LT3791 Datasheet PDF - Linear Technology

www.Datasheet-PDF.com

LT3791
Linear Technology

Part Number LT3791
Description 60V 4-Switch Synchronous Buck-Boost LED Driver Controller
Page 28 Pages


LT3791 datasheet pdf
Download PDF
LT3791 pdf
View PDF for Mobile


No Preview Available !

FEATURES
n 4-Switch Single Inductor Architecture Allows VIN
Above, Below or Equal to VOUT
n Wide VIN Range: 4.7V to 60V
n Wide VOUT Range: 0V to 60V (55V LED)
n ±2% Output Voltage Accuracy
n Synchronous Switching: Up to 98.5% Efficiency
n ±6% LED Current Accuracy: 0V ≤ VOUT < 60V
n VOUT Disconnected from VIN During Shutdown
n Accurate Rail-to-Rail LED Current Sense with
Monitor Output
n Input Current Sense with Monitor Output
n PWM and Analog Dimming
n Capable of 100W or greater per IC
n 38-Lead TSSOP with Exposed Pad
APPLICATIONS
n Automotive Headlamps/Running Lamps
n General Purpose Lighting
LT3791
60V 4-Switch Synchronous
Buck-Boost LED Driver
Controller
DESCRIPTION
The LT®3791 is a synchronous 4-switch buck-boost LED
driver and voltage regulator controller. The controller
operates from input voltages above, below, or equal to
the output voltage. The LT3791 has a wide 4.7V to 60V
input and 0V to 60V output range along with seamless
transitions between operating modes. A ground reference
voltage FB pin serves as the input for several LED protec-
tion features and also makes it possible for the converter
to operate as a constant-voltage source. The LT3791 is
ideal for a wide variety of applications.
The LT3791 runs in forced continuous mode, which is
ideal for systems with stringent EMI requirements. Fault
protection is provided to survive and report an open or
shorted LED condition. A timer allows the LT3791 to
continue to run, latch off or restart when a fault occurs.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered and True Color PWM
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
www.DataSheet.co.kr
TYPICAL APPLICATION
VIN
15V TO 58V
499k
15.8k
28k
98.5% Efficient 100W (33.3V 3A) Buck-Boost LED Driver
0.003Ω
1µF
50Ω
470nF
VIN
IVINN
IVINP
INTVCC
EN/UVLO
OVLO
200k
200k
SHORTLED
OPENLED
LT3791
0.1µF
PWM
IVINMON
ISMON
CLKOUT
VREF
CTRL
SS SYNC VC
RT
INTVCC
BST2
BST1
TG1
SWI
BG1
SNSP
SNSN
PGND
BG2
SW2
TG2
FB
ISP
ISN
PWMOUT
SGND
10nF
2.2k
10nF
86.6k
300kHz
0.1µF
0.1µF
10µH
0.004Ω
2.2µF
100V
×5
4.7µF
1M
34.2k
4.7µF
50V
×5
0.033Ω
3A, 100W
LED POWER
3791 TA01a
Efficiency vs VIN
100
98 BOOST
96
BUCK-BOOST
BUCK
94
92
90
10
20 30 40 50
INPUT VOLTAGE (V)
60
3791 TA01b
3791f
1
Datasheet pdf - http://www.DataSheet4U.net/



No Preview Available !

LT3791
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltages
Input Supply (VIN)......................................................60V
SW1, SW2.......................................................–1V to 60V
OPENLED, SHORTLED................................................15V
EN/UVLO, IVINP, IVINN, ISP, ISN...............................60V
INTVCC, (BST1-SW1), (BST2-SW2)..............................6V
TEST2, SYNC, RT, CTRL, OVLO, PWM........................6V
IVINMON, ISMON, FB, SS, VC, VREF............................6V
IVINP-IVINN, ISP-ISN, SNSP-SNSN........................±0.5V
SNSP, SNSN............................................................±0.3V
Operating Junction Temperature (Notes 2, 3)
LT3791E/LT3791I................................ –40°C to 125°C
LT3791H............................................. –40°C to 150°C
LT3791MP.......................................... –55°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
PIN CONFIGURATION
CTRL 1
SS 2
PWM 3
OPENLED 4
SHORTLED 5
VREF 6
ISMON 7
IVINMON 8
EN/UVLO 9
IVINP 10
IVINN 11
VIN
INTVCC
TG1
12
13
14
BST1 15
SW1 16
PGND 17
BG1 18
BG2 19
TOP VIEW
39
SGND
38 OVLO
37 FB
36 VC
35 RT
34 SYNC
33 CLKOUT
32 TEST2
31 PWMOUT
30 SGND
29 TEST1
28 SNSN
27 SNSP
26 ISN
25 ISP
24 TG2
23 NC
22 BST2
21 SW2
20 PGND
FE PACKAGE
38-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 28°C/W
www.DataSheet.co.kr EXPOSED PAD (PIN 39) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3791EFE#PBF
LT3791EFE#TRPBF
LT3791FE
38-Lead Plastic TSSOP
–40°C to 125°C
LT3791IFE#PBF
LT3791IFE#TRPBF
LT3791FE
38-Lead Plastic TSSOP
–40°C to 125°C
LT3791HFE#PBF
LT3791HFE#TRPBF
LT3791FE
38-Lead Plastic TSSOP
–40°C to 150°C
LT3791MPFE#PBF
LT3791MPFE#TRPBF
LT3791FE
38-Lead Plastic TSSOP
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VEN/UVLO = 12V unless otherwise noted.
PARAMETER
Input
VIN Operating Voltage
VIN Shutdown IQ
VIN Operating IQ (Not Switching)
CONDITIONS
VEN/UVLO = 0V
FB = 1.3V, RT = 59.0k
MIN TYP MAX
4.7
0.1
3.0
60
1
4
UNITS
V
µA
mA
3791f
2
Datasheet pdf - http://www.DataSheet4U.net/



No Preview Available !

LT3791
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VEN/UVLO = 12V unless otherwise noted.
PARAMETER
Logic Inputs
EN/UVLO Falling Threshold
EN/UVLO Rising Hysteresis
EN/UVLO Input Low Voltage
EN/UVLO Pin Bias Current Low
EN/UVLO Pin Bias Current High
CTRL Input Bias Current
CTRL Latch-Off Threshold
OVLO Rising Shutdown Voltage
OVLO Falling Hysteresis
Regulation
VREF Voltage
VREF Line Regulation
V(ISP-ISN) Threshold
ISP Bias Current
ISN Bias Current
LED Current Sense Common Mode Range
LED Current Sense Amplifier gm
ISMON Monitor Voltage
Input Current Sense Threshold V(IVINP-IVINN)
IVINP Bias Current
IVINN Bias Current
Input Current Sense Common Mode Range
Input Current Sense Amplifier gm
IVINMON Monitor Voltage
FB Regulation Voltage
FB Line Regulation
FB Amplifier gm
FB Pin Input Bias Current
VC Standby Input Bias Current
VSENSE(MAX) (VSNSP-SNSN)
Fault
SS Pull-Up Current
SS Discharge Current
FB Overvoltage Rising Threshold
Open LED Rising Threshold (VFB)
CONDITIONS
IVIN Drops Below 1µA
VEN/UVLO = 1V
VEN/UVLO = 1.6V
VCTRL = 1V
4.7V < VIN < 60V
VCTRL = 2V
VCTRL = 1100mV
VCTRL = 700mV
VCTRL = 300mV
www.DataSheet.co.kr
V(ISP-ISN) = 100mV
3V ≤ VIVINP ≤ 60V
V(IVINP-IVINN) = 50mV
4.7V < VIN < 60V
FB in Regulation
PWM = 0V
Boost
Buck
VSS = 0V
V(ISP-ISN) = 0V
MIN TYP MAX
l 1.16
2
l 2.85
1.2
15
3
10
20
175
3
75
1.24
0.3
4
100
50
3.15
l 1.96
97.5
l 94
87
l 84
47.5
l 46
6.5
l5
0
l 0.96
l 46.5
3
l 0.96
1.194
l 1.176
–20
l 42
l –56
2.00
0.002
100
100
90
90
50
50
10
10
110
20
890
1
50
90
20
2.12
1
1.2
1.2
0.002
565
100
51
–47.5
2.04
0.04
102.5
106
93
96
52.5
54
13.5
15
60
1.04
54
60
1.04
1.206
1.220
0.025
150
20
60
–39
14
1.4
1.22 1.25
l 1.127 1.15 1.173
UNITS
V
mV
V
µA
nA
nA
mV
V
mV
V
%/V
mV
mV
mV
mV
mV
mV
mV
mV
µA
µA
V
µS
V
mV
µA
µA
V
mS
V
V
V
%/V
µS
nA
nA
mV
mV
µA
µA
V
V
3791f
3
Datasheet pdf - http://www.DataSheet4U.net/



No Preview Available !

LT3791
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 12V, VEN/UVLO = 12V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Open LED Falling Threshold (VFB)
Open LED Falling Threshold (V(ISP-ISN))
Short LED Falling Threshold (VFB)
OPENLED Pin Output Impedance
VFB = 1.2V
l 1.078
5
380
1.1
10
400
1.1
1.122
15
450
2.0
V
mV
mV
SHORTLED Pin Output Impedance
1.1 2.0
SS Latch-Off Threshold
1.75 V
SS Reset Threshold
0.2 V
Oscillator
Switching Frequency
SYNC Frequency
RT = 147k
RT = 59.0k
RT = 29.1k
190 200
380 400
665 700
200
210
420
735
700
kHz
kHz
kHz
kHz
SYNC Pin Resistance to GND
90 kΩ
SYNC Threshold Voltage
0.3 1.5 V
Internal VCC Regulator
INTVCC Regulation Voltage
Dropout (VIN – INTVCC)
INTVCC Undervoltage Lockout
INTVCC Current Limit
PWM
IINTVCC = –10mA, VIN = 5V
VINTVCC = 4V
4.8 5
5.2
240 350
3.1 3.5
3.9
67
V
mV
V
mA
PWM Threshold Voltage
PWM Pin Resistance to GND
www.DataSheet.co.kr
0.3
90
1.5
V
PWMOUT Pull-Up Resistance
10 20
Ω
PWMOUT Pull-Down Resistance
5 10
Ω
NMOS Drivers
TG1, TG2 Gate Driver On-Resistance
Gate Pull-Up
Gate Pull-Down
VBST – VSW = 5V
2.6 Ω
1.7 Ω
BG1, BG2 Gate Driver On-Resistance
Gate Pull-Up
Gate Pull-Down
VINTVCC = 5V
1.2 Ω
TG Off to BG On Delay
BG Off to TG On Delay
TG1, TG2, tOFF(MIN)
CL = 3300pF
CL = 3300pF
RT = 59.0k
60
60
220 260
ns
ns
ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3791E is guaranteed to meet performance from 0°C
to 125°C junction temperature. Specification over the -40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls.
The LT3791I is guaranteed to meet performance specifications over the
–40°C to 125°C operating junction temperature range. The LT3791H is
guaranteed to meet performance specifications over the –40°C to 150°C
operating junction temperature range. The LT3791MP is guaranteed to
meet performance specifications over the –55°C to 150°C operating
junction temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated for junction temperatures greater
than 125°C.
Note 3: The LT3791 includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operation above
the specified absolute maximum operating junction temperature may
impair device reliability.
4
3791f
Datasheet pdf - http://www.DataSheet4U.net/



LT3791 datasheet pdf
Download PDF
LT3791 pdf
View PDF for Mobile


Related : Start with LT379 Part Numbers by
LT3790 60V Synchronous 4-Switch Buck-Boost Controller LT3790
Linear
LT3790 pdf
LT3791 60V 4-Switch Synchronous Buck-Boost LED Driver Controller LT3791
Linear Technology
LT3791 pdf
LT3791-1 60V 4-Switch Synchronous Buck-Boost Controller LT3791-1
Linear Technology
LT3791-1 pdf
LT3795 110V LED Controller LT3795
Linear Technology
LT3795 pdf
LT3796 100V Constant-Current and Constant-Voltage Controller LT3796
Linear Technology
LT3796 pdf
LT3797 Triple Output LED Driver Controller LT3797
Linear
LT3797 pdf
LT3798 Isolated No Opto-Coupler Flyback Controller LT3798
Linear Technology
LT3798 pdf
LT3799 Offline Isolated Flyback LED Controller LT3799
Linear Technology
LT3799 pdf

Index :   0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z   

This is a individually operated, non profit site. If this site is good enough to show, please introduce this site to others.
Since 2010   ::   HOME   ::   Contact