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NCV3064DR2G Datasheet(PDF) 9 Page - ON Semiconductor |
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NCV3064DR2G Datasheet(HTML) 9 Page - ON Semiconductor |
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9 / 20 page  NCP3064, NCP3064B, NCV3064 http://onsemi.com 9 APPLICATIONS Figures 16, 20 and 24 show the simplicity and flexibility of the NCP3064. Two main converter topologies are demonstrated with actual test data shown below the circuit diagrams. Figure 15 gives the relevant design equations for the key parameters. Additionally, a complete application design aid for the NCP3064 can be found at www.onsemi.com. It is possible to create applications with external transistors. This solution helps to increase output current and helps with efficiency, still keeping the cost of materials low. Another advantage of using the external transistor is higher operating frequency, which can go up to 250 kHz. Smaller size of the output components such as inductor and capacitor can be used then. (See Notes 8, 9, 10) 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 8. VSWCE − Darlington Switch Collector to Emitter Voltage Drop, refer to Figures 7, 5, 8 and 9. 9. VF − Output rectifier forward voltage drop. Typical value for 1N5819 Schottky barrier rectifier is 0.4 V. 10.The calculated ton/toff must not exceed the minimum guaranteed oscillator charge to discharge ratio. Figure 15. Design Equations 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. |
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