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NCC3843BVDR2

更新时间： 2024-02-27 13:28:33
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其他 - ETC 模拟IC
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20页 298K
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Analog IC

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NCC3843BVDR2 数据手册

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UC3842B, UC3843B,  
UC2842B, UC2843B,  
NCV3843BV  
High Performance  
Current Mode Controllers  
http://onsemi.com  
The UC3842B, UC3843B 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 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.  
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.  
SO–8  
D1 SUFFIX  
CASE 751  
8
1
These devices are available in an 8–pin dual–in–line and surface  
mount (SO–8) plastic package as well as the 14–pin plastic surface  
mount (SO–14). The SO–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).  
SO–14  
D SUFFIX  
CASE 751A  
14  
1
PIN CONNECTIONS  
• Trimmed Oscillator for Precise Frequency Control  
• Oscillator Frequency Guaranteed at 250 kHz  
• Current Mode Operation to 500 kHz  
1
2
3
4
8
7
6
5
Compensation  
Voltage Feedback  
Current Sense  
V
V
ref  
CC  
Output  
Gnd  
R /C  
T
T
• Automatic Feed Forward Compensation  
• Latching PWM for Cycle–By–Cycle Current Limiting  
• Internally Trimmed Reference with Undervoltage Lockout  
• High Current Totem Pole Output  
(Top View)  
Compensation  
1
2
3
4
5
6
7
14  
13  
12  
11  
10  
9
V
ref  
NC  
Voltage Feedback  
NC  
NC  
V
V
CC  
• Undervoltage Lockout with Hysteresis  
C
• Low Startup and Operating Current  
Current Sense  
NC  
Output  
V
CC  
7(12)  
Gnd  
8
R /C  
T
Power Ground  
T
V
V
CC  
ref  
5.0V  
Reference  
Undervoltage  
Lockout  
(Top View)  
8(14)  
R
R
V
ref  
V
C
Undervoltage  
Lockout  
ORDERING INFORMATION  
See detailed ordering and shipping information in the package  
7(11)  
dimensions section on page 16 of this data sheet.  
R /C  
T
Output  
T
Oscillator  
6(10)  
4(7)  
Latching  
PWM  
Power  
Ground  
5(8)  
DEVICE MARKING INFORMATION  
See general marking information in the device marking  
section on page 17 of this data sheet.  
Voltage  
Feedback  
Input  
+
-
2(3)  
Error  
Amplifier  
Current  
Sense  
Input  
Output  
Compensation  
3(5)  
1(1)  
Gnd 5(9)  
Pin numbers in parenthesis are for the D suffix SO-14 package.  
Figure 1. Simplified Block Diagram  
Semiconductor Components Industries, LLC, 2001  
1
Publication Order Number:  
December, 2001 – Rev. 3  
UC3842B/D  
1234567...20

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