Electronic Components Datasheet Search |
|
MURS160T3 Datasheet(PDF) 1 Page - ON Semiconductor |
|
MURS160T3 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 10 page © Semiconductor Components Industries, LLC, 2003 June, 2003 - Rev. 1 1 Publication Order Number: AND8098/D AND8098/D Low−Cost 100 mA High−Voltage Buck and Buck−Boost Using NCP1052 Prepared by: Kahou Wong ON Semiconductor INTRODUCTION This application note presents low-cost high-voltage 100 mA non-isolated power supply using NCP1052 by buck and buck-boost topology. The NCP1052 is one of the latest low-cost switching controllers with integrated 700 V/ 300 mA power switch from ON Semiconductor. It is primarily designed for isolated 10 W-range flyback converter. If isolation is not needed, the IC can also be used as stepping-down buck and buck-boost converter for further cost saving by removing optocoupler and replacing the transformer by an inductor. The output current capability is 100 mA. The possible operating range is from input range between 20 Vdc and 700 Vdc to output range of 5.0 V or above with 100 mA. Typical efficiency around 65% is obtained in the 12 V buck demo board. Advantages of the proposed circuits include: • Comparing to flyback, buck and buck-boost eliminates optocoupler and replaces transformer by an inductor for cost saving. • Buck and buck-boost offers smaller voltage stress in switches comparing to flyback. It minimizes the switching loss and increases efficiency. • NCP105x can power up itself from the high input voltage with wide range between 20 Vdc and 700 Vdc. It needs no extra supply circuit. • NCP105x operates at 44, 100, or 136 kHz and accommodates low-cost components such as aluminum electrolytic capacitors and powered-iron core magnetic. • NCP105x offers frequency jittering for reduced electromagnetic inference (EMI). • NCP105x offers thermal and short circuit fault protection. • Simple design as no control-loop compensation is concerned. The proposed buck and buck-boost converters are very similar to each other. Their major difference is that buck provides a positive output voltage but buck-boost provides a negative output voltage referring to the input ground. PRINCIPLE OF OPERATION Figure 1 shows the proposed buck and buck-boost converters. The rectifier circuit, which consists of capacitor C3 and diode D3, is in the front end for AC or DC input voltage. Then, the NCP1052 is self-powered up from the rectified input voltage directly with a VCC capacitor C2. When the switch inside the IC is opened, there is a voltage across Drain (D) and Source (S) pins of the IC. If this voltage is greater than 20 V, an internal current source Istart = 6.3 mA (typ.) inside the IC charges up C2 and a voltage in C2 is built up for the operation of the IC. Comparing to the switching frequency, the VCC voltage level is in a lower-frequency 7.5-8.5 V hysteresis loop. This VCC hysteresis loop is for frequency jittering features to minimize EMI and short-circuit fault timing function. Input Output D3 C3 D L C1 C Z1 C2 VCC FB DS D2 Z2 D1 R 1 (a) Buck Input Output D3 C3 D L C1 C Z1 C2 VCC FB DS D2 Z2 D1 R1 (b) Buck-boost Figure 1. Proposed Circuit Using NCP1052 In Figure 2a it is noted that in the buck topology the input voltage powers up the IC through the path across the inductor L and capacitor C. This charging path passes APPLICATION NOTE http://onsemi.com |
Similar Part No. - MURS160T3 |
|
Similar Description - MURS160T3 |
|
|
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 |