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LT3797IUKG#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36
LT3797
31
3797fa
For more information www.linear.com/LT3797
Typical applicaTions
Triple Buck Mode LED Driver for Common Anode LEDs
1000:1 PWM Dimming at 120HzEfficiency vs V
IN
V
IN
(V)
–15
70
EFFICIENCY (%)
75
80
85
90
100
–14
–13 –12 –11
3797 TA05b
–10 –9
95
PWMIN1-3 = 5V
PWM
5V/DIV
I
L1
5A/DIV
I
LED
5A/DIV
5µs/DIVV
IN
= –12V
3797 TA05c
CTRL1-3OVLO
8.45k
10k
R
T1
NTC
10k
RT SYNC SW1 BOOST INTV
CC
GND VC1-3
FBH1-3
SW2
35.7k
400kHz
0.1µF
L
PWR
47µH
PWM1-3
F LT 1-3SS1-3
C
IN1-3
22µF
×6
C
IN4
10µF
0.1µF
10µF
3797 TA05
10nF
4.7k
INTV
CC
200k
18.7k
17.3k
10k
ISP1-3
EN/UVLO
D1-D3: ON SEMICONDUCTOR MBRB2515L
L1-L3: WÜRTH 7443310470
LED1-LED3: LUMINUS PT39
L
PWR
: COILTRONICS SD25-470
M1, M3, M5: VISHAY SILICONIX Si4174DY
M2, M4, M6: INFINEON BSC130P03LS
Q1: DIODES INC. FMMTL718
R
T1
: MURATA NCP15XH103J03RC
*NEGATIVE INPUT VOLTAGE IS NECESSARY BECAUSE THE COMMON ANODES
OF THE LEDS OF THIS APPLICATION NEED TO BE CONNECTED TO GND
V
IN
ISN1-3
TG1-3
GATE1 SENSEP1 SENSEN1
0.01Ω 0.01Ω
C
OUT1
22µF ×2
C
OUT2
22µF ×2
C
OUT3
22µF ×2
M4
M3
M1
D1
0.1µF
(OPTIONAL)
0.1µF
(OPTIONAL)
0.1µF
(OPTIONAL)
V
IN
–15V TO –9V*
V
IN
V
IN
V
IN
V
IN
V
IN
V
IN
INTV
CC
V
IN
V
IN
V
REF
L1
4.7µH
L2
4.7µH
GATE2SENSEP2SENSEN2
LT3797
GATE3 SENSEP3 SENSEN3
ISN2
ISP2
0.05Ω0.05Ω
0.01Ω
5A
M6
M5
TG3TG2
ISN3
LED3
BLUE
LED2
GREEN
D3
L3
4.7µH
ISP3
FBH3
20k
75k
FBH2
20k
75k
0.05Ω
5A 5A
M2
TG1
ISN1
LED1
RED
ISP1
FBH1
20k
34k
D2
Q1
PWMIN1-3
LT3797
32
3797fa
For more information www.linear.com/LT3797
Typical applicaTions
Wide Input Range, Triple Buck-Boost LED Driver
1000:1 PWM Dimming at 120HzEfficiency and Output Current vs V
IN
V
IN
(V)
0
EFFICIENCY (%)
OUTPUT CURRENT (A)
80
90
100
15 25 40
3797 TA06b
70
60
50
1.4
1.8
2.2
1.0
0.6
0.2
5 10
20
30 35
PWM1-3 = 2V
OUTPUT CURRENT
EFFICIENCY
PWM
5V/DIV
I
L1
1A/DIV
I
LED
1A/DIV
2µs/DIVV
IN
= 24V
3797 TA06c
OVLO CTRL1-3V
REF
RT SYNC SW1 BOOST INTV
CC
GND VC1-3
FBH1-3
SW2
R
T
35.7k
400kHz
0.1µF
L
PWR
47µH
PWM1-3
F LT 1-3SS1-3
4.7µF
×3
1µF
1µF
0.1µF
(OPTIONAL)
0.1µF
(OPTIONAL)
0.1µF
(OPTIONAL)
0.25Ω
ISP1
4.7µF
0.1µF
10µF
3797 TA06
10nF
2k
47.5k
0.015Ω
M1
49.9k
75k
357k
V
IN
2.5V TO 40V
(60V TRANSIENT,
41V INTERNAL
OVLO PROTECTION)
ISP1-3
EN/UVLO
D1-D3: DIODES INC. PDS5100
L1-L3: COILTRONICS HC9-220R
L
PWR
: COILTRONICS SD25-470
M1, M3, M5: INFINEON BSC160N10NS3G
M2, M4, M6: VISHAY SILICONIX Si4401BDY
V
IN
V
IN
ISN1-3
TG1-3
ISN1
TG1
GATE1SENSEP1SENSEN1
1A
24V
1A
24V
1A
24V
M2
24.9k
562k
L1
22µH
FBH1
D1
GATE2SENSEP2SENSEN2
LT3797
GATE3SENSEP3SENSEN3
1µF
0.25Ω
ISP2
4.7µF
0.015Ω
M3
ISN2
TG2
M4
24.9k
562k
L2
22µH
FBH2
D2
1µF
0.25Ω
ISP3
4.7µF
0.015Ω
M5
ISN3
TG3
M6
24.9k
562k
L3
22µH
FBH3
D3
LT3797
33
3797fa
For more information www.linear.com/LT3797
Typical applicaTions
Triple SEPIC LED Driver
1000:1 PWM Dimming at 120HzEfficiency and Output Current vs V
IN
OVLO CTRL1-3V
REF
RT SYNC SW1 BOOST INTV
CC
GND VC1-3
FBH1-3
SW2
R
T
35.7k
400kHz
0.1µF
L
PWR
47µH
PWM1-3
F LT 1-3SS1-3
C
IN1-3
4.7µF
×3
C
IN4
1µF
0.1µF
10µF
3797 TA07
10nF
2k 562k
24.9k
47.5k
0.015Ω
M1
L1A
49.9k
487k
75k
V
IN
2.5V TO 40V
(60V TRANSIENT,
41V INTERNAL
OVLO PROTECTION)
ISP1-3
EN/UVLO
D1-D3: ON SEMICONDUCTOR MBRS3100
L1-L3: WÜRTH ELEKTRONIK 744870220
L
PWR
: COILTRONICS SD25-470
M1, M3, M5: INFINEON BSC160N10NS3G
M2, M4, M6: VISHAY SILICONIX Si4401BDY
V
IN
V
IN
ISN1-3
GATE1 TG1SENSEP1SENSEN1
D1
LT3797
M2
L1B
C
OUT1
4.7µF
×2
C
OUT2
4.7µF
×2
C
OUT3
4.7µF
×2
C
DC1
4.7µF
50V
C
DC2
4.7µF
50V
C
DC3
4.7µF
50V
•
•
0.25Ω
0.015Ω
M3
L2A
GATE2 TG2SENSEP2SENSEN2
D2
M4
L2B
•
•
0.015Ω
M5
L3A
GATE1 TG1SENSEP1SENSEN1
D3
1A
24V
M6
ISN3
1A
24V
0.1µF
(OPTIONAL)
0.1µF
(OPTIONAL)
0.1µF
(OPTIONAL)
1A
24V
ISP3
L3B
•
•
0.25Ω
ISN2
ISP2
0.25Ω
ISN1
ISP1
V
IN
(V)
0
EFFICIENCY (%)
OUTPUT CURRENT (A)
80
90
40
3797 TA07b
70
60
10
20
30
5
15
25
35
100
75
85
65
95
1.00
1.50
0.50
0
2.00
0.75
1.25
0.25
1.75
PWM1-3 = 2V
OUTPUT CURRENT
EFFICIENCY
PWM
5V/DIV
I
L1A+
I
L1B
2A/DIV
I
LED
1A/DIV
2µs/DIVV
IN
= 24V
3797 TA07c
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36

LT3797IUKG#TRPBF

Mfr. #:
Buy LT3797IUKG#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
LED Lighting Drivers 3x Out LED Drvr Cntr
Lifecycle:
New from this manufacturer.
Delivery:
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