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MC34063ADR Datasheet(PDF) 11 Page - Texas Instruments |
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MC34063ADR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 30 page R2 1.25 1 R1 æ ö - + ç ÷ è ø ( ) out on ripple pp I t 9 V ( ) ( ) ( ) ( ) sat in min on max pk switch V V t I æ ö - ç ÷ ç ÷ ç ÷ è ø ( ) pk switch 0.3 I ( ) on out max off t 2I 1 t æ ö + ç ÷ è ø 5 on 4 10 t - ´ ( ) on off off t t t + - on off on off t t t 1 t + + 1 f out F in sat V V V V + - MC33063A, MC34063A www.ti.com SLLS636N – DECEMBER 2004 – REVISED JANUARY 2015 Typical Application (continued) 9.2.1.1 Design Requirements The user must determine the following desired parameters: Vsat = Saturation voltage of the output switch VF = Forward voltage drop of the chosen output rectifier The following power-supply parameters are set by the user: Vin = Nominal input voltage Vout = Desired output voltage Iout = Desired output current fmin = Minimum desired output switching frequency at the selected values of Vin and Iout Vripple = Desired peak-to-peak output ripple voltage. The ripple voltage directly affects the line and load regulation and, thus, must be considered. In practice, the actual capacitor value should be larger than the calculated value, to account for the capacitor's equivalent series resistance and board layout. 9.2.1.2 Detailed Design Procedure CALCULATION VOLTAGE INVERTING ton/toff (ton + toff) toff ton CT Ipk(switch) RSC L(min) CO Vout See Figure 8 Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: MC33063A MC34063A |
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