Test Results - Analog Devices EVAL-LT8376-AZ Demo Manual

TEST RESULTS

Internal PWM Dimming
V
SW
50V/DIV
PWMTG
20V/DIV
I
L
2A/DIV
I
LED
2A/DIV
128:1 PWM RATIO, 192Hz PWM FREQUENCY
Figure 3. EVAL-LT8376-AZ Internal PWM
Dimming with EMI Filters: 48V
Figure 5. EVAL-LT8376-AZ Board Thermal Image: 48V
DEMO MANUAL EVAL-LT8376-AZ
100
98
96
94
92
90
88
86
84
82
80
40 42 44 46 48 50 52 54 56 58 60
Figure 2. EVAL-LT8376-AZ Efficiency vs V
EVAL-8376 F03
10µs/DIV
, 36V , 1.5A
IN LED
Efficiency vs V
IN
f = 350kHz
SW
SSFM = ON
I = 1.5A
LED
V = 36V
LED
WITH EMI FILTERS
WITHOUT EMI FILTERS
INPUT VOLTAGE (V)
EVAL-8376 F02
IN
I
LED
500mA/DIV
V
CTRL
500mV/DIV
Figure 4. EVAL-LT8376-AZ: 50% to 100% to 50%
Load Step Transient Response, 48V
, 36V , 1.5A (SSFM ON)
IN LED
Transient Response
EVAL-8376 F04
500µs/DIV
IN
Rev. 0
5