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DS3988
8-Channel Cold-Cathode Fluorescent Lamp Controller
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Status
Description
The DS3988 is an 8-channel controller for cold-cathode fluorescent lamps (CCFLs) used to backlight liquid crystal displays (LCDs) in TV and PC monitor applications. The DS3988 supports configurations of 1 to 8 lamps, and multiple DS3988 controllers can be cascaded to support applications requiring more than 8 lamps.
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Data Sheet
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Key Features
- High-Density CCFL Controller for LCD TV and PC Monitor Backlights
- Can Be Easily Cascaded to Support More Than 8 Lamps
- Minimal External Components
- Analog Brightness Control
- Per-Channel Lamp Control Ensures Equal Brightness Among Lamps and Maximizes Lamp Life
- 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 (±5%) Independent On-Board Oscillators for Lamp Frequency (40kHz to 80kHz) and DPWM Burst Dimming Frequency (22.5Hz to 440Hz)
- Can Be Synchronized to External Sources for the Lamp and DPWM Frequencies
- <10% to 100% Dimming Range
- Programmable Soft-Start Minimizes Audible Transformer Noise
- I²C-Compatible Serial Port and On-Board Nonvolatile (NV) Memory Allow Device Customization
- 8-Byte NV User Memory for Storage of Serial Numbers and Date Codes
- 4.5V to 5.5V Single-Supply Operation
- -40°C to +85°C Temperature Range
- 48-Lead TQFP (7mm x 7mm) Package
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Applications/Uses
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Key Specifications:
| CCFL Controllers |
| Part Number |
VIN
(V) |
VIN
(V) |
Topology |
Channels |
Dimming Interface |
Freq. |
EV Kit |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Oper. Temp.
(°C) |
Budgetary Price |
| min |
max |
max w/pins |
See Notes |
| DS3988 |
4.5 |
5.5 |
Push-Pull |
8 |
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Fixed PWM |
No |
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84.6 |
-40 to +85 |
$2.86 @1k |
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See All CCFL Controllers (14)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
More Information
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Information Index
Rev 0;
2006-02-27
This page last modified: 2010-05-21
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