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DS3994

更新时间： 2024-11-22 04:15:15
品牌 Logo 应用领域
美信 - MAXIM 控制器
页数 文件大小 规格书
28页 538K
描述
4-Channel Cold-Cathode Fluorescent Lamp Controller

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Rev 0; 10/06  
4-Channel Cold-Cathode  
Fluorescent Lamp Controller  
General Description  
Features  
ꢀ High-Density CCFL Controller for LCD TV and  
The DS3994 is a 4-channel controller for cold-cathode  
fluorescent lamps (CCFLs) that backlight liquid crystal  
displays (LCDs) in TV and PC monitor applications. The  
DS3994’s features make it suitable for use in even the  
largest LCDs, while its low BOM cost makes it ideal for  
the entire range of LCD TVs and monitors.  
PC Monitor Backlights  
ꢀ Programmable Staggered Start for Burst Dimming  
on Each Channel  
ꢀ Strike Frequency Boost Option  
ꢀ Programmable Strike Time  
ꢀ Can Be Easily Cascaded  
ꢀ Minimal External Components  
ꢀ Analog Brightness Control  
The DS3994 can stagger the lamp bursts from each of  
the four channels. This feature allows scanning back-  
light schemes for video quality improvement to be  
implemented using a single CCFL controller IC, making  
it very simple and inexpensive to provide this enhance-  
ment. In addition, staggering the bursts from each  
channel can be used to minimize current ripple on the  
display power supply, which is especially important for  
larger LCDs. The relative stagger between each of the  
channels is programmable, so this feature can be tai-  
lored to the specific application.  
ꢀ Gate Driver Phasing Minimizes DC Supply Current  
Surges  
ꢀ Per-Channel Lamp Fault Monitoring for Lamp  
Open, Lamp Overcurrent, Failure to Strike, and  
Overvoltage Conditions  
ꢀ Accurate (±±2% On-Board Oscillator Lamp  
Frequency (±0kHz to 80kHz%  
The DS3994 uses a push-pull drive architecture but it  
can also support full and half bridge drive schemes.  
Contact the factory for more details.  
ꢀ Wide Range On-Board DPWM Burst-Dimming  
Oscillator (±±.5Hz to 440Hz%  
ꢀ Can Be Synchronized to External Sources for the  
Lamp and DPWM Frequencies  
Applications  
LCD Televisions  
ꢀ < 102 to 1002 Dimming Range  
ꢀ Soft-Start Minimizes Audible Transformer Noise  
ꢀ I±C-Compatible Serial Port and On-Board  
Nonvolatile (NV% Memory Allow Device  
Customization  
LCD PC Monitors  
Pin Configurations  
ꢀ 3-Byte NV User Memory for Storage of Serial  
Numbers and Date Codes  
TOP VIEW  
ꢀ 4.5V to 5.5V Single-Supply Operation  
ꢀ -40°C to +85°C Temperature Range  
ꢀ ±8-Pin SO (300 mils% Package  
LOSC  
A0  
1
2
3
4
5
6
7
8
9
28 LSYNC  
27 FAULT  
26 SCL  
PSYNC  
POSC  
BRIGHT  
SVM  
25 SDA  
24 OVD4  
23 LCM4  
22 GB4  
Ordering Information  
DS3994  
PART  
TEMP RANGE  
PIN-PACKAGE  
GA1  
DS3994Z+  
-40°C to +85°C  
28 SO-300  
GB1  
21 GA4  
+Denotes lead-free package.  
LCM1  
20 OVD3  
19 LCM3  
18 GB3  
OVD1 10  
GA2 11  
GB2 12  
17 GA3  
LCM2 13  
OVD2 14  
16  
V
CC  
15 GND  
Typical Operating Circuits appear at end of data sheet.  
SO-300  
______________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...28

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