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UC3845BD1G PDF预览

UC3845BD1G

更新时间： 2024-11-23 12:47:15
品牌 Logo 应用领域
安森美 - ONSEMI 控制器
页数 文件大小 规格书
19页 399K
描述
High Performance Current Mode Controllers

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中文翻译

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UC3845BD1G 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Active零件包装代码：SOIC
包装说明：SOP, SOP8,.25针数：8
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01Factory Lead Time：1 week
风险等级：0.44模拟集成电路 - 其他类型：SWITCHING CONTROLLER
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：25 V最小输入电压：12 V
标称输入电压：15 VJESD-30 代码：R-PDSO-G8
JESD-609代码：e3长度：4.9 mm
湿度敏感等级：1功能数量：1
端子数量：8最高工作温度：70 °C
最低工作温度：最大输出电流：1 A
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装等效代码：SOP8,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE峰值回流温度（摄氏度）：260
认证状态：Not Qualified座面最大高度：1.75 mm
子类别：Switching Regulator or Controllers表面贴装：YES
切换器配置：SINGLE最大切换频率：275 kHz
技术：BIPOLAR温度等级：COMMERCIAL
端子面层：Tin (Sn)端子形式：GULL WING
端子节距：1.27 mm端子位置：DUAL
处于峰值回流温度下的最长时间：40宽度：3.9 mm
Base Number Matches：1

UC3845BD1G 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.  
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%.  
http://onsemi.com  
PDIP−8  
N SUFFIX  
CASE 626  
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.  
SOIC−14  
D SUFFIX  
CASE 751A  
14  
1
The UCX844B has UVLO thresholds of 16V (on) and 10V (off), ideally  
suited for off−line converters. The UCX845B is tailored for lower voltage  
applications having UVLO thresholds of 8.5V (on) and 7.6V (off).  
Features  
SOIC−8  
D1 SUFFIX  
CASE 751  
8
1
• 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  
PIN CONNECTIONS  
1
2
3
4
8
7
6
5
Compensation  
Voltage Feedback  
Current Sense  
V
V
ref  
• Latching PWM for Cycle−By−Cycle Current Limiting  
• Internally Trimmed Reference with Undervoltage Lockout  
• High Current Totem Pole Output  
CC  
Output  
R /C  
T
GN  
D
T
(Top View)  
• Undervoltage Lockout with Hysteresis  
• Low Startup and Operating Current  
Compensation  
1
2
3
4
5
6
7
14  
13  
12  
11  
10  
9
V
ref  
• These Devices are Pb−Free and are RoHS Compliant  
NC  
Voltage Feedback  
NC  
NC  
• NCV Prefix for Automotive and Other Applications Requiring  
Unique Site and Control Change Requirements; AEC−Q100  
Qualified and PPAP Capable  
V
V
CC  
C
Current Sense  
NC  
Output  
V
7(12)  
CC  
GND  
8
R /C  
T
Power Ground  
T
V
CC  
V
ref  
5.0V  
Reference  
(Top View)  
Undervoltage  
Lockout  
8(14)  
R
R
V
ref  
V
C
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
dimensions section on page 15 of this data sheet.  
Undervoltage  
Lockout  
7(11)  
Output  
R /C  
T
T
Oscillator  
6(10)  
Power  
Ground  
4(7)  
Latching  
PWM  
DEVICE MARKING INFORMATION  
See general marking information in the device marking  
section on page 16 of this data sheet.  
Voltage  
Feedback  
Input  
5(8)  
2(3)  
1(1)  
Error  
Amplifier  
Current  
Sense Input  
Output/  
Compensation  
3(5)  
GND  
5(9)  
Pin numbers in parenthesis are for the D suffix SOIC-14 package.  
Figure 1. Simplified Block Diagram  
© Semiconductor Components Industries, LLC, 2013  
1
Publication Order Number:  
August, 2013 − Rev. 11  
UC3844B/D  
1234567...19

中文翻译

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UC3845BD1G 替代型号

型号 品牌 替代类型 描述 数据表
UC3844BNG ONSEMI

完全替代

 HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3845BD1R2G ONSEMI

完全替代

 HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC2844BD1R2G ONSEMI

完全替代

 HIGH PERFORMANCE CURRENT MODE CONTROLLERS

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