Analog Devices EVAL-LT8355-1-AZ, Руководство пользователя

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