Datasheet > LT1166

LT1166

更新时间： 2024-11-12 22:55:47

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
16页	458K
描述
Power Output Stage Automatic Bias System

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LT1166 数据手册

LT1166

Power Output Stage

Automatic Bias System

FEATURES

DESCRIPTION

The LT^®1166 is a bias generating system for controlling

class AB output current in high powered amplifiers. When

connected with external transistors, the circuit becomes a

unity-gain voltage follower. The LT1166 is ideally suited

for driving power MOSFET devices because it eliminates

all quiescent current adjustments and critical transistor

matching. Multiple outputstages using theLT1166 canbe

paralleled to obtain higher output current.

■

Set Class AB Bias Currents

■

Eliminates Adjustments

■

Eliminates Thermal Runaway of I_Q

■

Corrects for Device Mismatch

■

Simplifies Heat Sinking

■

Programmable Current Limit

■

May Be Paralleled for Higher Current

■

Small SO-8 or PDIP Package

Thermal runaway of the quiescent point is eliminated

because the bias system senses the current in each power

transistor by using a small external sense resistor. A high

speed regulator loop controls the amount of drive applied

to each power device. TheLT1166canbebiasedfromapair

ofresistorsorcurrentsourcesandbecauseitoperatesonthe

drive voltage to the output transistors, it operates on any

supply voltage.

APPLICATIONS

■

Biasing Power MOSFETs

High Voltage Amplifiers

Shaker Table Amplifiers

Audio Power Amplifiers

■

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATION

Unity Gain Buffer Amp Driving 1Ω Load

15V

MPS2907

100Ω

47Ω

220µF

2N2907

100Ω

IRF530

= 15mA

TOP

300pF

INPUT

TOP

5.6k

SENSE

LIM

–

SENSE

1µF

0.33Ω

4.3k

OUT

LT1166

OUT

1Ω

SENSE

1µF

0.33Ω

–

LIM

OUTPUT

–

SENSE

BOTTOM

100Ω

= 15mA

BOTTOM

IRF9530

1166 • TA01

300pF

–15V

2N2222

220µF

100Ω

47Ω

1166 • F01

MPS2222

Figure 1. Unity Gain Buffer with Current Limit

12 3 4 5 6 7...16

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