LM3431QMHX/NOPB vs AS1112B-BQFT

Part Number	LM3431QMHX/NOPB	AS1112B-BQFT
Category	PMIC - LED Drivers	PMIC - LED Drivers
Manufacturer	Texas Instruments	ams
Description	IC LED DRIVER CTRLR DIM 28HTSSOP	IC LED DRIVER LIN 100MA 32TQFN
Package	Tape & Reel (TR)	-Reel®
Series	Automotive, AEC-Q100	-
Type	DC DC Controller	Linear
Operating Temperature	-40°C ~ 125°C (TJ)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	28-PowerTSSOP (0.173\", 4.40mm Width)	32-VFQFN Exposed Pad
Supplier Device Package	28-HTSSOP	32-TQFN (5x5)
Topology	Step-Up (Boost)	Shift Register
Applications	Backlight	Backlight, Signage
Number of Outputs	3	16
Voltage - Output	-	15V
Frequency	1MHz	30MHz
Current - Output / Channel	-	100mA
Internal Switch(s)	No	Yes
Dimming	Analog, PWM	-
Voltage - Supply (Max)	36V	5.5V
Voltage - Supply (Min)	4.5V	3V

1. 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.
2. 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.
3. Why do I need to program an LED driver?

Programming is usually for advanced drivers with programmable functions, such as achieving finer dimming control, color adjustment or other intelligent functions. This allows users to customize the behavior of the driver according to specific needs.
4. Can I use an LED light without a driver?

As mentioned before, in theory yes, but in practice it is strongly recommended to use a proper driver to ensure optimal performance and extend life.