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UC2845AQD PDF预览

UC2845AQD

更新时间： 2024-11-23 04:48:15
品牌 Logo 应用领域
德州仪器 - TI 控制器
页数 文件大小 规格书
15页 591K
描述
CURRENT-MODE PWM CONTROLLER

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UC2845AQD 数据手册

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UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ  
CURRENT-MODE PWM CONTROLLER  
SGLS164 – APRIL 2003  
D 8-PIN PACKAGE  
(TOP VIEW)  
D
D
Extended Temperature Performance of  
–40°C to 125°C  
Optimized for Off-line and DC to DC  
Converters  
COMP  
V
V
1
2
3
4
8
7
6
5
REF  
CC  
V
FB  
D
D
D
D
D
D
D
D
D
D
D
Low Start Up Current (<0.5 mA)  
Trimmed Oscillator Discharge Current  
Automatic Feed Forward Compensation  
Pulse-by-Pulse Current Limiting  
Enhanced Load Response Characteristics  
Under-Voltage Lockout With Hysteresis  
Double Pulse Suppression  
I
OUTPUT  
GND  
SENSE  
R /C  
T
T
D 14-PIN PACKAGE  
(TOP VIEW)  
COMP  
NC  
V
REF  
1
2
3
4
5
6
7
14  
13  
12  
11  
10  
9
NC  
V
V
High Current Totem Pole Output  
Internally Trimmed Bandgap Reference  
500 kHz Operation  
FB  
NC  
CC  
V
C
I
OUTPUT  
GND  
SENSE  
NC  
Low R Error Amp  
O
R /C  
PWR GND  
8
T
T
description  
The UC2842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC2842/3/4/5  
family. Providing the necessary features to control current mode switched mode power supplies, this family has the  
following improved features. Start up current is guaranteed to be less than 0.5 mA. Oscillator discharge is trimmed  
to 8.3 mA. During under voltage lockout, the output stage can sink at least 10 mA at less than 1.2 V for V  
5 V.  
over  
CC  
The difference between members of this family are shown in the table below.  
PART NUMBER  
UC2842A  
UVLO ON  
16 V  
UVLO OFF  
10 V  
MAXIMUM DUTY CYCLE  
<100%  
<100%  
<50%  
UC2843A  
8.5 V  
7.9 V  
UC2844A  
16 V  
10 V  
UC2845A  
8.5 V  
7.9 V  
<50%  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
Copyright 2003, Texas Instruments Incorporated  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of Texas Instruments  
standard warranty. Production processing does not necessarily include  
testing of all parameters.  
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567...15

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UC2845AQD 替代型号

型号 品牌 替代类型 描述 数据表
UC2845AQDR TI

完全替代

 CURRENT-MODE PWM CONTROLLER

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