SARS01V1

Auxiliary Switch Diodes for Snubber SARS01, SARS05 Data Sheet Description Package The SARS01/05 is an auxiliary switch diode especially designed for snubber circuits, which are used in the primary sides of flyback switched-mode power supplies. Being capable of reducing the ringing voltage generated at power MOSFET turn-off, the SARS01/05-incorporated snubber circuits allow better cross regulation of multiple outputs. The SARS01/05 can also improve power supply efficiency by partially transferring such ringing voltage into the secondary side of a power supply unit. ● SARS01 Axial (φ2.7 × 5.0L / φ0.6) Cathode Mark (1) (2) ● SARS05 SJP (4.5 mm × 2.6 mm) Cathode Mark (2) (1) Features ● Improves Cross Regulation ● Reduces Noise ● Improves Efficiency (1) Applications (2) (1) Cathode (2) Anode For switched-mode power supplies (SMPS) with flyback topology such as: ● White Goods ● Adaptor ● Industrial Equipment Not to scale Selection Guide Typical Application Clamp snubber CS Part Number IF(AV) VF (max.) Package SARS01 1.2 A 0.92 V Axial SARS05 1.0 A 1.05 V SJP RS1 RS2 SARS01/05 Controller AC/DC converter IC SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 1 SARS01, SARS05 Contents Description ------------------------------------------------------------------------------------------------------ 1 Contents --------------------------------------------------------------------------------------------------------- 2 Absolute Maximum Ratings --------------------------------------------------------------------------------- 3 Electrical Characteristics ------------------------------------------------------------------------------------ 3 Mechanical Characteristics ---------------------------------------------------------------------------------- 3 SARS01 Derating Curves ------------------------------------------------------------------------------------ 4 SARS01 Characteristic Curves ----------------------------------------------------------------------------- 4 SARS05 Derating Curves ------------------------------------------------------------------------------------ 6 SARS05 Characteristic Curves ----------------------------------------------------------------------------- 7 SARS01 Physical Dimensions and Marking Diagram -------------------------------------------------- 9 SARS05 Physical Dimensions and Marking Diagram ------------------------------------------------ 10 Operational Comparison of Clamp Snubber Circuits ------------------------------------------------ 12 Power Dissipation and Junction Temperature Calculation ----------------------------------------- 13 Parameter Setting of Snubber Circuit using SARS01/05 -------------------------------------------- 13 Reference Design of Power Supply ----------------------------------------------------------------------- 14 Important Notes ---------------------------------------------------------------------------------------------- 16 SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 2 SARS01, SARS05 Absolute Maximum Ratings Unless otherwise specified, TA = 25 °C. Parameter Symbol Nonrepetitive Peak Reverse Voltage VRSM Repetitive Peak Reverse Voltage VRM Average Forward Current(1) IF(AV) Surge Forward Current IFSM I2t Limiting Value I 2t Junction Temperature Storage Temperature Conditions Rating 800 800 1.2 1.0 110 Half cycle sine wave, positive side, 10 ms, 1 shot Unit V V A A 30 60.5 4.5 −40 to 150 −40 to 150 1 ms ≤ t ≤ 10 ms TJ TSTG A2s Remarks SARS01 SARS05 SARS01 SARS05 SARS01 SARS05 °C °C Electrical Characteristics Unless otherwise specified, TA = 25 °C. Parameter Symbol Forward Voltage Drop VF Reverse Leakage Current IR Reverse Leakage Current under High Temperature H∙IR Reverse Recovery Time trr Thermal Resistance(2) Conditions IF = 1.2 A IF = 1.5 A VR = VRM VR = VRM, TJ = 100 °C IF = IRP = 10 mA, TJ = 25 °C, 90% recovery point IF = IRP = 100 mA, TJ = 25 °C, 90% recovery point Rth(J-L) Min. — — — — Typ. — 0.91 — — Max. 0.92 1.05 10 5 Unit — — 50 µA 2 — 18 V µA Remarks SARS01 SARS05 SARS01 SARS05 SARS01 µs 2 — 19 — — — — 20 20 °C/W SARS01 SARS05 Max. ― ― Unit g g Remarks SARS01 SARS05 SARS05 Mechanical Characteristics Parameter Conditions Min. ― ― TL TL 1.6 mm Package Weight 10 mm Typ. 0.2 0.072 Device TA Device Copper Area 1.6 mm 2 mm 25 mm 2 mm 2 mm Substrate Diameter of soldering area: φ3 mm Cupper thickness: 50 µm 25 mm Figure 1. (1) (2) Lead Temperature Measurement Conditions See the derating curves of each product. Rth(J-L) is thermal resistance between junction and lead. Lead temperature (TL) is measured near the root of pin (see Figure 1). SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 3 SARS01, SARS05 SARS01 Derating Curves 1.2 1.2 1.0 t/T = 1/2 t/T = 1/3, Sinewave t/T = 1/6 Average Forward Current, IF(AV) (A) Average Forward Current, IF(AV) (A) t/T = 1/6 DC 0.8 0.6 0.4 0.2 t 1.0 t/T = 1/3 Sine wave 0.8 t/T = 1/2 DC 0.6 0.4 0.2 t T T 0.0 0.0 100 110 120 130 140 150 100 110 Lead Temperature, TL (°C) 120 130 140 150 Lead Temperature, TL (°C) Figure 2. SARS01 IF(AV) vs. TL (TJ = 150 °C, VR = 0 V) Figure 3. SARS01 IF(AV) vs. TL (TJ = 150 °C, VR = 800 V) 1.2 0.4 t 1.0 t/T = 1/6 T t/T = 1/3, sine wave 0.8 t/T = 1/2 0.6 DC 0.4 0.2 0.0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 Maximum Reverse Power Dissipation, P R(MAX) (W) Maximum Forward Power Dissipation, P F(MAX) (W) SARS01 Characteristic Curves t T 1−t/T = 5/6 0.3 1−t/T = 2/3 0.2 1−t/T = 1/2 0.1 Sine wave 0 0 Average Forward Current, IF(AV) (A) Figure 4. SARS01 PF(MAX) vs. IF(AV) (TJ = 150 °C) 200 400 600 800 Reverse Voltage, VR (V) Figure 5. SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 SARS01 PR(MAX) vs. VR (TJ = 150 °C) 4 SARS01, SARS05 10 1.E-04 TJ = 150 °C 1 Reverse Leakage Current, IR (A) Forward Current, IF (A) TJ = 150 °C 1.E-05 TJ = 100 °C 1.E-06 0.1 TJ = 100 °C 1.E-07 TJ = 25 °C 0.01 1.E-08 TJ = 25 °C 0.001 0.0 0.2 0.4 0.6 0.8 1.0 1.E-09 1.2 0 200 Forward Voltage Drop, VF (V) Figure 6. 400 600 800 Reverse Voltage, VR (V) SARS01 Typical Characteristics: IF vs. VF Figure 7. SARS01 Typical Characteristics: IR vs. VR Thermal Resistance (°C/W) 1000 Rth(J-A) 100 Rth(J-L) 10 1 0.1 10m 100m 1 10 100 1000 Pulse Width (s) Figure 8. SARS01 Typical Transient Thermal Resistance Characteristics SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 5 SARS01, SARS05 SARS05 Derating Curves 1.0 1.0 t/T = 1/3, sine wave 0.9 t/T = 1/2 0.8 Average Forward Current, IF(AV) (A) Average Forward Current, IF(AV) (A) 0.9 t/T = 1/6 0.7 DC 0.6 0.5 0.4 0.3 0.2 t 0.1 T 0.0 100 110 120 130 140 150 t/T = 1/2 0.8 0.7 0.6 Sine wave 0.5 DC 0.4 t/T = 1/3 0.3 0.2 t 0.1 0.0 100 Lead Temperature, TL ( °C) Figure 9. SARS05 IF(AV) vs. TL (TJ = 150 °C, VR = 0 V) t/T = 1/6 T 110 120 130 140 150 Lead Temperature, TL (°C) Figure 10. SARS05 IF(AV) vs. TL (TJ = 150 °C, VR = 800 V) SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 6 SARS01, SARS05 1.4 0.4 t/T = 1/6 t 1.2 Forward Power Dissipation, PR (W) Maximum Forward Power Dissipation, P F(MAX) (W) SARS05 Characteristic Curves T 1.0 t/T = 1/3, sine wave 0.8 0.6 t/T = 1/2 0.4 DC 0.2 t T 1−t/T = 5/6 0.3 1−t/T = 2/3 0.2 1−t/T = 1/2 0.1 Sine wave 0 0.0 0.0 0.2 0.4 0.6 0.8 0 1.0 200 Average Forward Current, IF(AV) (A) Figure 11. SARS05 PF(MAX) vs. IF(AV) (TJ = 150 °C) Figure 12. 10 600 800 SARS05 PR(MAX) vs. VR (TJ = 150 °C) 1.E-05 Reverse Leakage Current, IR (A) Forward Current, IF (A) 400 Reverse Voltage, VR (V) 1 TJ = 150 °C TJ = 100 °C 0.1 0.01 TJ = 150 °C 1.E-06 TJ = 100 °C 1.E-07 1.E-08 TJ = 25 °C 1.E-09 TJ = 25 °C 0.001 0.0 0.5 1.0 1.5 1.E-10 0 200 Forward Voltage Drop, VF (V) Figure 13. SARS05 Typical Characteristics: IF vs. VF 400 600 800 Reverse Voltage, VR (V) Figure 14. SARS05 Typical Characteristics: IR vs. VR SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 7 SARS01, SARS05 Thermal Resistance (°C/W) 1000 Rth(J-A) 100 Rth(J-L) 10 1 0.1 10m 100m 1 10 100 1000 Pulse Width (s) Figure 15. SARS05 Typical Transient Thermal Resistance Characteristics SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 8 SARS01, SARS05 SARS01 Physical Dimensions and Marking Diagram ● SARS01 Physical Dimensions Axial (φ2.7 × 5.0L / φ0.6) 62.3±0.7 Φ2.7±0.2 φ0.6±0.05 5.0±0.2 NOTES: - Dimensions in millimeters Bare leads: Pb-free (RoHS compliant) The allowance position of Body against the center of whole lead wire is 0.5 mm (max.). The centric allowance of lead wire against center of physical body is 0.2 mm (max.). The burr may exit up to 2 mm from the body of lead. When soldering the products, it is required to minimize the working time, within the following limits: Flow: 260 °C, 10 s, 1 time Soldering Iron: 350 °C, 3.5 s, 1 time (Soldering should be at a distance of at least 1.5 mm from the body of the product.) ● SARS01 Marking Diagram Polarity Marking (Cathode band) AR S1 Device Code of SARS01 YM D Lot Number: Y is the last digit of the year of manufacture (0 to 9) M is the month of the year (1 to 9, O, N, or D) D is a period of days: “・” is the first 10 days of the month (1st to 10th) “・・” is the second 10 days of the month (11th to 20th) “・・・” is the last 10–11 days of the month (21st to 31st) NOTE: - Marked in silver-based color SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 9 SARS01, SARS05 SARS05 Physical Dimensions and Marking Diagram ● SARS05 Physical Dimensions 2.15 0.05 +0.1 -0.2 +0.1 -0.05 2.6±0.2 4.5±0.2 1.3±0.4 2.0min. 1.5±0.2 1.3±0.4 +0.4 5.0 -0.1 NOTES: - Dimensions in millimeters Bare lead frame: Pb-free (RoHS compliant) Moisture Sensitivity Level 1 (MSL 1) When soldering the products, it is required to minimize the working time within the following limits: Flow: 260 °C / 10 s, 1 time Reflow: Preheat: 150 °C to 200 °C / 60 s to 120 s Solder heating: 255 °C / 30 s, 3 times (260 °C peak) Soldering iron: 350 °C / 3.5 s, 1 time ● SARS05 Land Pattern Example 2.0 2.0 4.0 to 4.2 NOTE: Dimensions in millimeters SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 10 SARS01, SARS05 ● SARS05Marking Diagram AS05 YMDD Device Code of SARS05 Lot Number: Y is the last digit of the year of manufacture (0 to 9) M is the month of the year (1 to 9, O, N, or D) DD is the day of the month (01 to 31) Polarity Marking (Cathode band) SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 11 SARS01, SARS05 Operational Comparison of Clamp Snubber Circuits Figure 16 shows a general clamp snubber circuit. In the circuit, the surge voltage at tuning off a power MOSFET is charged to CS through the surge absorb loop, and is consumed by RS1 through the energy discharge loop. All the consumed energy becomes loss in RS1. In addition, the ringing of surge voltage results in poor cross regulation of multi-outputs. Figure 19 shows the clamp snubber circuit using the SARS01/05. The surge voltage at tuning off a power MOSFET is charged to CS through the surge absorb loop. Since the reverse recovery time, trr, of the SARS01/05 is a relatively long period, the energy charged to CS is discharged to the reverse direction of the surge absorb loop until CS voltage is equal to the flyback voltage. Some discharged energy is transferred to secondary side. Thus, the power supply efficiency improves. In addition, the power supply using the SARS01/05 reduces the ringing voltage. Thus, the cross regulation of multi-outputs can be improved. Energy discharge loop RS1 CS Energy discharge loop RS1 CS DFRD RS2 ID Controller Surge absorb loop SARS01/05 VDS ID AC/DC converter IC Figure 16. Controller General Clamp Snubber Circuit AC/DC converter IC Figure 19. Clamp Snubber Circuit using SARS01/05 RS1: 570 kΩ CS: 1000 pF DFRD: EG01C VDS ID VDS Figure 17. Surge absorb loop VDS ID RS1: 570 kΩ RS2: 22 Ω CS: 1000 pF SARS: SARS01 Waveforms of General Clamp Snubber Circuit Figure 20. ID Waveforms of Clamp Snubber Circuit using SARS01 VDS ID Figure 18. VDS Enlarged View of Figure 17 Figure 21. SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 Enlarged View of Figure 20 12 SARS01, SARS05 Power Dissipation and Junction Temperature Calculation Figure 22 shows a typical application using the SARS01/05. Figure 23 shows the operating waveforms of the SARS01/05. The power dissipation of the SARS01/05 is calculated as follows: 1) The waveforms of the SARS01/05 voltage, VSARS, and the SARS01/05 current, ISARS, are measured in actual application operation. VSARS × ISARS is calculated by the math function of oscilloscope. 2) The each average energy (P1, P2…Pk) is measured at period of each polarity of VSARS × ISARS (t1, t2,…tk) as shown in Figure 22 by the automatic measurement function of the oscilloscope. 3) The power dissipation of the SARS01/05, PSARS, is calucultaed by Equation (1): PSARS = 1 (|P × t1 | + |P2 × t 2 | + ⋯ |Pk × t k |) T 1 (1) A differential probe is recommended to use for the measurement of VSARS. Please conform to the oscilloscope manual about power dissipation measurement including the delay compensation of probe. In addition, by using the temperature of the SARS01/05 in actual application operation, the estimated junction temperature of the SARS01/05 is calculated by Equation (2). It should be enough lower than TJ of the absolute maximum rating. where: TJ(SARS) is junction temperature of the SARS01/05, TL is lead temperature of the SARS01/05, and θJ-L is thermal resistance between junction to lead. RS1 CS RS2 VSARS(10) VSARS ISARS SARS01/05 t2 t3 … tk P1 P2 P3 … Pk 0 VSARS 0 Energy 0 T Figure 23. SARS01/05 Current Parameter Setting of Snubber Circuit using SARS01/05 The temperature of the SARS01/05 and peripheral components should be measured in actual application operation. The reference values of snubber circuit using the SARS01/05 are as follows: where: PSARS is power dissipation of the SARS01/05, T is switching cycle of power MOSFET (s), and Pk is average energy of period tk (W). TJ(SARS) = TL + θJ−L × PSARS (°C) t1 ISARS (2) ● CS 680 pF to 0.01 μF. The voltage rating is selected according to the voltage subtraced the input voltage from the peak of VDS. ● RS1 RS1 is the bias resistance to turn off the SARS01/05, and is 100 kΩ to 1 MΩ. Since a high voltage is applied to RS1 that has high resistance, the following should be considered according to the requirement of the application: - Select a resistor designed for electromigration, or - Connect more resistors in series so that the applied voltages of individual resistors can be reduced. The power rating of resistor should be selected from the measurement of the effective current of RS1 based on actual operation in the application. ● RS2 RS2 is the limited resistance in the energy discharging. The value of 22 Ω to 220 Ω is connected to the SARS01/05 in series. The power rating of resistor should be selected from the measurement of the effective current of RS2 based on actual operation in the application. Controller AC/DC converter IC Figure 22. Typical Application SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 13 SARS01, SARS05 Reference Design of Power Supply This section provides the information on a reference design, including power supply specifications, a circuit diagram, the bill of materials, and transformer specifications. ● Power Supply Specifications Item Specification Input Voltage 85 VAC to 265 VAC Output Power 34.8 W (40.4 W peak) Output 1 8 V / 0.5 A Output 2 14 V / 2.2 A (2.6 A peak) ● Circuit Schematic 1 F1 L1 D1 D2 D51 T1 VOUT1 (+) C1 D4 3 D3 C3 R1 S1 C2 C51 C52 (-) R2 D52 P1 D5 OUT2 (+) U1 D/ST 5 R54 R51 FB/OLP S2 4 NC C53 6 D/ST GND D6 D/ST VCC D/ST S/OCP 7 R55 3 PC1 R3 2 8 C5 1 R53 D U51 STR3A400 R52 C54 R56 (-) R4 C6 C4 PC1 C7 ● Bill of Materials Symbol Ratings(1) C1(2) Recommended Part No. Symbol Ratings(1) Film, 0.1 μF, 275 V Electrolytic, 150 μF, 400 V Ceramic, 1000 pF, 1 kV Ceramic, 0.01 μF Electrolytic, 22 μF, 50 V Ceramic, 15 pF / 2 kV Ceramic, 2200 pF, 250 V Electrolytic, 680 μF, 25 V Electrolytic, 680 μF, 25 V Electrolytic, 470 μF, 16 V Ceramic, 0.1 μF, 50 V 600 V, 1 A 600 V, 1 A 600 V, 1 A EM01A EM01A EM01A D52 F1 L1(2) PC1 R1(3) R2 R3 R4(2) R51 R52 R53(2) R54(2) R55 R56 D4 600 V, 1 A EM01A T1 D5 D6 D51 800 V, 1.0 A Fast recovery, 200 V, 1.5A Schottky, 60 V, 1.5 A SARS05 SJPX-F2 SJPB-H6 U1 U51 Schottky, 100 V, 20 A Fuse, 250 V AC, 3 A CM inductor, 3.3 mH Optocoupler, PC123 or equiv. Metal oxide, 330 kΩ, 1 W 47 Ω, 1 W 10 Ω 0.47 Ω, 1/2 W 1 kΩ 1.5 kΩ 100 kΩ 6.8 kΩ ± 1%, 39 kΩ ± 1%, 10 kΩ See the Transformer Specification IC Shunt regulator, VREF = 2.5 V C2(2) C3 C4 C5 C6(2) C7(2) C51(2) C52 C53 C54(2) D1 D2 D3 Recommended Part No. FMEN-220A STR3A453D (TL431 or equiv.) (1) Unless otherwise specified, the voltage rating of capacitor is 50 V or less and the power rating of resistor is 1/8 W or less. Refers to a part that requires adjustment based on operation performance in an actual application. (3) High voltage is applied to this resistor that has high resistance. To meet your application requirements, it is required to select resistors designed for electromigration, or to connect more resistors in series so that the applied voltages of individual resistors can be reduced. (2) SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 14 SARS01, SARS05 ● Transformer Specifications Item Primary Inductance, LP Core Size AL Value Winding Specification Winding Structure Specification 518 μH EER-28 245 nH/N2 (with a center gap of about 0.56 mm) See Table 1 See Figure 24 Table 1. Winding Specification Winding Symbol Primary Winding Primary Winding Auxiliary Winding Output 1 Winding Output 1 Winding Output 2 Winding Output 2 Winding P1 P2 D S1-1 S1-2 S2-1 S2-2 Number of Turns (turns) 18 28 12 6 6 4 4 Wire Diameter (mm) φ 0.23 × 2 φ 0.30 φ 0.30 × 2 φ 0.4 × 2 φ 0.4 × 2 φ 0.4 × 2 φ 0.4 × 2 Structure Single-layer, solenoid winding Single-layer, solenoid winding Solenoid winding Solenoid winding Solenoid winding Solenoid winding Solenoid winding 4 mm 2 mm VDC P2 8V D S2-1 S1-1 P2 P1 Pin side S2-2 S1-2 Margin tape Margin tape P1 S1-2 Drain 14 V VCC S2-1 D Bobbin Core S1-1 S2-2 GND GND ● denotes the start of winding. Cross-section View Figure 24. Winding Structure SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 15 SARS01, SARS05 Important Notes ● All data, illustrations, graphs, tables and any other information included in this document (the “Information”) as to Sanken’s products listed herein (the “Sanken Products”) are current as of the date this document is issued. The Information is subject to any change without notice due to improvement of the Sanken Products, etc. Please make sure to confirm with a Sanken sales representative that the contents set forth in this document reflect the latest revisions before use. ● The Sanken Products are intended for use as components of general purpose electronic equipment or apparatus (such as home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). 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DSGN-CEZ-16003 SARSxx-DSE Rev.2.1 SANKEN ELCTRIC CO., LTD. Aug. 17, 2021 http://www.sanken-ele.co.jp/en © SANKEN ELECTRIC CO., LTD. 2015 16