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MC34166 Datasheet(PDF) 15 Page - ON Semiconductor |
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MC34166 Datasheet(HTML) 15 Page - ON Semiconductor |
15 / 18 page MC34166, MC33166 http://onsemi.com 15 Table 1. Design Equations Calculation Step−Down Step−Up/Down Voltage−Inverting ton toff (Notes 1, 2) Vout ) VF Vin * Vsat * Vout Vout ) VF1 ) VF2 Vin * VsatQ1 * VsatQ2 |Vout| ) VF Vin * Vsat ton ton toff fosc ton toff ) 1 ton toff fosc ton toff ) 1 ton toff fosc ton toff ) 1 Duty Cycle (Note 3) ton fosc ton fosc ton fosc IL avg Iout Iout ton toff ) 1 Iout ton toff ) 1 Ipk(switch) ILavg ) DIL 2 ILavg ) DIL 2 ILavg ) DIL 2 L Vin * Vsat * Vout DIL ton Vin * VsatQ1 * VsatQ2 DIL ton Vin * Vsat DIL ton Vripple(pp) DIL 1 8foscCo 2 ) (ESR)2 ton toff ) 1 1 foscCo 2 ) (ESR)2 ton toff ) 1 1 foscCo 2 ) (ESR)2 Vout Vref R2 R1 ) 1 Vref R2 R1 ) 1 Vref R2 R1 ) 1 1. Vsat − Switch Output source saturation voltage, refer to Figure 8. 2. VF − Output rectifier forward voltage drop. Typical value for 1N5822 Schottky barrier rectifier is 0.5 V. 3. Duty cycle is calculated at the minimum operating input voltage and must not exceed the guaranteed minimum DC(max) specification of 0.92. Vout − Iout − DIL − Vripple(pp) − Desired output voltage. Desired output current. Desired peak−to−peak inductor ripple current. For maximum output current especially when the duty cycle is greater than 0.5, it is suggested that DIL be chosen to be less than 10% of the average inductor current IL avg. This will help prevent Ipk(switch) from reaching the guaranteed minimum current limit threshold of 3.3 A. If the design goal is to use a minimum inductance value, let DIL = 2 (IL avg). This will proportionally reduce the converter’s output current capability. Desired peak−to−peak output ripple voltage. For best performance, the ripple voltage should be kept to less than 2% of Vout. Capacitor CO should be a low equivalent series resistance (ESR) electrolytic designed for switching regulator applications. The following converter characteristics must be chosen: |
Similar Part No. - MC34166_05 |
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Similar Description - MC34166_05 |
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