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UC3845DR2

更新时间： 2024-01-18 11:50:31
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
16页 617K
描述
High Performance Current Mode Controllers

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UC3845DR2 技术参数

是否Rohs认证： 符合生命周期：Obsolete
零件包装代码：SOIC包装说明：SOP, SOP14,.25
针数：14Reach Compliance Code：unknown
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.72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：8.2 V
标称输入电压：15 VJESD-30 代码：R-PDSO-G14
JESD-609代码：e3长度：8.65 mm
湿度敏感等级：1功能数量：1
端子数量：14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：SOP14,.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：500 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

UC3845DR2 数据手册

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UC3844, UC3845, UC2844,  
UC2845  
High Performance  
Current Mode Controllers  
The UC3844, UC3845 series are high performance fixed frequency  
current mode controllers. They are specifically designed for Off−Line  
and DC−to−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 dead  
times to be programmed for 50% to 70%.  
http://onsemi.com  
PDIP−8  
N SUFFIX  
CASE 626  
8
1
SOIC−14  
D SUFFIX  
CASE 751A  
14  
1
These devices are available in an 8−pin dual−in−line 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−8  
D1 SUFFIX  
CASE 751A  
8
1
The UCX844 has UVLO thresholds of 16 V (on) and 10 V (off),  
ideally suited for off−line converters. The UCX845 is tailored for  
lower voltage applications having UVLO thresholds of 8.5 V (on) and  
7.6 V (off).  
PIN CONNECTIONS  
Compensation  
1
2
8
7
V
ref  
Voltage Feedback  
V
CC  
Features  
3
4
6
5
Current Sense  
R /C  
Output  
GND  
• Current Mode Operation to 500 kHz Output Switching Frequency  
• Output Deadtime Adjustable from 50% to 70%  
• Automatic Feed Forward Compensation  
T
T
(Top View)  
• Latching PWM for Cycle−By−Cycle Current Limiting  
• Internally Trimmed Reference with Undervoltage Lockout  
• High Current Totem Pole Output  
• Input Undervoltage Lockout with Hysteresis  
• Low Startup and Operating Current  
• Direct Interface with ON Semiconductor SENSEFETt Products  
• Pb−Free Packages are Available  
1
14  
13  
Compensation  
NC  
V
ref  
2
NC  
V
3
4
12  
11  
Voltage Feedback  
NC  
CC  
V
C
5
6
10  
9
Current Sense  
NC  
Output  
V
CC  
7(12)  
GND  
R /C  
T
7
8
Power Ground  
T
V
ref  
8(14)  
V
CC  
Undervoltage  
Lockout  
5.0V  
Reference  
(Top View)  
R
R
V
ref  
V
C
Undervoltage  
Lockout  
7(11)  
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
dimensions section on page 14 of this data sheet.  
R C  
T
Output  
6(10)  
T
Flip  
Flop  
&
Oscillator  
4(7)  
Voltage  
Feedback  
PWR GND  
5(8)  
Latching  
PWM  
+
−
DEVICE MARKING INFORMATION  
See general marking information in the device marking  
section on page page 14 of this data sheet.  
2(3)  
Current  
Sense  
3(5)  
Error  
Amplifier  
1(1)  
Output  
Comp.  
GND 5(9)  
Pin numbers in parenthesis are for the D suffix SOIC−14 package.  
Figure 1. Simplified Block Diagram  
© Semiconductor Components Industries, LLC, 2006  
1
Publication Order Number:  
July, 2006 − Rev. 7  
UC3844/D  
1234567...16

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