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ML4876CR

更新时间： 2024-11-09 20:20:31
品牌 Logo 应用领域
飞兆/仙童 - FAIRCHILD 光电二极管
页数 文件大小 规格书
12页 177K
描述
Fluorescent Light Controller, 0.25A, 81kHz Switching Freq-Max, PDSO20, PLASTIC, SSOP-20

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ML4876CR 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
零件包装代码：SSOP包装说明：PLASTIC, SSOP-20
针数：20Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.66Is Samacsys：N
模拟集成电路 - 其他类型：FLUORESCENT LIGHT CONTROLLER控制技术：PULSE WIDTH MODULATION
最小输入电压：4.1 V标称输入电压：5 V
JESD-30 代码：R-PDSO-G20JESD-609代码：e0
长度：7.2 mm功能数量：1
端子数量：20最高工作温度：70 °C
最低工作温度：最大输出电流：0.25 A
封装主体材料：PLASTIC/EPOXY封装代码：SSOP
封装等效代码：SSOP20,.3封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, SHRINK PITCH峰值回流温度（摄氏度）：NOT SPECIFIED
电源：5 V认证状态：Not Qualified
座面最大高度：2 mm子类别：Switching Regulator or Controllers
标称供电电压 (Vsup)：5 V表面贴装：YES
切换器配置：PUSH-PULL最大切换频率：81 kHz
温度等级：COMMERCIAL端子面层：Tin/Lead (Sn/Pb)
端子形式：GULL WING端子节距：0.65 mm
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：5.3 mmBase Number Matches：1

ML4876CR 数据手册

 浏览型号ML4876CR的Datasheet PDF文件第2页浏览型号ML4876CR的Datasheet PDF文件第3页浏览型号ML4876CR的Datasheet PDF文件第4页浏览型号ML4876CR的Datasheet PDF文件第5页浏览型号ML4876CR的Datasheet PDF文件第6页浏览型号ML4876CR的Datasheet PDF文件第7页 
June 1996  
Application Note 42010  
George A. Hall  
and Urs Mader  
Theory and Application of the ML4874  
and ML4876 LCD Backlight Controller ICs  
• Improved Efficiency (≈95%)  
INTRODUCTION  
• Surface mount SSOP package of this circuit is available  
The ML4874 and ML4876 are high performance backlight  
and dimming controller integrated circuits specifically  
designed to control miniature cold-cathode fluorescent  
lamps (CCFLs) for portable computing and instrumentation  
equipment.  
for space economy.  
FUNCTIONAL BLOCK DIAGRAM  
All controllers in this series consist of two main functional  
blocks.  
These devices are designed to achieve high efficiency as  
well as high application flexibility. Some of the key  
features are:  
• A buck current regulator block that controls the lamp  
current.  
• A current fed lamp driver block that uses a self-  
synchronizing scheme for low loss resonant threshold  
detect switching (RTD), and facilitates flicker free  
dimming.  
• Low Standby Current (<10µA)  
• Differential Output Lamp Driver  
• Up to 30% Less Power for Same Light Output  
• Allow Use of all N-channel FETs  
The simplified block diagram of the ML4874 is shown in  
Figure 1. The timing of the circuit is controlled by setting  
the frequency of the oscillator by components connected  
to pins 4 and 9 and ground. For ML4876, only pin 9 is  
used for C . R is built-in internally. See Figure 14. For  
ML4874, there is a zener diode at pin 2 to set the voltage,  
whereas the ML4876 does not have this feature.  
• Resonant Threshold Detect (RTD) Switching  
• Regulated lamp current by means of a buck switching  
converter which is synchronized to the lamp driver  
frequency for flicker free operation. The duty cycle is  
capable of operating from 0% to 100%.  
• Uses off the shelf power components including  
magnetic components.  
T
T
AZR  
2
VDD  
13  
B ON  
19  
B OFF  
B SYNC OUT  
11  
20  
L RTD  
10  
14  
DR2  
DR2  
L GATE1  
VDD  
DR1  
DR1  
DR3  
ONE  
SHOT  
NEG  
EDGE  
DELAY  
L GATE2  
L ILIM  
16  
6
LINEAR  
REGULATOR  
HVDD  
VREF  
12  
5
S
Q
Q
–
R
+
MASTER  
BIAS  
& UVLO  
Q
Q
T
0.5V  
ON/OFF 15  
RESONANT  
THRESHOLD  
DETECTOR  
LEA OUT  
LEA–  
8
7
–
Q
Q
S
+
16V  
R
–
–
+
+
0.2V  
CLK  
OSCILLATOR  
3
17  
PGND  
18  
1
4
9
SS CAP  
GND  
NC  
RT  
CT  
Figure 1. Block Diagram of the ML4874.  
REV. 1.0 10/25/2000  
1
1234567...12

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