Datasheet Linear Technology LT3791

Manufacturer	Linear Technology
Series	LT3791

60V 4-Switch Synchronous Buck-Boost LED Driver Controller

Datasheets

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PDF, 415 Kb, Revision: C, File uploaded: Sep 19, 2017

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Packaging

	LT3791EFE#PBF	LT3791EFE#TRPBF	LT3791HFE#PBF	LT3791HFE#TRPBF	LT3791IFE#PBF	LT3791IFE#TRPBF	LT3791MPFE#PBF	LT3791MPFE#TRPBF
N	1	2	3	4	5	6	7	8
Package	TSSOP-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing	TSSOP-38 Package Outline Drawing
Package Code	FE	FE	FE	FE	FE	FE	FE	FE
Package Index	05-08-1772	05-08-1772	05-08-1772	05-08-1772	05-08-1772	05-08-1772	05-08-1772	05-08-1772
Pin Count	38	38	38	38	38	38	38	38

Parametrics

Parameters / Models	LT3791EFE#PBF	LT3791EFE#TRPBF	LT3791HFE#PBF	LT3791HFE#TRPBF	LT3791IFE#PBF	LT3791IFE#TRPBF	LT3791MPFE#PBF	LT3791MPFE#TRPBF
Architecture	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode	Constant Frequency Current Mode
Demo Boards	DC1666A	DC1666A	DC1666A	DC1666A	DC1666A	DC1666A	DC1666A	DC1666A
Design Tools	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model	LTspice File,LTpowerCAD Model
Dimming	PWM, Analog	PWM, Analog	PWM, Analog	PWM, Analog	PWM, Analog	PWM, Analog	PWM, Analog	PWM, Analog
Export Control	no	no	no	no	no	no	no	no
Features	Output Disconnect	Output Disconnect	Output Disconnect	Output Disconnect	Output Disconnect	Output Disconnect	Output Disconnect	Output Disconnect
Frequency, kHz	700	700	700	700	700	700	700	700
Ishutdown, µA	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1
Isupply, mA	3	3	3	3	3	3	3	3
Max Number of LEDs	100W+	100W+	100W+	100W+	100W+	100W+	100W+	100W+
Monolithic	no	no	no	no	no	no	no	no
Number of Outputs	1	1	1	1	1	1	1	1
Operating Temperature Range, °C	0 to 85	0 to 85	-40 to 125	-40 to 125	-40 to 85	-40 to 85	-55 to 125	-55 to 125
Output Current, A	10	10	10	10	10	10	10	10
Switch Current, A	25	25	25	25	25	25	25	25
Synchronous	yes	yes	yes	yes	yes	yes	yes	yes
Topology	Buck-Boost, LED Driver	Buck-Boost, LED Driver	Buck-Boost, LED Driver	Buck-Boost, LED Driver	Buck-Boost, LED Driver	Buck-Boost, LED Driver	Buck-Boost, LED Driver	Buck-Boost, LED Driver
Vin Max, V	60	60	60	60	60	60	60	60
Vin Min, V	4.7	4.7	4.7	4.7	4.7	4.7	4.7	4.7
Vout Max, V	60	60	60	60	60	60	60	60

Eco Plan

	LT3791EFE#PBF	LT3791EFE#TRPBF	LT3791HFE#PBF	LT3791HFE#TRPBF	LT3791IFE#PBF	LT3791IFE#TRPBF	LT3791MPFE#PBF	LT3791MPFE#TRPBF
RoHS	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant	Compliant

Design Notes

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60V Buck-Boost Controller Drives High Power LEDs, Charges Batteries and Regulates Voltage with Up to 98.5% Efficiency at 100W and Higher &mdash DN501
PDF, 92 Kb, File published: Mar 9, 2012
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60V Buck-Boost Controller Drives High Power LEDs, Charges
Batteries and Regulates Voltage with Up to 98.5% Efficiency at
100W and Higher вЂ“ Design Note 501
Keith Szolusha Buck-Boost Controller Drives 100W LED String for
Airplane and Truck Lights
Airplanes and big trucks with 24V batteries need powerful, efп¬Ѓcient and robust headlights and spotlights.
FigureВ 1 shows a 33.3V, 3A (nine Luminus SSR-90 LEDs)
VIN
15V TO 58V RIN
0.003О© VIN CVIN
1ОјF TG1 INTVCC BG1
LT3791 SHORTLED OPENLED OPENLED PWM DIM PWM
IVINMON
ISMON
CLKOUT
VREF 0.1ОјF
DIM D2 4.7ОјF
10V M2 0.1ОјF
L1 10ОјH M4 1M M3 34.2k 98 RLED
0.033О© SNSN
PGND
BG2 33.3VLED
3A …

Articles

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Meet Green Standards in 24VAC and 12VAC Lighting Systems: Replace Halogen Bulbs with LEDs Driven by High Power Factor, High Efficiency Converter &mdash LT Journal
PDF, 4.0 Mb, File published: Oct 9, 2013
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Meet Green Standards in 24VAC and 12VAC Lighting
Systems: Replace Halogen Bulbs with LEDs Driven by
High Power Factor, High Efficiency Converter
Keith Szolusha LEDs are increasingly used in 24VAC and 12VAC lighting systems as a robust,
energy efficient and high performance alternative to halogen lamps. Power
converters that drive the LEDs should have a high power factor (above 90% in order
to meet generally accepted green standards), should be efficient, use a minimal
number of components and should run cool. They do not need isolation.
One solution that meets these requirements combines a rectifier bridge and a
current-controlled synchronous step-up/
step-down converter. Specifically, a synchronous 4-switch buck-boost converter
can be paired with a 4-switch ideal diode rectifier bridge for high power LEDs; lower
power solutions can use a standard diode
bridge. Both solutions are shown here.
The LT3791 60V 4-switch synchronous
buck-boost controller IC can drive constant current (either DC or pulsating) into PVIN
24VRMS
PULSATING 120Hz M5 RIN
0.003О© M6 CIN
1ВµF
50V 51О©
0.1ВµF TG2
24VAC …

Model Line

Series: LT3791 (8)

LT3791EFE#PBF LT3791EFE#TRPBF LT3791HFE#PBF LT3791HFE#TRPBF LT3791IFE#PBF LT3791IFE#TRPBF LT3791MPFE#PBF LT3791MPFE#TRPBF

Manufacturer's Classification

Power Management > LED Driver ICs > Buck-Boost LED Drivers
Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Switching Regulators | Extended Temperature (H & MP) LED Drivers