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UC2845N

更新时间： 2024-02-13 07:00:36
品牌 Logo 应用领域
飞思卡尔 - FREESCALE 开关光电二极管控制器
页数 文件大小 规格书
14页 380K
描述
HIGH PERFORMANCE CURRENT MODE CONTROLLERS

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UC2845N 数据手册

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Order this document by UC3844/D  
HIGH PERFORMANCE  
CURRENT MODE  
CONTROLLERS  
The UC3844, UC3845 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.  
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 for  
50% to 70%.  
N SUFFIX  
PLASTIC PACKAGE  
CASE 626  
8
1
D SUFFIX  
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.  
The UCX844 has UVLO thresholds of 16 V (on) and 10 V (off), ideally  
suited for off–line converters. The UCX845 is tailored for lower voltage  
applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).  
PLASTIC PACKAGE  
14  
CASE 751A  
(SO–14)  
1
PIN CONNECTIONS  
• 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  
• Input Undervoltage Lockout with Hysteresis  
• Low Startup and Operating Current  
• Direct Interface with Motorola SENSEFET Products  
Compensation  
Voltage Feedback  
Current Sense  
1
2
8
7
V
ref  
V
CC  
3
4
6
5
Output  
Gnd  
R
/C  
T
T
(Top View)  
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  
8(14)  
5.0V  
Reference  
Undervoltage  
Lockout  
ORDERING INFORMATION  
Operating  
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)  
UC3844D  
UC3845D  
UC3844N  
UC3845N  
UC2844D  
UC2845D  
UC2844N  
UC2845N  
R
4(7)  
C
Output  
6(10)  
T
T
Flip  
Flop  
&
Latching  
PWM  
Oscillator  
T
= 0° to +70°C  
A
Voltage  
Feedback  
PWR GND  
5(8)  
+
–
2(3)  
Current  
Sense  
3(5)  
Error  
Amplifier  
1(1)  
Output  
Comp.  
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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