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LT3756 Datasheet(PDF) 26 Page - Analog Devices

Part # LT3756
Description  60VIN/120VOUT Dual LED Controller with Exponential PWM and Scalable Dimming
PDF  31 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT3756 Datasheet(HTML) 26 Page - Analog Devices

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LT8355-1
26
Rev. A
For more information www.analog.com
TYPICAL APPLICATIONS
Complete Automotive Headlamp Solution
Efficiency vs VIN Voltage
500:1 External PWM Dimming at 100Hz
Cold Crank LED Regulation
Boost Channel LED Current vs VIADJ2
0.68nF
0.68nF
51.1k
147k
499k
10µF
15k
33k
D1
10µF
190m
M3
L1
15µH
255k
Q1
10k
12.5m
ILIM = 8A
2.2µF
M1
D2
500m
M4
2.2µF
L2
22µH
20m
ILIM = 5A
M2
10k
549k
10µF
100k
VIN
8V TO 36V
(DOWN TO 6V
TEMPORARILY)
EN/UVLO
VC2
VC1
VREF
CTRL1
CTRL2
IADJ2
INTVCC
f = 400kHz
LT8355-1
DRL/POSITION
LIGHTS
GATE1
1.3A
FB1
ISP1
ISN1
PWMTG1
SENSEP1
SENSEN1
RT
GND
32W
LED
ARRAY
VIN
VIN
0.5A
FB2
ISP2
ISN2
PWMTG2
30W
LED
ARRAY
FAULT1
GATE2
SENSEP2
SENSEN2
PWM1
PWM2
HIGH/LOW BEAMS
VIN
100V
100V
100V
L1: WURTH 74435571500
L2: WURTH 74435572200
M1: VISHAY Si7852DP
M2: VISHAY Si7812DN
M3: VISHAY Si7113DN
M4: VISHAY Si7117DN
D1: DIODES INC SBR12U120P5
D2: DIODES INC PDS5100H
8355-1 TA04a
50V
LED CURRENT
GAIN DIMMING
FAULT2
100k
BUCK-BOOST
BOOST
BOTH CHANNELS
VIN (V)
6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36
60
65
70
75
80
85
90
95
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
83551 TA04b
VIN = 6V
VIN = 8V
1s/DIV
VIN
VOLTAGE
2V/DIV
BUCK-BOOST
LED CURRENT
500mA/DIV
BOOST LED
CURRENT
250mA/DIV
8355-1 TA04c
VIN = 14V, INFINITE PERSISTANCE
10µs/DIV
PWM1 PIN
VOLTAGE
3V/DIV
PWM2 PIN
VOLTAGE
3V/DIV
BUCK-BOOST
LED CURRENT
1A/DIV
BOOST
LED CURRENT
500mA/DIV
8355-1 TA04d
VCTRL2 = 2V
VCTRL2 = 1V
VIADJ2 (V)
0 0.25 0.50 0.75 1 1.25 1.50 1.75 2
0
125
250
375
500
625
8355-1 TA04e



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