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UC3842B_11

更新时间： 2024-11-23 12:00:19
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安森美 - ONSEMI 控制器
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22页 411K
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High Performance Current Mode Controllers

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UC3842B_11 数据手册

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UC3842B, UC3843B,  
UC2842B, UC2843B  
High Performance  
Current Mode Controllers  
The UC3842B, UC3843B 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 a trimmed oscillator for precise duty cycle  
control, 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
Also included are protective features consisting of input and  
reference undervoltage lockouts each with hysteresis, cycle−by−cycle  
current limiting, programmable output deadtime, and a latch for single  
pulse metering.  
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 UCX842B has UVLO thresholds of 16 V (on) and 10 V (off),  
ideally suited for off−line converters. The UCX843B is tailored for  
lower voltage applications having UVLO thresholds of 8.5 V (on) and  
7.6 V (off).  
1
SOIC−14  
D SUFFIX  
CASE 751A  
14  
1
SOIC−8  
D1 SUFFIX  
CASE 751  
8
1
Features  
• Trimmed Oscillator for Precise Frequency Control  
• Oscillator Frequency Guaranteed at 250 kHz  
• Current Mode Operation to 500 kHz  
• Automatic Feed Forward Compensation  
• Latching PWM for Cycle−By−Cycle Current Limiting  
• Internally Trimmed Reference with Undervoltage Lockout  
• High Current Totem Pole Output  
PIN CONNECTIONS  
1
2
3
4
8
7
6
5
Compensation  
Voltage Feedback  
Current Sense  
V
V
ref  
CC  
Output  
GND  
R /C  
T
T
(Top View)  
Compensation  
1
2
3
4
5
6
7
14  
13  
12  
11  
10  
9
V
ref  
• Undervoltage Lockout with Hysteresis  
• Low Startup and Operating Current  
NC  
Voltage Feedback  
NC  
NC  
V
V
CC  
• This is a Pb−Free and Halide−Free Device  
C
V
CC  
7(12)  
Current Sense  
NC  
Output  
V
V
GND  
CC  
ref  
5.0V  
Reference  
Undervoltage  
Lockout  
8
R /C  
T
Power Ground  
T
8(14)  
R
R
(Top View)  
V
ref  
V
C
Undervoltage  
Lockout  
7(11)  
ORDERING INFORMATION  
R /C  
T
Output  
T
Oscillator  
See detailed ordering and shipping information in the package  
dimensions section on page 17 of this data sheet.  
6(10)  
4(7)  
Latching  
PWM  
Power  
Ground  
5(8)  
Voltage  
Feedback  
Input  
2(3)  
Output  
Compensation  
+
-
DEVICE MARKING INFORMATION  
See general marking information in the device marking  
section on page 19 of this data sheet.  
Error  
Amplifier  
Current  
Sense  
Input  
3(5)  
1(1)  
GND 5(9)  
Pin numbers in parenthesis are for the D suffix SOIC−14 package.  
Figure 1. Simplified Block Diagram  
© Semiconductor Components Industries, LLC, 2011  
1
Publication Order Number:  
July, 2011 − Rev. 15  
UC3842B/D  
1234567...22

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