Schematic 2014 Fairchild Semiconductor Corporation 2 RD-479 Rev. 1.0

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1 Fairchild Reference Design RD The following reference design supports inclusion of FSQ0365 in design of an auxiliary power supply. It should be used in conjunction with the FSQ0365 datasheet as well as Fairchild s application notes and technical support team. Please visit Fairchild s website at Application Fairchild Device Input Voltage Range Rated Output Power Output Voltage (Rated Current) Topology Auxiliary Power FSQ0365RN V AC 20 W Cont 46 W Peak 12 V (0.95 A, 2.7 A peak) 5 V (0.21A, 0.3 A Peak) 19V (0.2 A) Quasi Resonant SSR Flyback Key Features Optimized for Valley Switching (VSC) Low EMI through Variable Frequency Control and Inherent Frequency Modulation High Efficiency through Minimum Voltage Switching Narrow frequency Variation Range over Wide Load and Input Voltage Variation Advanced Burst-Mode Operation for Low Standby Power Consumption Pulse-by-Pulse Current Limit Various Protection functions: Over Load Protection(OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) Under Voltage Lock Out (UVLO) with Hysteresis Internal Start-up Circuit Internal High-Voltage Sense FET (650V) Built-in Soft-Start (15ms) 2014 Fairchild Semiconductor Corporation 1 RD-479 Rev. 1.0

2 1. Schematic Figure 1. Schematic 2014 Fairchild Semiconductor Corporation 2 RD-479 Rev. 1.0

3 2. Transformer 2.1. Transformer Schematic Diagram z Figure 2. Transformer Configuration and Winding Stackup 2.2. Winding Specification Windings Pins (S F) Strands x Wire ø Turns Layers Winding Method W1a x mm 71 2 Spaced W x0.4 mm 12 2 Spaced W x 0.35 mm 5 1 Spaced W x 0.35 mm 18 2 Spaced W x 0.35 mm 18 2 Spaced W1b x mm 71 2 Spaced W x mm 13 1 Spaced Note: W4 and W5 are wound bifilar on one Layer Core: EER28 Material: PC40 (TDK) or equivalent Bobbin: EER28 horizontal / 15 pins, Pinshine Gap in center leg: approx. 0.8 mm for A L of 121 nh/turns Electrical Characteristics Pin Specification Remark Inductance mh +/-5% 10 khz, 100 mv Leakage 1 3 < 60 µh Short all secondaries 2014 Fairchild Semiconductor Corporation 3 RD-479 Rev. 1.0

4 3. Bill of Materials Ref Des Qty Description Manufacturer Manf. P/N Package R101 1 Resistor, metal oxide, 62K, 1W, 5% 1 W R102 1 Resistor, SMT, 0805, 49.9K, 1% 0805 R103 1 Resistor, SMT, 0805, 51K, 5% 0806 R201 1 Resistor, SMT, 0805, 27.4K, 1% 0807 R202 1 Resistor, SMT, 0805, 5.11K, 1% 0808 R203 1 Resistor, SMT, 0805, 2K, 5% 0809 R204 1 Resistor, SMT, 0805, 5.1K, 5% 0810 C101 1 Capacitor, Al. El., 10uF, 400V, 105C, 20% Chemi-Con KMG series C102 1 Capacitor, Ceramic disc, 3.3nF, 1KV, 20% C103 1 Capacitor, MLCC, 100nF, 50V, 10%, X7R, C104 1 Capacitor, Al. El., 22uF, 50V, 105C, 20% Nichicon PW series C105 1 Capacitor, MLCC, 1nF, 50V, 10%, X7R, C201 1 Capacitor, Al. El., 120uF, 16V, 105C, 20%, 405mA Chemi-Con KZE series 6.3x11mm C202 1 Capacitor, Al. El., 470uF, 25V, 105C, 20%, 1430mA Chemi-Con KZE series 10x16mm T101 1 Transformer, 15W, EF20, PC47, 1.15mH, 10- pin hrz. Custom TBH EF-20H D101 1 Diode, fast rectifier, 1A, 1000V Fairchild RGP10M DO-41 D201 1 Diode, ultrafast rectifier, 1A, 150V Fairchild EGP10C DO-41 D202 1 Diode, ultrafast rectifier, 3A, 200V Fairchild EGP10D DO-201AD U101 1 IC, PWM, intg. FET, intg. Er. Amp., 650V, 50kHz Fairchild FSL336LRN DIP Fairchild Semiconductor Corporation 4 RD-479 Rev. 1.0

5 4. Performance 4.1. Standby Power The input power for various input voltages was measured with no load. The standby power was calculated as PStdby = PIN POUT. Figure 3. Standby power plotted against input voltage V IN [V RMS ] P Stdby [W] Accuracy of Output Voltages With No Load The minimum and maximum values in the table below are calculated as deviations from the specified output voltage. V IN [V RMS ] Min [%] Max [%] V1 [12 V] V2 [5 V] V3 [19 V] V4 [19 V] Fairchild Semiconductor Corporation 5 RD-479 Rev. 1.0

6 4.2. Full Load Efficiency Figure 4. Efficiency plotted against Input Voltage V IN [V RMS ] P OUT [W] P IN [W] Efficiency [%] Fairchild Semiconductor Corporation 6 RD-479 Rev. 1.0

7 5. Related Resources FSQ0365RN Product Folder ` Reference Design Disclaimer Fairchild Semiconductor Corporation ( Fairchild ) provides these reference design services as a benefit to our customers. Fairchild has made a good faith attempt to build for the specifications provided or needed by the customer. Fairchild provides this product as is and without recourse and MAKES NO WARRANTY, EXPRESSED, IMPLIED OR OTHERWISE, INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Customer agrees to do its own testing of any Fairchild reference designs in order to ensure design meets the customer needs. Neither Fairchild nor Customer shall be liable for incidental or consequential damages, including but not limited to, the cost of labor, requalifications, rework charges, delay, lost profits, or loss of goodwill arising out of the sale, installation or use of any Fairchild product. Subject to the limitations herein, Fairchild will defend any suit or proceeding brought against Customer if it is based on a claim that any product furnished hereunder constitutes an infringement of any intellectual property rights. Fairchild must be notified promptly in writing and given full and complete authority, information and assistance (at Fairchild s expense) for defense of the suit. Fairchild will pay damages and costs therein awarded against Customer but shall not be responsible for any compromise made without its consent. In no event shall Fairchild s liability for all damages and costs (including the costs of the defense by Fairchild) exceed the contractual value of the products or services that are the subject of the lawsuit. In providing such defense, or in the event that such product is held to constitute infringement and the use of the product is enjoined, Fairchild, in its discretion, shall procure the right to continue using such product, or modify it so that it becomes noninfringing, or remove it and grant Customer a credit for the depreciated value thereof. Fairchild s indemnity does not extend to claims of infringement arising from Fairchild s compliance with Customer s design, specifications and/or instructions, or the use of any product in combination with other products or in connection with a manufacturing or other process. The foregoing remedy is exclusive and constitutes Fairchild s sole obligation for any claim of intellectual property infringement and Fairchild makes no warranty that products sold hereunder will not infringe any intellectual property rights. All solutions, designs, schematics, drawings, boards or other information provided by Fairchild to Customer are confidential and provided for Customer s own use. Customer may not share any Fairchild materials with other semiconductor suppliers Fairchild Semiconductor Corporation 7 RD-479 Rev. 1.0