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MC44603A

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 409K
描述
MIXED FREQUENCY MODE GREENLINE PWM CONTROLLER

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MC44603A 数据手册

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Order this document by MC44603A/D  
MIXED FREQUENCY MODE  
GREENLINE PWM*  
CONTROLLER:  
Fixed Frequency, Variable Frequency,  
Standby Mode  
VARIABLE FREQUENCY,  
FIXED FREQUENCY,  
STANDBY MODE  
The MC44603A 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  
MC44603A 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.  
* 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  
High Flexibility  
16  
1
DW SUFFIX  
PLASTIC PACKAGE  
CASE 751G  
• Externally Programmable Reference Current  
• Secondary or Primary Sensing  
(SOP–16L)  
• Synchronization Facility  
• High Current Totem Pole Output  
• Undervoltage Lockout with Hysteresis  
Safety/Protection Features  
PIN CONNECTIONS  
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
13 Error Amp Output  
• Soft–Start Feature  
R
Foldback Input  
12  
Power Standby  
• Accurate Maximum Duty Cycle Setting  
• Demagnetization (Zero Current Detection) Protection  
• Internally Trimmed Reference  
Overvoltage  
Protection (OVP)  
Soft–Start/D  
Voltage Mode  
/
max  
6
7
11  
10  
Current Sense Input  
C
T
• Enhanced Output Drive  
Demag Detection  
8
9
Sync Input  
GreenLine Controller: Low Power Consumption in Standby Mode  
• Low Startup and Operating Current  
• Fully Programmable Standby Mode  
• Controlled Frequency Reduction in Standby Mode  
• Low dV/dT for Low EMI Radiations  
(Top View)  
ORDERING INFORMATION  
Operating  
Temperature Range  
Device  
Package  
Plastic DIP–16  
SOP–16L  
GreenLine is a trademark of Motorola, Inc.  
MC44603AP  
MC44603ADW  
T
A
= –25° to +85°C  
Motorola, Inc. 1999  
Rev 1  
1234567...24

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