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UC3844B/D

更新时间： 2024-11-22 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
16页 437K
描述
High Performance Current Mode Controller

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UC3844B/D 数据手册

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Order this document by UC3844B/D  
The UC3844B, UC3845B 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  
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.  
HIGH PERFORMANCE  
CURRENT MODE  
CONTROLLERS  
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%.  
N SUFFIX  
PLASTIC PACKAGE  
CASE 626  
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.  
D1 SUFFIX  
PLASTIC PACKAGE  
CASE 751  
8
(SO–8)  
1
The UCX844B has UVLO thresholds of 16 V (on) and 10 V (off), ideally  
suited for off–line converters. The UCX845B is tailored for lower voltage  
applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).  
D SUFFIX  
PLASTIC PACKAGE  
CASE 751A  
14  
1
(SO–14)  
• 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  
• Latching PWM for Cycle–By–Cycle Current Limiting  
• Internally Trimmed Reference with Undervoltage Lockout  
• High Current Totem Pole Output  
PIN CONNECTIONS  
V
1
2
3
4
8
7
6
5
Compensation  
Voltage Feedback  
Current Sense  
ref  
V
CC  
Output  
Gnd  
R
/C  
T
T
(Top View)  
• Undervoltage Lockout with Hysteresis  
• Low Startup and Operating Current  
Compensation  
1
2
3
4
5
14  
13  
12  
11  
10  
9
V
ref  
NC  
Voltage Feedback  
NC  
NC  
V
CC  
V
C
Current Sense  
NC  
Output  
Gnd  
6
7
Simplified Block Diagram  
8
R
/C  
Power Ground  
T
T
V
7(12)  
CC  
(Top View)  
ORDERING INFORMATION  
Operating  
V
CC  
5.0V  
Reference  
V
Undervoltage  
Lockout  
ref  
8(14)  
R
R
Device  
Package  
Temperature Range  
V
ref  
Undervoltage  
Lockout  
V
C
UC384XBD  
UC384XBD1  
UC384XBN  
UC284XBD  
UC284XBD1  
UC284XBN  
UC384XBVD  
UC384XBVD1  
UC384XBVN  
SO–14  
SO–8  
7(11)  
T
= 0° to + 70°C  
A
Output  
6(10)  
Plastic  
SO–14  
SO–8  
R
/C  
T
Oscillator  
T
4(7)  
Latching  
PWM  
Power  
Ground  
T
= – 25° to + 85°C  
Voltage  
Feedback  
Input  
A
5(8)  
3(5)  
Plastic  
SO–14  
SO–8  
2(3)  
1(1)  
Error  
Amplifier  
Current  
Sense Input  
Output/  
Compensation  
T
= – 40° to +105°C  
A
Plastic  
Gnd  
5(9)  
X indicates either a 4 or 5 to define specific device  
part numbers.  
Pin numbers in parenthesis are for the D suffix SO–14 package.  
Motorola, Inc. 1996  
Rev 1  
1234567...16

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