UC2849

更新时间： 2024-11-16 08:26:23

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
11页	544K
描述
Secondary Side Average Current Mode Controller

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UC2849 数据手册

UC1849

UC2849

UC3849

Secondary Side Average Current Mode Controller

FEATURES

DESCRIPTION

The UC1849 family of average current mode controllers accurately accom-

plishes secondary side average current mode control. The secondary side

output voltage is regulated by sensing the output voltage and differentially

sensing the AC switching current. The sensed output voltage drives a volt-

age error amplifier.The AC switching current, monitored by a current sense

resistor, drives a high bandwidth, low offset current sense amplifier. The

outputs of the voltage error amplifier and current sense amplifier differential-

ly drive a high bandwidth, integrating current error amplifier. The sawtooth

waveform at the current error amplifier output is the amplified and inverted

inductor current sensed through the resistor. This inductor current down-

slope compared to the PWM ramp achieves slope compensation, which

gives an accurate and inherent fast transient response to changes in load.

•

Practical Secondary Side Control

of Isolated Power Supplies

•

1MHz Operation

Differential AC Switching Current

Sensing

•

Accurate Programmable

Maximum Duty Cycle

Multiple Chips Can be

Synchronized to Fastest

Oscillator

•

Wide Gain Bandwidth Product

(70MHz, Acl>10) Current Error

and Current Sense Amplifiers

The UC1849 features load share, oscillator synchronization, undervoltage

lockout, and programmable output control. Multiple chip operation can be

achieved by connecting up to ten UC1849 chips in parallel.The SHARE bus

and CLKSYN bus provide load sharing and synchronization to the fastest

oscillator respectively. The UC1849 is an ideal controller to achieve high

power, secondary side average current mode control.

Up to Ten Devices Can Easily

Share a Common Load

BLOCK DIAGRAM

Pin numbers refer to 24-pin packages.

UDG-94110

7/95

12 3 4 5 6 7...11

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