0
ACTIVE
Input voltage type |
DC/DC |
Topology |
Boost, Boost Controller, Buck-Boost, SEPIC |
Vin (min) (V) |
4.5 |
Vin (max) (V) |
75 |
Vout (max) (V) |
72 |
Vout (min) (V) |
3 |
Iout (max) (A) |
5 |
Iq (typ) (mA) |
2 |
Features |
Adjustable Switch Frequency, Enable/Shutdown, Thermal shutdown |
Operating temperature range (°C) |
-40 to 125 |
Dimming method |
Analog, PWM |
Number of channels |
1 |
Rating |
Catalog |
HTSSOP (PWP)-20-41.6 mm² 6.5 x 6.4
The LM3421 and LM3423 family of devices are versatile high voltage N-channel MOSFET controllers for LED drivers. They can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75 V, makes the these controllers ideal for illuminating LEDs in a large family of applications.
Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3421 and LM3423 devices use predictive off-time (PRO) control, which is a combination of peak current-mode control and a predictive off-timer. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward compensation.
The LM3421 and LM3423 devices include a high-voltage start-up regulator that operates over a wide input range of 4.5 V to 75 V. The internal PWM controller is designed for adjustable switching frequencies of up to 2 MHz, thus enabling compact solutions.
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