UC3886

更新时间： 2024-11-24 22:39:59

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
8页	293K
描述
Average Current Mode PWM Controller IC

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UC3886 数据手册

UC1886

UC2886

UC3886

Average Current Mode PWM Controller IC

FEATURES

DESCRIPTION

• 10.3V - 20V Operating Range

The UC3886 family of PWM controller ICs is designed for DC-to-DC con-

verters with average current mode control. It is designed for use in con-

junction with the UC3910 4-bit DAC and Voltage Monitor. The UC3886

drives an external N-channel MOSFET and can be used to power the In-

tel Pentium® Pro and other high-end microprocessors.

• Low Offset Voltage Amplifier

• High Bandwidth Current and Voltage

Amplifiers

The UC3886 in conjunction with the UC3910 converts 5VDC to an adjust-

able output ranging from 2.0V to 3.5V in 100mV steps with 35mV DC sys-

tem accuracy.

• Low Offset Current Sense Amplifier

• Undervoltage Lockout

• Trimmed 5 Volt Reference

The oscillator is programmed by the user’s selection of an external resis-

tor and capacitor, and is designed for 300kHz typical operation.

• Externally Programmable Oscillator

Charge Current

The voltage and current amplifiers have 3.5MHz gain-bandwidth product

to satisfy high performance system requirements.

• 1.5A Peak Totem Pole Output

The internal current sense amplifier permits the use of a low value current

sense resistor, minimizing power loss. It has inputs and outputs accessi-

ble to allow user-selection of gain-setting resistors, and is internally com-

pensated for a gain of 5 and above. The command voltage input is

buffered and provided for use as the reference for the current sense am-

plifier.

• Available in 16-pin DIL or SOIC

Packages

The output of the voltage amplifier (input to the current amplifier) is

clamped to 1 volt above the command voltage to serve as a current limit.

The gate output can be disabled by bringing the CAO/ENBL pin to below

0.8 volts.

BLOCK DIAGRAM

UDG-95098-2

6/98

12 3 4 5 6 7 8

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与UC3886相关器件

型号	品牌	获取价格	描述	数据表
UC3886D	TI	获取价格	Average Current Mode PWM Controller IC
UC3886DG4	TI	获取价格	Average Current Mode PWM Controller IC
UC3886DTR	TI	获取价格	Average Current Mode PWM Controller IC 16-SOIC 0 to 70
UC3886DTRG4	TI	获取价格	1.5A SWITCHING CONTROLLER, 110kHz SWITCHING FREQ-MAX, PDSO16, SOIC-16
UC3886J	TI	获取价格	1.5A SWITCHING CONTROLLER, 300kHz SWITCHING FREQ-MAX, CDIP16
UC3886N	TI	获取价格	Average Current Mode PWM Controller IC
UC3886NG4	TI	获取价格	Average Current Mode PWM Controller IC
UC388DW	TI	获取价格	UC388DW
UC388DWTR	TI	获取价格	UC388DWTR
UC388J	TI	获取价格	UC388J