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UC2844BDR2

更新时间： 2024-11-22 21:53:59
品牌 Logo 应用领域
安森美 - ONSEMI 开关光电二极管控制器
页数 文件大小 规格书
20页 320K
描述
HIGH PERFORMANCE CURRENT MODE CONTROLLERS

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UC2844BDR2 数据手册

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UC3844B, UC3845B,  
UC2844B, UC2845B  
High Performance  
Current Mode Controllers  
The UC3844B, UC3845B series are high performance fixed  
frequency current mode controllers. They are specifically designed for  
Off−Line and dc−dc converter applications offering the designer a  
cost−effective solution with minimal external components. These  
integrated circuits feature an oscillator, a temperature compensated  
reference, high gain error amplifier, current sensing comparator, and a  
high current totem pole output ideally suited for driving a power  
MOSFET.  
http://onsemi.com  
PDIP−8  
N SUFFIX  
CASE 626  
8
1
Also included are protective features consisting 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%.  
SOIC−8  
D1 SUFFIX  
CASE 751  
8
1
These devices are available in an 8−pin dual−in−line and surface  
mount (SOIC−8) plastic package as well as the 14−pin plastic surface  
mount (SOIC−14). The SOIC−14 package has separate power and  
ground pins for the totem pole output stage.  
The UCX844B has UVLO thresholds of 16 V (on) and 10 V (off),  
ideally suited for off−line converters. The UCX845B is tailored for  
lower voltage applications having UVLO thresholds of 8.5 V (on) and  
7.6 V (off).  
SOIC−14  
D SUFFIX  
CASE 751A  
14  
1
PIN CONNECTIONS  
Features  
1
2
3
4
8
7
6
5
Compensation  
Voltage Feedback  
Current Sense  
V
V
ref  
CC  
• Pb−Free Packages are Available  
Output  
• Trimmed Oscillator for Precise Frequency Control  
• Oscillator Frequency Guaranteed at 250 kHz  
• 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  
• Internally Trimmed Reference with Undervoltage Lockout  
• High Current Totem Pole Output  
R /C  
T
GN  
D
T
(Top View)  
Compensation  
1
2
3
4
5
6
7
14  
13  
12  
11  
10  
9
V
ref  
NC  
Voltage Feedback  
NC  
NC  
V
V
CC  
C
Current Sense  
NC  
Output  
GND  
8
R /C  
T
Power Ground  
T
• Undervoltage Lockout with Hysteresis  
• Low Startup and Operating Current  
(Top View)  
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
dimensions section on page 2 of this data sheet.  
DEVICE MARKING INFORMATION  
See general marking information in the device marking  
section on page 16 of this data sheet.  
Semiconductor Components Industries, LLC, 2004  
1
Publication Order Number:  
September, 2004 − Rev. 3  
UC3844B/D  
1234567...20

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UC2844BDR2 替代型号

型号 品牌 替代类型 描述 数据表
UC2844BDR2G ONSEMI

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