SY5862FAC

Application Notes: AN_SY5862 Adaptive LED Current Filter For LED Lighting Preliminary Specification General Description Features The SY5862 is an adaptive linear current regulator to eliminate low frequency current ripple targeting at LED lighting applications. • Current filter for single stage LED driver to eliminate current ripple • Proprietary scheme for low power loss ≤2.5% • Adaptive for wide output speculation： Output voltage range from 20V to 60V Output current≤1A • Open LED Protection and Short LED protection • Reliable short LED and Open LED protection • Compact package: SO8 SO8E TO252-3 It is applied as a current filter to the output of a LED driver, especially single stage LED driver. It adopts adaptive control scheme and no additional electrical design is needed. Reliable open/short LED protection and over thermal protection are all provided. fo r Applications Ordering Information ar ed • LED lighting Tempera ture Code Packa ge Code Optional Spec Code Sil er gy Co rp .C on Typical Applications Note ---------- en Package type SO8 SO8E TO252-3 fid Ordering Number SY5862FAC SY5862FCC SY5862JAC tia l-P re p SY5862 □(□□)□ Figure 1. Schematic Diagram AN_SY5862Rev.0.1 Silergy Corp. Confidential-Prepared for Customer Use Only 1 AN_SY5862 Pinout (top view) (SO8) tia l-P re p ar ed fo r (SO8E) (TO252-3) Sil er gy Co rp .C on fid en Top Mark: AYExyz for SY5862FAC (device code: AYE, x=year code, y=week code, z= lot number code) AXRxyz for SY5862FCC (device code: AXR, x=year code, y=week code, z= lot number code) AYDxyz for SY5862JAC (device code: AYD, x=year code, y=week code, z= lot number code) Pin Name Pin Description LEDN Cathode of LED string. VIN Power Supply NC NC. GND Ground pin AN_SY5862Rev.0.1 Silergy Corp. Confidential-Prepared for Customer Use Only 2 AN_SY5862 Absolute Maximum Ratings fo r (Note 1) VIN --------------------------------------------------------------------------------------------------------------------- -0.3V~60V LEDN --------------------------------------------------------------------------------------------------------------------- -0.3~60V Power Dissipation, @ TA = 25°C SO8--------------------------------------------------------------------------------------0.6W Power Dissipation, @ TA = 25°C SO8E------------------------------------------------------------------------------------3.3W Power Dissipation, @ TA = 25°C TO-252-----------------------------------------------------------------------------------TBD Package Thermal Resistance (Note 2) SO8, θ JA ----------------------------------------------------------------------------------------------------------88°C/W SO8, θ JC ----------------------------------------------------------------------------------------------------------45°C/W SO8E, θ JA --------------------------------------------------------------------------------------------------------30°C/W SO8E, θ JC --------------------------------------------------------------------------------------------------------10°C/W TO252-3, θ JA --------------------------------------------------------------------------------------------------------TBD TO252-3, θ JC --------------------------------------------------------------------------------------------------------TBD Junction Temperature Range ---------------------------------------------------------------------------------- -40°C to 150°C Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------------- 260°C Storage Temperature Range ----------------------------------------------------------------------------------- -65°C to 150°C ar ed Recommended Operating Conditions Sil er gy Co rp .C on fid en tia l-P re p VIN, LEDN -------------------------------------------------------------------------------------------------------------- 20V~60V AN_SY5862Rev.0.1 Silergy Corp. Confidential-Prepared for Customer Use Only 3 AN_SY5862 Electrical Characteristics (VIN = 12V, TA = 25°C unless otherwise specified) Parameter Power Supply Section VIN turn-on threshold VIN turn-off threshold VIN operating current Thermal Section Thermal Shutdown Temperature Thermal Shutdown Temperature Thermal Hysteresis Temperature Symbol Test Conditions Min VVIN,ON VVIN,OFF IVIN TSD1 TSD2 THYS VLEDN 15V Typ Max Unit 10 7.8 77 V V µA 150 100 20 C C C Note 1: Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Sil er gy Co rp .C on fid en tia l-P re p ar ed fo r Note 2: ſJA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Test condition: Device mounted on 2” x 2” FR-4 substrate PCB, 2oz copper, with minimum recommended pad on top layer and thermal vias to bottom layer ground plane. AN_SY5862Rev.0.1 Silergy Corp. Confidential-Prepared for Customer Use Only 4 AN_SY5862 Operation The SY5862 is an adaptive linear current regulator to eliminate low frequency current ripple targeting at LED lighting applications. It is applied as a current filter to the output of a LED driver, especially single stage LED driver. It adopts adaptive control scheme and no additional electrical design is needed. fo tia l-P re p Applications Information ar ed SY5862 provides reliable protections such as Short LED Protection (SLP), Open LED Protection (OLP), Over Temperature Protection (OTP). . SY5862 is available with SO8, SO8E and TO252-3. r It is adaptive for wide output speculation, the output voltage is ranging from 20V to 60V; the maximum output current is 1A. It adopts proprietary scheme for low power loss and the efficiency loss is no more than 2.5%. It also can be operated in parallel to support higher LED current. Start up .C on fid en When VVIN rises up over VVIN-ON, SY5862 starts to work. At first, it has 250ms blanking time without current filter function to build up stable reference internally. Then the LED current ripple is decreased by SY5862 gradually. Shut down Co rp When VVIN drops below VVIN-OFF, LEDN Pin is high impedance to GND Pin. Parallel operation application Sil er gy SY5862 can be operated in parallel to support higher LED current. The circuit is shown in below. Fig. Parallel circuit AN_SY5862Rev.0.1 Silergy Corp. Confidential-Prepared for Customer Use Only 5 AN_SY5862 0.60 4.80 - 5.00 1.40 - 1.60 tia l-P re p 0.25 base en ° -8 fid 0 45° 0.25 - 0.50 0.18 - 0.25 Recommended Pad Layout 1.27 (TYP) .C on 0.60 - 0.85 0.30 – 0.50 0.08 - 0.25 ar ed fo r 5.40 3.80 - 4.00 1.27 TYP 5.80 - 6.20 6.10 1.55 SO8 Package Outline & PCB Layout Design Sil er gy Co rp Notes: All dimensions are in millimeters. All dimensions don’t include mold flash & metal burr. AN_SY5862Rev.0.1 Silergy Corp. Confidential-Prepared for Customer Use Only 6 AN_SY5862 tia l-P re p ar ed fo r SO8-E Package Outline & PCB layout 0.60 - 0.85 00.00 - 0.25 4.80 - 5.00 1.30 - 1.60 0.25 base 0.18 - 0.25 fid .C on ° -8 1.27 (TYP) Side view er gy Co rp 0 45° 0.25 - 0.50 Top view en Recommended Pad Layout Sil Notes: All dimension in MM All dimension don’t not include mold flash & metal burr AN_SY5862Rev.0.1 Silergy Corp. Confidential-Prepared for Customer Use Only 7 AN_SY5862 ar ed fo r TO252-3 Package Outline & PCB layout Bottom view Sil er gy Co rp .C on fid en tia l-P re p Top view Side view Notes: All dimension in MM and exclude mold flash & metal burr AN_SY5862Rev.0.1 Silergy Corp. Confidential-Prepared for Customer Use Only 8