Datasheet > UCC3880-6

UCC3880-6

更新时间： 2022-11-30 12:58:58

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	340K
描述
Pentium Pro Controller

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数据手册

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UCC3880-6 数据手册

UCC2880-4/-5/-6

UCC3880-4/-5/-6

PRELIMINARY

Pentium® Pro Controller

FEATURES

DESCRIPTION

•

Combined DAC/Voltage

The UCC3880-4/-5/-6 combines high precision reference and voltage monitor-

ing circuitry with average current mode PWM controller circuitry to power Intel

Pentium Pro and other high-end microprocessors with a minimum of external

components. The UCC3880-x converts 5VDC to an adjustable output, ranging

from 2.0VDC to 3.5VDC in 100mV steps with 1% DC system accuracy.

Monitor and PWM Functions

•

4-Bit Digital-to-Analog

Converter (DAC)

•

1.0% DAC/Reference

The chip includes a precision 5V reference which is capable of sourcing cur-

rent to an external load. The output voltage of the DAC is derived from this

reference, and is programmed directly by Intel’s VID pins (Table 1).

Low Offset X20 Current Sense

Amplifier

The accuracy of the DAC/reference combination is 1.0%. The overvoltage and

undervoltage comparators monitor the system output voltage and indicate

when it rises above or falls below its programmed value by more than 7.5%. A

second overvoltage protection comparator pulls the current amplifier output

voltage low to force zero duty cycle when the system output voltage exceeds

its designed value by more than 15%. This comparator also terminates the cy-

cle. Undervoltage lockout circuitry assures the correct logic states at the out-

puts during powerup and powerdown. Grounding the ENABLE pin forces the

GATE output low.

•

100kHz, 200kHz, 400kHz

Oscillator Frequency Options

•

Foldback Current Limiting

Overvoltage and Undervoltage

Fault Windows

•

Undervoltage Lockout

2Ω Totem Pole Output

Chip Disable Function

(continued)

BLOCK DIAGRAM

UDG-96106-1

10/96

12 3 4 5 6 7 8

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