Electronic Components Datasheet Search |
|
NCP3066MNTXG Datasheet(PDF) 9 Page - ON Semiconductor |
|
NCP3066MNTXG Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 20 page NCP3066, NCV3066 http://onsemi.com 9 APPLICATIONS Figures 15 through 24 show the simplicity and flexibility of the NCP3066. Two main converter topologies are demonstrated with actual test data shown below each of the circuit diagrams. The demo boards have an input for a digital dimming signal. You can provide a PWM signal to change the average output current and reduce the LED brightness. Figure 14 gives the relevant design equations for the key parameters. Additionally, a complete application design aid for the NCP3066 can be found at www.onsemi.com. Parameter Step−Down Step−Up ton toff Vout ) VF Vin * VSWCE * Vout Vout ) VF * Vin Vin * VSWCE ton 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 Ipk (Switch) IL(avg) ) DIL 2 IL(avg) ) DIL 2 RSC 0.20 Ipk (Switch) 0.20 Ipk (Switch) L Vin * VSWCE * Vout DIL ton Vin * VSWCE DIL ton Vripple(pp) DIL 1 8 f CO 2 ) (ESR)2 ton Iout CO ) DIL ESR Iout Vref Rs Vref Rs 9. VSWCE − Darlington Switch Collector to Emitter Voltage Drop, refer to Figures 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 14. 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. |
Similar Part No. - NCP3066MNTXG |
|
Similar Description - NCP3066MNTXG |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |