Datasheet > 8565L-S08-R

8565L-S08-R

更新时间： 2022-03-30 06:49:26

品牌	Logo	应用领域
友顺 - UTC		功率因数校正
页数	文件大小	规格书
13页	368K
描述
HIGH PERFORMANCE POWER FACTOR CORRECTION

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8565L-S08-R 数据手册

8565

Preliminary

LINEAR INTEGRATED CIRCUIT

FUNCTIONAL DESCRIPTION(Cont.)

3. Start-up (Soft-Start)

The operation of OTA1 during startup is shown in Fig. 4 and 5.

V_SENSE

R3+R4

)

×V_OUT

(

Soft Start

_OUT<80% rated

Normal Operation

V_OUT>80% rated

4.0V

Soft Start

10.8μA during

Soft Start

OTA1

V_COMP

Open-Loop

Protect

av(I_IN)

0.8V

(OLP)

UTC 8565

Fig. 4 Soft Start Circuit

Fig. 5 Soft Start With Controlled Current

It sources a constant 10.8µA into the compensation network at pin 2 (V_COMP). The voltage at this pin rises

linearly and so does the amplitude of the input current. As soon as the output voltage V_OUTreaches 80% of its rated

level, the startup procedure is finished and the normal voltage control takes over. In normal operation, the IC

operates with a higher maximum current at OTA1 and therefore with a higher voltage loop gain in order to improve

the dynamic behavior of the device.

The advantage of this technique is a soft-start function with lower stress for the boost diode but without the risk of

audible noise.

4. System Protection

The IC is equipped with various protection features to ensure the PFC system in safe operating range. Depending

on the input line voltage (V_IN) and output bus voltage (V_OUT), When these protections are active the conditions are

shown in Fig. 6 and 7.

The following sections describe the functionality of these protection features.

UNISONIC TECHNOLOGIES CO., LTD

7 of 13

QW-R114-004.b

www.unisonic.com.tw

1...4 5 678 9 10...13

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