CRD1680-7W CRD1680-7W 7 Watt Reference Design Features General Description • Constant-current Output • Rated Output Power: 5.6W The CRD1680-7W reference design demonstrates the performance of the CS1680 dimmable LED driver for low-voltage lighting with a target output of 430mA driving 4 LEDs in series. It provides exceptional single-lamp and multi-lamp transformer compatibility for non-dimmer systems and dimmer systems paired with electronic and magnetic low-voltage transformers.
CRD1680-7W IMPORTANT SAFETY INSTRUCTIONS Read and follow all safety instructions prior to using this demonstration board. This Engineering Evaluation Unit or Demonstration Board must only be used for assessing IC performance in a laboratory setting. This product is not intended for any other use or incorporation into products for sale. This product must only be used by qualified technicians or professionals who are trained in the safety procedures associated with the use of demonstration boards.
CRD1680-7W 1. INTRODUCTION The CS1680 is a cascade boost-buck dimmable LED controller IC. The CS1680 uses a Cirrus Logic proprietary intelligent digital control that provides exceptional single-lamp and multi-lamp transformer compatibility for nondimmer systems and dimmer systems paired with electronic and magnetic low-voltage transformers.
120OHM@100MHz FB1 15uH 2 0 R9 93.1 R18 R10 604K 3 C B.2 Changing the silicon to B1 and some components values 1153 C.0 ADDED R11 & C12 1165 D.0 ADDED R12 & R16. CHANGED D11/D13,U2,R11,C12 1194 E.0 change C12 from SMD0805 To through hole TDK FK16X7R1H105K 03/11/14 1225 F CHANGES TO COMPLY WITH RADIATED EMI 07/11/14 1235 F1 CHANGED FB1,FB2 AND R102 08/12/14 08/07/13 09/10/13 10/08/13 11-19-13 12/16/13 B C17 X7R 10uF 93.1 R7 Q5 PMBT4401,215 C7 X7R 4.7uF + R15 35.
CRD1680-7W 3. BILL OF MATERIALS BOM: CRD1680-7W-Z Rev: F1 Date Generated: 08/14/2014 Line Item Description Qty UM Reference Designator 0002 CAP 10uF ±10% 25V X7R NPb 1206 2 EA C1 C10 0003 CAP 27pF ±5% 50V C0G NPb 0603 1 EA C2 0004 CAP 0.10uF 10% 25V X7RLESR NPb 0603 4 EA C3 C4 C5 C14 0005 CAP 180uF ±20% 35V AL ELEC NPb RAD 1 EA C6 0006 CAP 4.
4. BOARD LAYOUT CRD1680-7W DS1017RD3 Figure 3.
DS1017RD3 7 CRD1680-7W Figure 4.
CRD1680-7W DS1017RD3 Figure 5.
DS1017RD3 9 CRD1680-7W Figure 6.
CRD1680-7W DS1017RD3 Figure 7.
DS1017RD3 CRD1680-7W 11 Figure 8.
CRD1680-7W DS1017RD3 Figure 9.
CRD1680-7W 5. THERMAL IMAGING Figure 10. Top Thermal Figure 11.
CRD1680-7W 6. DIMMER COMPATIBILITY The boost stage is a low-side asynchronous boost converter. Once the CS1680 reaches its UVLO start threshold and begins normal operation, the CS1680 controller executes a dimmer switch detection algorithm to set the operating state of the IC. Table 1 summarizes the system operating state that produced the empirical dimmer compatibility results. MR16 Lamp with a CS1680 (12VAC) Date 09/09/2013 Power Factor1,6 0.
DS1017RD3 6.1 120VAC Dimmer Compatibility Table 1 reports the empirical dimmer compatibility results when detectable inputs to the dimmer compatibility circuit are generated using a 120VAC transformer paired with a leading-edge or trailing-edge dimmer.
6.2 230VAC Dimmer Compatibility Table 2 reports the empirical dimmer compatibility results when detectable inputs to the dimmer compatibility circuit are generated using a 230VAC transformer paired with a leading-edge or trailing-edge dimmer. Table 2: 230VAC, 50Hz Mains Power System HPM CAT400L Leading Edge Dimmer1 Flicker Free2 Steady-State Transformer3 # of lamps 1 3 6 Niko 320-00001 Y Y Y Osram Parrot 105 Y Philips S60 Y Primaline 105 Y Tridonic Possum Y Notes: 1.
CRD1680-7W 7. INDUCTOR CONSTRUCTION The CS1680 integrates a continuous conduction mode (CCM) boost converter that provides transformer compatibility and dimmer compatibility with a constant output current buck stage. The following sections describe the boost and buck inductors installed on the CRD1680-7W. 7.
CRD1680-7W 8. PERFORMANCE PLOTS (120VAC) 0.5 Output Current (A) 0.4 Mode 2 Mode 1 0.3 Mode 3 0.2 0.1 Mode 1 - Hatch LS1250EN w/Leading-edge Waveform Mode 2 - Lightech LET60 w/Trailing-edge Waveform Mode 3 - Lightech LET60 w/Leading-edge Waveform 0 20 40 60 80 100 120 140 160 180 Dim Angle (o) Figure 12. Typical CRD1680-7W Output Current vs.
CRD1680-7W 1.0 Output Current (A) 0.8 0.6 Magnetic Transformer 0.4 Electronic Transformer 0.2 Magnetic Transformer - Hatch LS1250EN Electronic Transformer - Lightech LET60 0.0 108 112 116 120 124 128 132 Line Voltage (V) Figure 14. CRD1680-7W Output Current vs.
CRD1680-7W 1.00 Magnetic Transformer 0.95 Power Factor 0.90 0.85 Electronic Transformer 0.80 0.75 0.70 0.65 Magnetic Transformer - Hatch LS1250EN Electronic Transformer - Lightech LET60 0.60 108 112 116 120 124 128 132 Line Voltage (V) Figure 16. CRD1680-7W Power Factor vs.
CRD1680-7W Figure 17. No-dimmer CRD1680-7W Output Mode1, Steady-state Figure 18.
CRD1680-7W Figure 19. Maximum CRD1680-7W Output Mode2, Steady-state Figure 20.
CRD1680-7W Figure 21. CRD1680-7W Output Current at Minimum Dim Angle, Mode1, Turn-on Waveforms Figure 22.
CRD1680-7W Figure 23. CRD1680-7W Output Current at Minimum Dim Angle, Mode2, Turn-on Waveforms Figure 24.
CRD1680-7W Figure 25. CRD1680-7W Output Current at Minimum Dim Angle, Mode3, Turn-on Waveforms Figure 26.
CRD1680-7W 9. PERFORMANCE PLOTS (230VAC) 0.5 Output Current (A) 0.4 Mode 1 Mode 3 Mode 2 0.3 0.2 0.1 Mode 1 - Niko 320-0001 w/Leading-edge Waveform Mode 2 - Parrot 105 w/Trailing-edge Waveform Mode 3 - Parrot 105 w/Leading-edge Waveform 0 20 40 60 80 100 120 Dim Angle 140 160 180 (o) Figure 27. Typical CRD1680-7W Output Current vs.
CRD1680-7W 1.0 0.8 Output Current (A) 0.6 Magnetic Transformer 0.4 Electronic Transformer 0.2 Magnetic Transformer - Niko 320-0001 Electronic Transformer - Parrot 105 0.0 208 212 216 220 224 228 232 236 240 244 248 252 Line Voltage (V) Figure 29. CRD1680-7W Output Current vs.
CRD1680-7W 1 Magnetic Transformer 0.95 Power Factor 0.9 0.85 Electronic Transformer 0.8 0.75 0.7 0.65 Magnetic Transformer - Niko 320-0001 Electronic Transformer - Parrot 105 0.6 208 212 216 220 224 228 232 236 240 244 248 252 Line Voltage (V) Figure 31. CRD1680-7W Power Factor vs.
CRD1680-7W 10. CONDUCTED EMI Device Under Test: CRD1680-7W-Z Operating Conditions: 230V 50Hz Test Specification: IEC 61000-3-2 Operator Name: DLP Scan Settings (1 Range) Frequencies Receiver Settings Start Stop Step Res BW M-Time Atten Preamp 150kHz 30MHz 4.5kHz 9kHz (6dB) 50ms Auto Off Final Measurement Detectors: PK+, AV Peaks: 8 Meas Time: 1s Acc. Margin: 12dB Figure 32.
CRD1680-7W 11. RADIATED EMI Device Under Test: CRD1680-7W-Z Operator Name: DLP Test Specification: CISPR 16-1-4:2007 EN55022 Compliant (Y/N): Y Antenna Orientation: Horizontal/Vertical Frequency Range: 30MHz to 1GHz EUT Line Voltage: 230 VAC EUT Power Frequency: 50Hz Final Measurement Figure 33. CRD1680-7W Radiated EMI - Horizontal Polarity Figure 34.
CRD1680-7W 12.
