Datasheet > UC3856QP

UC3856QP

更新时间： 2024-11-01 23:38:59

品牌	Logo	应用领域
其他 - ETC		开关控制器
页数	文件大小	规格书
9页	418K
描述
Current-Mode SMPS Controller

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中文翻译

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数据手册

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UC3856QP 数据手册

UC1856

UC2856

UC3856

Improved Current Mode PWM Controller

FEATURES

DESCRIPTION

•

Pin-for-Pin Compatible With the UC3846

The UC3856 is a high performance version of the popular UC3846

series of current mode controllers, and is intended for both design

upgrades and new applications where speed and accuracy are impor-

tant. All input to output delays have been minimized, and the current

sense output is slew rate limited to reduce noise sensitivity. Fast 1.5A

peak output stages have been added to allow rapid switching of

power FETs.

•

65ns Typical Delay From Shutdown to

Outputs, and 50ns Typical Delay From

Sync to Outputs

•

Improved Current Sense Amplifier With

Reduced Noise Sensitivity

Differential Current Sense with 3V

Common Mode Range

A low impedance TTL compatible sync output has been implemented

with a tri-state function when used as a sync input.

Trimmed Oscillator Discharge Current

for Accurate Deadband Control

Internal chip grounding has been improved to minimize internal

“noise” caused when driving large capacitive loads. This, in conjunc-

tion with the improved differential current sense amplifier results in

enhanced noise immunity.

•

Accurate 1V Shutdown Threshold

High Current Dual Totem Pole Outputs

(1.5A peak)

Other features include a trimmed oscillator current (8%) for accurate

frequency and dead time control; a 1V, 5% shutdown threshold; and

4kV minimum ESD protection on all pins.

•

TTL Compatible Oscillator SYNC Pin

Thresholds

4kV ESD Protection

BLOCK DIAGRAM

UDG-96176

9/96

12 3 4 5 6 7...9

中文翻译

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