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DS3991
Low-Cost CCFL Controller
Full-Featured Single-Channel CCFL Controller
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Status
Active: In Production.
Description
The DS3991 is a controller for cold-cathode fluorescent lamps (CCFLs) that are used to backlight liquid-crystal displays (LCDs). The DS3991 is available for both push-pull and half-bridge drive topologies.
The DS3991 converts a DC voltage (5V to 24V) to the high-voltage (300VRMS to 1400VRMS) AC waveform that is required to power the CCFLs. The push-pull and halfbridge drive schemes use a minimal number of external components, which reduces component and assembly cost and makes the printed circuit board (PCB) design easy to implement. Both drive schemes provide an efficient DC to AC conversion and produce near-sinusoidal waveforms.
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Data Sheet
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Key Features
- CCFL Controller for Backlighting LCD Panels
- Minimal External Components Required
- Lamp Fault Monitoring for Lamp-Open, Lamp-Overcurrent, Failure-to-Strike, and Overvoltage Conditions
- Accurate (±5%) On-Board Oscillator for Lamp Frequency (40kHz to 80kHz)
- Accurate (±5%) On-Board Oscillator for DPWM Burst-Dimming Frequency (80Hz to 300Hz)
- Device Supply Undervoltage Lockout
- Inverter Supply Undervoltage and Overvoltage Lockouts
- Soft-Start on Burst-Dimming Minimizes Audible Transformer Noise
- Strike Frequency Boost
- 100% to < 10% Dimming Range
- Low Cost
- Single-Supply Operation Range: 4.5V to 5.5V
- Temperature Range: -40°C to +85°C
- 16-Pin SO Package (150 mils)
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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 |
Industry Qualified |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Oper. Temp.
(°C) |
| min |
max |
max w/pins |
| DS3991 |
4.5 |
24 |
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1 |
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Fixed PWM |
No |
| Automotive - AECQ100 | | Automotive - General |
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61.9 |
-40 to +85 |
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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: Typical Push-Pull Application
More Information
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Information Index
Rev 1;
2008-02-19
This page last modified: 2009-07-31
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