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LT3797 Datasheet(PDF) 34 Page - Linear Technology

Part # LT3797
Description  Triple Output LED Driver Controller
PDF  36 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3797 Datasheet(HTML) 34 Page - Linear Technology

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LT3797
34
3797f
For more information www.linear.com/LT3797
TYPICAL APPLICATIONS
Triple SEPIC LED Driver
1000:1 PWM Dimming at 120Hz
Efficiency and Output Current vs VIN
OVLO
CTRL1-3
VREF
RT
SYNC
SW1
BOOST
INTVCC GND
VC1-3
FBH1-3
SW2
RT
35.7k
400kHz
0.1µF
LPWR
47µH
PWM1-3
FLT1-3
SS1-3
CIN1-3
4.7µF
×3
CIN4
1µF
0.1µF
10µF
3797 TA07
10nF
2k
562k
24.9k
47.5k
0.015
M1
L1A
49.9k
487k
75k
VIN
2.5V TO 40V
(60V TRANSIENT,
41V INTERNAL
OVLO PROTECTION)
ISP1-3
EN/UVLO
D1-D3: ON SEMICONDUCTOR MBRS3100
L1-L3: WÜRTH ELEKTRONIK 748870220
LPWR: COILTRONICS SD25-470
M1, M3, M5: INFINEON BSC160N10NS3G
M2, M4, M6: VISHAY SILICONIX Si4401BDY
VIN
VIN
ISN1-3
GATE1 TG1
SENSEP1
SENSEN1
D1
LT3797
M2
L1B
COUT1
4.7µF
×2
COUT2
4.7µF
×2
COUT3
4.7µF
×2
CDC1
4.7µF
50V
CDC2
4.7µF
50V
CDC3
4.7µF
50V
•
0.25
0.015
M3
L2A
GATE2 TG2
SENSEP2
SENSEN2
D2
M4
L2B
•
0.015
M5
L3A
GATE1 TG1
SENSEP1
SENSEN1
D3
1A
24V
M6
ISN3
1A
24V
0.1µF
1A
24V
ISP3
L3B
•
0.25
ISN2
ISP2
0.25
ISN1
ISP1
0.1µF
0.1µF
VIN (V)
0
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
IL1A+IL1B
2A/DIV
ILED
1A/DIV
2µs/DIV
VIN = 24V
3797 TA07c



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