HT2269 datasheet(8/13 Pages) HOTCHIP

部件名	HT2269

功能描述	Extended Burst Mode Control For Improved Efficiency and Minimum Standby Power Design

PDF	13 Pages

Scroll/Zoom	100%

制造商	HOTCHIP [Hotchip Technology Co.,Ltd]

网页	http://www.hotchip.com.cn/English/Index/index.html

标志

8 / 13 page

HT2269

8/13

Current Mode PWM Controller

www.hotchip.com.cn

Ver1.0

OPERATION DESCRIPTION

Startup Current and Start up Control

Startup current of HT2269 is designed to be very

low so that VDD could be charged up above

UVLO(exit) threshold level and device starts up

quickly. A large value startup resistor can herefore

be used to minimize the power loss yet reliable

startup in application. For a typical AC/DC adaptor

with universal input range design, a 2 MΩ, 1/8 W

startup resistor could be used together with a

VDD capacitor to provide a fast startup and yet

low power dissipation design solution.

Operating Current

The Operating current of HT2269 is low at 2.3mA.

Good efficiency is achieved with B2269C low

operating current together with extended burst

mode control schemes

Frequency shuffling for EMI

improvement

The frequency Shuffling/jittering (switching

frequency modulation) is implemented in HT2269.

The oscillation frequency is modulated with a

internally generated random source so that the

tone energy is evenly spread out. The spread

spectrum minimizes the conduction band EMI and

therefore eases the system design in meeting

stringent EMI requirement.

Burst Mode Operation

At zero load or light load condition, most of the

HT2269 数据表(PDF) 8 Page - Hotchip Technology Co.,Ltd

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