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CS3842AGD8 PDF预览

CS3842AGD8

更新时间: 2024-01-21 02:25:39
品牌 Logo 应用领域
樱桃 - CHERRY /
页数 文件大小 规格书
6页 158K
描述
Off-Line Current Mode PWM Control Circuit with Undervoltage Lockout

CS3842AGD8 技术参数

是否无铅: 含铅是否Rohs认证: 不符合
生命周期:Active零件包装代码:SOIC
包装说明:SOP,针数:8
Reach Compliance Code:unknown风险等级:5.74
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:11.5 V标称输入电压:15 V
JESD-30 代码:R-PDSO-G8JESD-609代码:e0
长度:4.9 mm湿度敏感等级:NOT SPECIFIED
功能数量:1端子数量:8
最高工作温度:70 °C最低工作温度:
最大输出电流:1 A封装主体材料:PLASTIC/EPOXY
封装代码:SOP封装形状:RECTANGULAR
封装形式:SMALL OUTLINE峰值回流温度(摄氏度):NOT SPECIFIED
认证状态:COMMERCIAL座面最大高度:1.75 mm
表面贴装:YES切换器配置:SINGLE
温度等级:COMMERCIAL端子面层:TIN LEAD
端子形式:GULL WING端子节距:1.27 mm
端子位置:DUAL处于峰值回流温度下的最长时间:NOT SPECIFIED
宽度:3.9 mmBase Number Matches:1

CS3842AGD8 数据手册

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Typical Performance Characteristics  
Oscillator Duty Cycle vs RT  
Oscillator Frequency vs CT  
100  
90  
900  
800  
700  
600  
500  
400  
300  
200  
100  
R
T =680  
80  
70  
60  
50  
40  
RT =1.5kΩ  
30  
20  
10  
RT =10kΩ  
.0005  
.001  
.002 .003  
.005  
.01  
.02  
.03 .04 .05  
100  
200 300 400 500 700 1k  
2k  
3k 4k 5k 7k 10k  
CT (µF)  
RT ()  
Test Circuit  
VREF  
RT  
2N2222  
VCC  
A
100k  
COMP  
VREF  
4.7kΩ  
1kΩ  
0.1µF  
0.1µF  
VFB  
VCC  
ERROR AMP  
ADJUST  
1kΩ  
1W  
5kΩ  
Sense  
ADJUST  
4.7kΩ  
VOUT  
VOUT  
Sense  
OSC  
Gnd  
Gnd  
CT  
Circuit Description  
Undervoltage Lockout  
During Undervoltage Lockout (Figure 1), the output driv-  
er is biased to a high impedance state. The output should  
be shunted to ground with a resistor to prevent output  
leakage current from activating the power switch.  
VCC  
ON/OFF Command  
to reset of IC  
CSX842A CSX843A  
VON  
VOFF  
16V  
10V  
8.4V  
7.6V  
PWM Waveform  
To generate the PWM waveform, the control voltage from  
the error amplifier is compared to a current sense signal  
which represents the peak output inductor current (Figure  
2). An increase in VCC causes the inductor current slope to  
increase, thus reducing the duty cycle. This is an inherent  
feed-forward characteristic of current mode control, since  
the control voltage does not have to change during  
changes of input supply voltage.  
ICC  
<15mA  
<1mA  
When the power supply sees a sudden large output cur-  
rent increase, the control voltage will increase allowing the  
duty cycle to momentarily increase. Since the duty cycle  
tends to exceed the maximum allowed to prevent trans-  
VCC  
VON VOFF  
Figure 1: Typical Undervoltage Characteristics  
4

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