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MS1003SH Datasheet(PDF) 3 Page - Shindengen Electric Mfg.Co.Ltd |
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MS1003SH Datasheet(HTML) 3 Page - Shindengen Electric Mfg.Co.Ltd |
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3 / 41 page ![]() MS1003SH・MS1004SH Application Note Ver.2.2 SHINDENGEN ELECTRIC MFG. CO. , LTD 3/41 Contents 1. Overview … 4 4. Pin functions … 17 1.1 Introduction … 4 4.1 Z/C pin … 17 1.2 Characteristics … 4 4.2 F/B pin … 17 1.3 Applications … 4 4.3 GND pin … 17 1.4 Appearance and dimensions … 4 4.4 OCL pin … 17 1.5 Basic circuit configuration … 5 4.5 VG pin … 17 2. Block diagram … 6 4.6 Vcc pin … 17 2.1 Block diagram … 6 4.7 Vin pin … 17 2.2 Pin names … 6 5. Design procedure … 18 3. Circuit operation … 7 5.1 Design flow chart … 18 3.1 Startup … 7 5.2 Example of main transformer design conditions … 19 3.1.1 Startup circuit … 7 5.3 Formulas for main transformer design … 19 3.1.2 Soft start … 8 5.4 Checking the operating points … 21 3.1.3 Bias assist … 8 5.4.1 Variables in formulas … 22 3.2 Oscillation … 9 3.2.1 On-trigger circuit … 9 5.4.2 Formulas for obtaining trough skip start power … 22 3.2.2 Quasi-resonance … 9 3.2.3 Soft drive … 10 5.4.3 Formulas for obtaining trough skip end power … 22 3.2.4 Trough skip operation … 10 3.2.5 Output voltage control … 11 5.4.4 Formulas for obtaining auto burst start/end power … 24 3.3 Burst mode oscillation … 11 3.3.1 AutoStby function … 11 5.4.5 Formulas for obtaining droop point power … 24 3.3.2 Super standby mode … 13 5.5 Pin design … 27 3.4 Protection functions … 14 5.5.1 Design procedure for the Z/C pin (Pin 1) … 27 3.4.1 Vcc overvoltage protection latch … 14 5.5.2 Design procedure for F/B pin … 29 3.4.2 Overcurrent protection … 14 5.5.3 Design of OCL pin … 30 3.4.3 Overload protection (timer latch function) … 15 5.5.4 Design of VG pin … 31 3.4.4 VCC-GND short circuit protection … 16 5.5.5 Design of Vcc pin … 32 3.4.5 Leading edge blank (LEB) 16 5.5.6 Setting resonating capacitor … 34 3.4.6 On-trigger malfunction prevention circuit … 16 6. Example circuit diagram … 35 3.4.7 TSD … 16 6.1 Circuit diagram … 35 6.2 Calculations for example circuit design … 35 |
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