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UC3842B_07

更新时间： 2024-11-23 04:48:15
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安森美 - ONSEMI 控制器
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High Performance Current Mode Controllers

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UC3842B_07 数据手册

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UC3842B, UC3843B,  
UC2842B, UC2843B,  
NCV3843BV  
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
1
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.  
SOIC−14  
D SUFFIX  
CASE 751A  
14  
1
SOIC−8  
D1 SUFFIX  
8
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).  
CASE 751  
1
PIN CONNECTIONS  
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  
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  
NC  
Voltage Feedback  
NC  
NC  
• Undervoltage Lockout with Hysteresis  
• Low Startup and Operating Current  
• Pb−Free Packages are Available  
V
V
CC  
C
Current Sense  
NC  
Output  
GND  
V
7(12)  
CC  
8
R /C  
T
Power Ground  
T
V
V
CC  
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 17 of this data sheet.  
Undervoltage  
Lockout  
7(11)  
R /C  
T
Output  
T
Oscillator  
6(10)  
4(7)  
Latching  
PWM  
DEVICE MARKING INFORMATION  
See general marking information in the device marking  
section on page 19 of this data sheet.  
Power  
Ground  
5(8)  
Voltage  
Feedback  
Input  
+
−
2(3)  
Output  
Compensation  
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, 2007  
1
Publication Order Number:  
February, 2007 − Rev. 9  
UC3842B/D  
1234567...21

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