UC1886D

更新时间： 2024-11-14 13:15:07

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
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UC1886D 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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