SOT25 2) MSOP-8EP Dimensions Value (in mm) Z 3.20 G 1.60 X 0.55 Y 0.80 C1 2.40 C2 0.95 Dimensions Value (in mm) C 0.650 G 0.450 X 0.450 X1 2.000 Y 1.350 Y1 1.700 Y2 5.300 X Z Y C2C2 G G X C Y Y2 Y1

HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER AL8807 Document number: DS35281 Rev. 4 - 2 21 of 21 www.diodes.com June 2012 © Diodes Incorporated 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). Diodes Incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability ari sing out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applica tions shall assume all risks of such use and will agree to hold Diodes In corporated and all the companies w hose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability what soever in respect of any products purchased through unauthoriz ed sales channel. Should Customers purchase or use Diodes In corporated products for any unintended or unauthorized application, Customers shall i ndemnify and hold Diodes Incorporated and its representatives harmless agai nst all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when prop erly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible fo r all legal, regulatory and safety -related requirements concerning their products and any use of Diodes Incorporated products in such safety-cri tical, life support devices or systems, notwithstanding any devic es- 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 aris ing out of the use of Diodes Incorporated products in such safety-critical, life su pport devices or systems. Copyright © 2012, Diodes Incorporated www.diodes.com