Datasheet > UP2B-681

UP2B-681

更新时间： 2024-11-29 21:55:07

品牌	Logo	应用领域
安森美 - ONSEMI		/
页数	文件大小	规格书
10页	97K
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Low-Cost 100 mA High-Voltage Buck and Buck-Boost Using NCP1052

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UP2B-681 数据手册

AND8098/D

Low−Cost 100 mA

High−Voltage Buck and

Buck−Boost Using NCP1052

Prepared by: Kahou Wong

ON Semiconductor

http://onsemi.com

APPLICATION NOTE

INTRODUCTION

PRINCIPLE OF OPERATION

This application note presents low-cost high-voltage

Figure 1 shows the proposed buck and buck-boost

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.

converters. The rectifier circuit, which consists of capacitor

C and diode D , 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 V capacitor C .

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 I

= 6.3 mA

start

(typ.) inside the IC charges up C and a voltage in C is built

up for the operation of the IC. Comparing to the switching

frequency, the V voltage level is in a lower-frequency

7.5-8.5 V hysteresis loop. This V hysteresis loop is for

frequency jittering features to minimize EMI and

short-circuit fault timing function.

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.

Input

Output

• 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.

(a) Buck

• 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.

Input

Output

(b) Buck-boost

• Simple design as no control-loop compensation is

concerned.

Figure 1. Proposed Circuit Using NCP1052

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.

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

Semiconductor Components Industries, LLC, 2003

Publication Order Number:

June, 2003 - Rev. 1

AND8098/D

12 3 4 5 6 7...10

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