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MC44603

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
24页 454K
描述
MIXED FREQUENCY MODE GREENLINE PWM CONTROLLER

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中文翻译

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MC44603 数据手册

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Order this document by MC44603/D  
MIXED FREQUENCY MODE  
GREENLINE PWM*  
CONTROLLER:  
Fixed Frequency, Variable Frequency,  
Standby Mode  
The MC44603 is an enhanced high performance controller that is  
specifically designed for off–line and dc–to–dc converter applications. This  
device has the unique ability of automatically changing operating modes if  
the converter output is overloaded, unloaded, or shorted, offering the  
designer additional protection for increased system reliability. The MC44603  
has several distinguishing features when compared to conventional SMPS  
controllers. These features consist of a foldback facility for overload  
protection, a standby mode when the converter output is slightly loaded, a  
demagnetization detection for reduced switching stresses on transistor and  
diodes, and a high current totem pole output ideally suited for driving a power  
MOSFET. It can also be used for driving a bipolar transistor in low power  
converters (< 150 W). It is optimized to operate in discontinuous mode but  
can also operate in continuous mode. Its advanced design allows use in  
current mode or voltage mode control applications.  
VARIABLE FREQUENCY,  
FIXED FREQUENCY,  
STANDBY MODE  
* PWM = Pulse Width Modulation  
16  
1
P SUFFIX  
PLASTIC PACKAGE  
CASE 648  
Current or Voltage Mode Controller  
• Operation up to 250 kHz Output Switching Frequency  
• Inherent Feed Forward Compensation  
• Latching PWM for Cycle–by–Cycle Current Limiting  
• Oscillator with Precise Frequency Control  
16  
1
High Flexibility  
DW SUFFIX  
PLASTIC PACKAGE  
CASE 751G  
• Externally Programmable Reference Current  
• Secondary or Primary Sensing  
• Synchronization Facility  
(SOP–16L)  
• High Current Totem Pole Output  
• Undervoltage Lockout with Hysteresis  
PIN CONNECTIONS  
Safety/Protection Features  
V
1
2
16  
15  
14  
R
R
CC  
ref  
• Overvoltage Protection Against Open Current and Open Voltage Loop  
• Protection Against Short Circuit on Oscillator Pin  
• Fully Programmable Foldback  
Frequency  
V
C
Standby  
Voltage Feedback  
Input  
Output  
Gnd  
3
4
5
• Soft–Start Feature  
13 Error Amp Output  
• Accurate Maximum Duty Cycle Setting  
• Demagnetization (Zero Current Detection) Protection  
• Internally Trimmed Reference  
R
Foldback Input  
12  
Power Standby  
Overvoltage  
Protection (OVP)  
Soft–Start/D  
Voltage Mode  
/
max  
6
7
11  
10  
Current Sense Input  
C
T
GreenLine Controller: Low Power Consumption in Standby Mode  
• Low Startup and Operating Current  
• Fully Programmable Standby Mode  
Demag Detection  
8
9
Sync Input  
(Top View)  
• Controlled Frequency Reduction in Standby Mode  
• Low dV/dT for Low EMI Radiations  
ORDERING INFORMATION  
Operating  
GreenLine is a trademark of Motorola, Inc.  
Temperature Range  
Device  
Package  
Plastic DIP–16  
SOP–16L  
MC44603P  
MC44603DW  
T
= –25° to +85°C  
A
Motorola, Inc. 1999  
Rev 1  
1234567...24

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