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UC3844B_12

更新时间： 2024-11-23 12:16:55
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安森美 - ONSEMI 控制器
页数 文件大小 规格书
19页 387K
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High Performance Current Mode Controllers

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UC3844B_12 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
ref  
V
CC  
• Latching PWM for Cycle−By−Cycle Current Limiting  
• Internally Trimmed Reference with Undervoltage Lockout  
• High Current Totem Pole Output  
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
CC  
7(12)  
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, 2012  
1
Publication Order Number:  
December, 2012 − Rev. 11  
UC3844B/D  
1234567...19

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