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UC3842D PDF预览

UC3842D

更新时间: 2024-11-20 22:41:51
品牌 Logo 应用领域
恩智浦 - NXP 控制器
页数 文件大小 规格书
8页 75K
描述
Current-mode PWM controller

UC3842D 技术参数

生命周期:Obsolete零件包装代码:SOIC
包装说明:SOP, SOP14,.25针数:14
Reach Compliance Code:compliantECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.63
模拟集成电路 - 其他类型:SWITCHING CONTROLLER控制模式:CURRENT-MODE
控制技术:PULSE WIDTH MODULATION最大输入电压:25 V
最小输入电压:12 V标称输入电压:15 V
JESD-30 代码:R-PDSO-G14长度:8.65 mm
功能数量:1端子数量:14
最高工作温度:70 °C最低工作温度:
最大输出电流:1 A标称输出电压:2.5 V
封装主体材料:PLASTIC/EPOXY封装代码:SOP
封装等效代码:SOP14,.25封装形状:RECTANGULAR
封装形式:SMALL OUTLINE认证状态:Not Qualified
座面最大高度:1.75 mm子类别:Switching Regulator or Controllers
最大供电电流 (Isup):17 mA表面贴装:YES
切换器配置:SINGLE最大切换频率:400 kHz
技术:BIPOLAR温度等级:COMMERCIAL
端子形式:GULL WING端子节距:1.27 mm
端子位置:DUAL宽度:3.9 mm
Base Number Matches:1

UC3842D 数据手册

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Philips Semiconductors Linear Products  
Product specification  
Current-mode PWM controller  
UC3842  
DESCRIPTION  
PIN CONFIGURATIONS  
The UC3842 is available in an 8-Pin mini-DIP the necessary  
features to implement off-line, fixed-frequency current-mode control  
schemes with a minimal external parts count. This technique results  
in improved line regulation, enhanced load response characteristics,  
and a simpler, easier to design control loop. Topological advantages  
include inherent pulse-by-pulse current limiting.  
N Package  
COMP  
1
2
3
4
8
7
6
5
V
V
REF  
CC  
V
FB  
OUTPUT  
GROUND  
I
SENSE  
Protection circuitry includes built-in undervoltage lock-out and  
current limiting. Other features include fully-latched operation, a 1%  
trimmed bandgap reference, and start-up current less than 1mA.  
R
/C  
T
T
TOP VIEW  
These devices feature a totem-pole output designed to source and  
sink high peak current from a capacitive load, such as the gate of a  
power MOSFET. Consistent with N-channel power devices, the  
output is low in the OFF-state.  
D Package  
1
2
3
4
5
6
7
14  
13  
12  
11  
10  
9
V
COMP  
NC  
REF  
NC  
FEATURES  
V
V
CC  
FB  
Low start-up current (1mA)  
NC  
V
C
Automatic feed-forward compensation  
Pulse-by-pulse current limiting  
OUTPUT  
I
SENSE  
NC  
GROUND  
8
POWER GROUND  
R
/C  
T
T
Enhanced load response characteristics  
Undervoltage lock-out with hysteresis  
Double pulse suppression  
TOP VIEW  
High current totem-pole output  
APPLICATIONS  
Internally-trimmed bandgap reference  
400kHz operation, guaranteed min  
Off-line switched mode power supplies  
DC-to-DC converters UC3842  
BLOCK DIAGRAM  
7(11)  
(12)7  
V
CC  
UVLO  
34V  
V
REF  
8(14)  
5.0V  
50mA  
5V  
REF  
(9)5  
(7)4  
S/R  
GND  
6V  
16V  
2.5V  
INTERNAL  
BIAS  
OSC  
R
/C  
T
T
6(10)  
OUTPUT  
S
ERROR  
AMP  
2R  
+
PWM  
LATCH  
(3)2  
(1)1  
(5)3  
R
V
FB  
R
CURRENT  
SENSE  
1V  
COMP  
COMPARATOR  
CURRENT  
SENSE  
5(8)  
NOTE:  
Pin numbers in parentheses refer to the D package.  
1100  
August 31, 1994  
853-0614 13721  

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