LT3491EDC#TRPBF vs LM3431QMHX/NOPB
| Part Number |
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| Category | PMIC - LED Drivers | PMIC - LED Drivers |
| Manufacturer | Analog Devices Inc. | Texas Instruments |
| Description | IC LED DRVR RGLTR DIM 260MA 6DFN | IC LED DRIVER CTRLR DIM 28HTSSOP |
| Package | Tube | Tape & Reel (TR) |
| Series | - | Automotive, AEC-Q100 |
| Type | DC DC Regulator | DC DC Controller |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 6-WFDFN Exposed Pad | 28-PowerTSSOP (0.173\", 4.40mm Width) |
| Supplier Device Package | 6-DFN (2x2) | 28-HTSSOP |
| Topology | Step-Up (Boost) | Step-Up (Boost) |
| Applications | Backlight | Backlight |
| Number of Outputs | 1 | 3 |
| Voltage - Output | 27V | - |
| Frequency | 2.3MHz | 1MHz |
| Current - Output / Channel | 260mA (Switch) | - |
| Internal Switch(s) | Yes | No |
| Dimming | PWM | Analog, PWM |
| Voltage - Supply (Max) | 12V | 36V |
| Voltage - Supply (Min) | 2.5V | 4.5V |
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1. What is an LED driver for?
The main role of LED drivers is to provide a stable operating current for LEDs. Since LEDs are very sensitive to current, too high a current can cause them to be damaged or their lifespan to be shortened, while too low a current cannot guarantee brightness. Therefore, a suitable driver can ensure that the LED works under safe and efficient conditions.
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2. Is an LED driver just a power supply?
Not exactly. Although the LED driver does provide power, it is more than just a simple power converter. It also contains complex circuits to accurately control the output voltage and current, and sometimes includes dimming, temperature protection and other functions.
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3. How can I tell if an LED driver is broken?
If the LED does not light up or the brightness drops significantly.
The driver is heating abnormally.
There is a distinct burnt smell.
Measure the input and output voltage/current and it does not meet the specification.
Test the status of its internal components through professional equipment. -
4. Can I run an LED without a driver?
Yes, but additional circuits (such as resistors) are required to limit the current. However, this method is less efficient and difficult to maintain a stable current, which may lead to poor LED performance or shortened life.
