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MC44602

更新时间： 2024-11-14 22:39:59
品牌 Logo 应用领域
安森美 - ONSEMI 控制器
页数 文件大小 规格书
18页 336K
描述
HIGH PERFORMANCE CURRENT MODE CONTROLLER

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MC44602 数据手册

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Order this document by MC44602/D  
The MC44602 is an enhanced high performance fixed frequency current  
mode controller that is specifically designed for off–line and high voltage  
dc–to–dc converter applications. This device has the unique ability of  
changing operating modes if the converter output is overloaded or shorted,  
offering the designer additional protection for increased system reliability.  
The MC44602 has several distinguishing features when compared to  
conventional current mode controllers. These features consist of a foldback  
amplifier for overload detection, valid load and demag comparators with a  
fault latch for short circuit detection, thermal shutdown, and separate high  
current source and sink outputs that are ideally suited for driving a high  
voltage bipolar power transistor, such as the MJE18002, MJE18004, or  
MJE18006.  
HIGH PERFORMANCE  
CURRENT MODE  
CONTROLLER  
SEMICONDUCTOR  
TECHNICAL DATA  
Standard features include an oscillator with a sync input, a temperature  
compensated reference, high gain error amplifier, and a current sensing  
comparator. Protective features consist of input and reference undervoltage  
lockouts each with hysteresis, cycle–by–cycle current limiting, a latch for  
single pulse metering, and a flip–flop which blanks the output off every other  
oscillator cycle, allowing output deadtimes to be programmed from 50% to  
70%. This device is manufactured in a 16 pin dual–in–line heat tab package  
for improved thermal conduction.  
16  
1
P2 SUFFIX  
PLASTIC PACKAGE  
CASE 648C  
• Separate High Current Source and Sink Outputs Ideally Suited for  
Driving Bipolar Power Transistors: 1.0 A Source, 1.5 A Sink  
DIP (12 + 2 + 2)  
• Unique Overload and Short Circuit Protection  
• Thermal Protection  
• Oscillator with Sync Input  
• Current Mode Operation to 500 kHz Output Switching Frequency  
• Output Deadtime Adjustable from 50% to 70%  
• Automatic Feed Forward Compensation  
• Latching PWM for Cycle–By–Cycle Current Limiting  
• Input and Reference Undervoltage Lockouts with Hysteresis  
• Low Startup and Operating Current  
PIN CONNECTIONS  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
Compensation  
Load Detect Input  
V
ref  
V
CC  
C
Voltage Feedback Input  
V
Simplified Block Diagram  
Sink Gnd  
Sink Gnd  
V
CC  
5.0V  
Reference  
Undervoltage  
Lockout  
V
V
CC  
ref  
Current Sense Input  
Sync Input  
Source Output  
Sink Output  
Gnd  
15  
16  
V
ref  
Undervoltage  
Lockout  
R
/C  
T
Short Circuit  
Detection  
T
Load Detect Input  
Sync Input  
2
7
(Top View)  
V
C
14  
Oscillator  
R
/C  
T
T
Flip Flop  
and  
Latching  
PWM  
8
1
Source Output  
Sink Output  
11  
10  
Thermal  
Compensation  
Error  
Amplifier  
Sink Ground  
4, 5, 12, 13  
ORDERING INFORMATION  
Operating  
Voltage Feedback–Input  
Foldback  
Amplifier  
3
Current Sense Input  
6
Temperature Range  
Device  
Package  
MC44602  
T
A
= –25 to 85°C  
DIP (12 + 2 + 2)  
Gnd  
9
Motorola, Inc. 1996  
Rev 0  
1234567...18

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