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DEMO MANUAL EVAL-LT8355-1-AZ
BOARD PHOTO
PERFORMANCE SUMMARY
PARAMETER
Input Voltage PVIN Range
Switching Frequency (f
, 100% to 125% SSFM) R40 = 86.6k
SW
I
LED
Open LED Protection (LED+ to LED–)
Peak Efficiency (SSFM ON)
Peak Switch Current Limit
Internally-Generated PWM Dimming Range
Internally-Generated PWM Dimming Frequency
PV
Undervoltage Lockout (UVLO) Falling
IN
PV
Enable Turn-On (EN) Rising
IN
2
Figure 1. EVAL-LT8355-1-AZ Demo Board
Specifications are at T
CONDITION
Operating
8V < PVIN < 18V, CTRL1, CTRL2, ADJ2 Turrets = Float
CH1: RS2 = 0.56Ω, V
≤ 72V
LED
CH2: RS4 = 0.25Ω, V
≤ 30V
LED
CH1: R14 = 0, R11 = 1M, R10 = 15k
CH2: R52 = 287k, R53 = 10k, R47 = 10k
PVIN = 12V, CH1: V
= 72V, I
LED
LED
with Filters
without Filters
CH1: RS1 = 0.013Ω
CH2: RS3 = 0.012Ω
0.5V < V
< 1.5V
PWM
R40 = 86.6k
R33 = 499k, R34 = 127k
eval-lt8355-1-az
F01
= 25°C
A
= 450mA, CH2: V
= 30V, I
= 1A
LED
LED
MIN
TYP
MAX
UNITS
8
18
V
250
312
kHz
450
mA
1
A
81
V
36
V
90
%
91
%
7.7
A
8.3
A
1/128
100
%
250
Hz
6.2
V
7.5
V
Rev. 0
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