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LT1166 PDF预览

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

LT1166 数据手册

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LT1166  
Power Output Stage  
Automatic Bias System  
U
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 IQ  
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.  
U
APPLICATIONS  
Biasing Power MOSFETs  
High Voltage Amplifiers  
Shaker Table Amplifiers  
Audio Power Amplifiers  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATION  
Unity Gain Buffer Amp Driving 1Load  
R1  
15V  
MPS2907  
+
100  
47Ω  
220µF  
R2  
2N2907  
100Ω  
IRF530  
1
I
= 15mA  
TOP  
300pF  
INPUT  
0V  
V
TOP  
5.6k  
8
7
+
SENSE  
1k  
+
I
LIM  
+
R
SENSE  
1µF  
0.33Ω  
4.3k  
3
2
V
OUT  
V
V
V
LT1166  
OUT  
IN  
IN  
R
1Ω  
SENSE  
1µF  
0.33Ω  
1k  
6
5
I
LIM  
OUTPUT  
0V  
SENSE  
V
BOTTOM  
R3  
100Ω  
4
I
= 15mA  
BOTTOM  
IRF9530  
1166 • TA01  
300pF  
–15V  
2N2222  
220µF  
+
R4  
100Ω  
47Ω  
1166 • F01  
MPS2222  
Figure 1. Unity Gain Buffer with Current Limit  
1

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