Electronic Components Datasheet Search |
|
MA78S40PC Datasheet(PDF) 6 Page - ON Semiconductor |
|
MA78S40PC Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 8 page µA78S40 6 MOTOROLA ANALOG IC DEVICE DATA CT Ipk Oscilator – + Comp. – + Op Amp 1.25V Reference S R Q 170 1 2 3 4 5 6 7 8 9 10 11 1213 141516 D1 R1 1.5k 1N5822 + 100 CT Vin 15V 1800 pF RSC 0.30 50 µHL 100 Vout –15V/500mA 100 + CO R2 18k VCC 270 D45H8 Figure 7. Inverting Converter Design Formula Table fmin Vin(min) Vsat Calculation Step–Down Step–Up Inverting ton toff Vout + VF Vout – VF Vin(min) Vout + VF Vin(min) – Vsat – Vout Vin(min) – Vsat (ton + toff) max fmin I fmin I I CT 4 x 10 5 ton 4 x 10 5 ton 4 x 10 5 ton Ipk(switch) 2 Iout(max) ton – toff toff ton + toff toff 2 Iout(max) 2 Iout(max) RSC 0.33 0.33 0.33 Ipk(switch) Ipk(switch) Ipk(switch) L(min) Vin(min) – Vsat – Vout Vin(min) – Vsat Vin(min) – Vsat ton(max) ton(max) ton(max) Ipk(switch) Ipk(switch) Ipk(switch) CO Ipk(switch) (ton + toff)Iout ton Iout ton 8 Vripple(pp) Vripple Vripple Vsat = Saturation voltage of the output switch. VF = Forward voltage drop of the ringback rectifier. ≈≈ The following power supply characteristics must be chosen: – Nominal input voltage. If this voltage is not constant, then use Vin(max) for step–down and Vin(min) for step–up and inverting convertor. – Desired output voltage: Vout = 1.25 – Desired output current. – Minimum desired output switching frequency at the selected values for Vin and IO. – Desired peak–to–peak output ripple voltage. In practice, the calculated value will need to be increased due to the capacitor’s equivalent series – resistance and board layout. The ripple voltage should be kept to a low value since it will directly effect the line and load regulation. See Application Note AN920 for further information for step–down and step–up: for inverting. 1 ) R2 R1 Vout + 1.25 R2 R1 Vin Vout Iout fmin Vripple(pp) |
Similar Part No. - MA78S40PC |
|
Similar Description - MA78S40PC |
|
|
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 |