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NCV3063PG Datasheet(PDF) 9 Page - ON Semiconductor |
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NCV3063PG Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 16 page NCP3063, NCP3063B, NCV3063 http://onsemi.com 9 (See Notes 9, 10, 11) Step−Down Step−Up Voltage−Inverting ton toff Vout ) VF Vin * VSWCE * Vout Vout ) VF * Vin Vin * VSWCE |Vout| ) VF Vin * VSWCE ton ton toff f ton toff ) 1 ton toff f ton toff ) 1 ton toff f ton toff ) 1 CT CT + 381.6 @ 10*6 fosc * 343 @ 10*12 IL(avg) Iout Iout ton toff ) 1 Iout ton toff ) 1 Ipk (Switch) IL(avg) ) DIL 2 IL(avg) ) DIL 2 IL(avg) ) DIL 2 RSC 0.20 Ipk (Switch) 0.20 Ipk (Switch) 0.20 Ipk (Switch) L Vin * VSWCE * Vout DIL ton Vin * VSWCE DIL ton Vin * VSWCE DIL ton Vripple(pp) DIL 1 8 f CO 2 ) (ESR)2 [ ton Iout CO ) DIL @ ESR [ ton Iout CO ) DIL @ ESR Vout VTH R2 R1 ) 1 VTH R2 R1 ) 1 VTH R2 R1 ) 1 The Following Converter Characteristics Must Be Chosen: Vin − Nominal operating input voltage. Vout − Desired output voltage. Iout − Desired output current. DIL − Desired peak−to−peak inductor ripple current. For maximum output current 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 current limit threshold set by RSC. If the design goal is to use a minimum inductance value, let DIL = 2(IL(avg)). This will proportionally reduce converter output current capability. f − Maximum output switch frequency. Vripple(pp) − Desired peak−to−peak output ripple voltage. For best performance the ripple voltage should be kept to a low value since it will directly affect line and load regulation. Capacitor CO should be a low equivalent series resistance (ESR) electrolytic designed for switching regulator applications. 9. VSWCE − Darlington Switch Collector to Emitter Voltage Drop, refer to Figures 5, 6, 7 and 8. 10. VF − Output rectifier forward voltage drop. Typical value for 1N5819 Schottky barrier rectifier is 0.4 V. 11. The calculated ton/toff must not exceed the minimum guaranteed oscillator charge to discharge ratio. Figure 13. Design Equations |
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