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UC3842A/D

更新时间： 2024-11-03 23:38:59
品牌 Logo 应用领域
摩托罗拉 - MOTOROLA 控制器
页数 文件大小 规格书
14页 403K
描述
High Performance Current Mode Controller

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UC3842A/D 数据手册

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Order this document by UC3842A/D  
HIGH PERFORMANCE  
CURRENT MODE  
CONTROLLERS  
The UC3842A, UC3843A series of high performance fixed frequency  
current mode controllers 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.  
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 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.  
N SUFFIX  
PLASTIC PACKAGE  
CASE 626  
8
1
D SUFFIX  
PLASTIC PACKAGE  
14  
CASE 751A  
The UCX842A has UYLO thresholds of 16 V (on) and 10 V (off), ideally  
suited for off–line converters. The UCX843A is tailored for lower voltage  
applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).  
1
(SO–14)  
• Trimmed Oscillator Discharge Current for Precise Duty Cycle Control  
• Current Mode Operation to 500 kHz  
PIN CONNECTIONS  
• Automatic Feed Forward Compensation  
Compensation  
Voltage Feedback  
Current Sense  
1
2
8
7
V
ref  
• Latching PWM for Cycle–By–Cycle Current Limiting  
• Internally Trimmed Reference with Undervoltage Lockout  
• High Current Totem Pole Output  
• Undervoltage Lockout with Hysteresis  
• Low Startup and Operating Current  
V
CC  
3
4
6
5
Output  
Gnd  
R
/C  
T
T
(Top View)  
• Direct Interface with Motorola SENSEFET Products  
1
14  
13  
Compensation  
NC  
V
ref  
2
NC  
3
4
12  
11  
Voltage Feedback  
NC  
V
V
CC  
C
5
6
10  
9
Current Sense  
NC  
Output  
Gnd  
Simplified Block Diagram  
R
/C  
7
8
Power Ground  
T
T
V
7(12)  
CC  
(Top View)  
V
V
CC  
ref  
5.0V  
Reference  
Undervoltage  
Lockout  
ORDERING INFORMATION  
Operating  
8(14)  
R
R
V
ref  
V
C
Undervoltage  
Lockout  
Temperature Range  
Device  
Package  
SO–14  
SO–14  
Plastic  
Plastic  
SO–14  
SO–14  
Plastic  
Plastic  
7(11)  
UC3842AD  
UC3843AD  
UC3842AN  
UC3843AN  
UC2842AD  
UC2843AD  
UC2842AN  
UC2843AN  
R
C
T
Output  
T
Oscillator  
6(10)  
4(7)  
Latching  
PWM  
T
= 0° to +70°C  
A
Power  
Ground  
5(8)  
Voltage  
Feedback  
Input  
+
–
2(3)  
Error  
Amplifier  
Current  
Sense  
Input  
Output  
Compensation  
1(1)  
3(5)  
T
= – 25° to +85°C  
A
Gnd  
5(9)  
Pin numbers in parenthesis are for the D suffix SO–14 package.  
Motorola, Inc. 1996  
Rev 1  
1234567...14

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