LM3421

AKTIV

N-Kanal-Controller für Konstantstrom-LED-Treiber mit Serien-DIM FET-Treiber

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Datenblatt

document-pdfAcrobat LM342x N -Channel Controllers for Constant-Current LED Drivers datasheet (Rev. G) (Englisch) PDF | HTML

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LM3421

AKTIV

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Produktdetails

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

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)

16

32 mm² (5 mm × 6.4 mm)

V_IN Range From 4.5 V to 75 V
High-Side Adjustable Current Sense
2-Ω, 1-A Peak MOSFET Gate Driver
Input Undervoltage and Output Overvoltage Protection
PWM and Analog Dimming
Cycle-by-Cycle Current Limit
Programmable Switching Frequency
Zero Current Shutdown and Thermal Shutdown
LED Output Status Flag (LM3423 and LM3423-Q0 Only)
Fault Status Flag and Timer(LM3423 and LM3423-Q0 Only)

V_IN Range From 4.5 V to 75 V
High-Side Adjustable Current Sense
2-Ω, 1-A Peak MOSFET Gate Driver
Input Undervoltage and Output Overvoltage Protection
PWM and Analog Dimming
Cycle-by-Cycle Current Limit
Programmable Switching Frequency
Zero Current Shutdown and Thermal Shutdown
LED Output Status Flag (LM3423 and LM3423-Q0 Only)
Fault Status Flag and Timer(LM3423 and LM3423-Q0 Only)

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.

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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Technische Dokumentation

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Top-Dokumentation	Typ	Titel	Format-Optionen
*	Datenblatt	LM342x N -Channel Controllers for Constant-Current LED Drivers datasheet (Rev. G)	PDF \| HTML	30.07.2019
	Auswahlhilfe	Power Management Guide 2018 (Rev. R)		25.06.2018
	Technischer Artikel	Driving LEDs: topology matters	PDF \| HTML	26.02.2016
	Anwendungshinweis	AN-1656 Design Challenges of Switching LED Drivers (Rev. A)		03.05.2013
	Anwendungshinweis	AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A)		23.04.2013

Design und Entwicklung

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