Test Results - Analog Devices EVAL-LT8356-1-AZ Demo Manual

TEST RESULTS

Internal PWM Dimming
V
SW
50A/DIV
PWMTG
50V/DIV
I
L
5A/DIV
I
LED
1A/DIV
Figure 4. EVAL-LT8356-1-AZ as Buck-Boost Mode LED Driver
Internal 260Hz 2% PWM Dimming with EMI Filters and
SSFM ON: 12V , 36V , 1A
IN LED
DEMO MANUAL EVAL-LT8356-1-AZ
100
95
90
85
80
75
70
65
WITH EMI FILTERS
WITHOUT EMI FILTERS
60
8 12
Figure 3. EVAL-LT8356-1-AZ as Buck-Boost Mode LED
Driver Efficiency vs Input Voltage
EVAL-83561 F04
20µs/DIV
ILED
500mA/DIV
V
CTRL
500mV/DIV
Figure 6. EVAL-LT8356-1-AZ as Buck-Boost Mode LED Driver:
50% to 100% to 50% Load Step Transient Response, 12V
Efficiency vs V
IN
= 250kHz
f
SW
SSFM = ON
I = 1A
LED
V = 36V
LED
16 20 24 28 32 36
INPUT VOLTAGE (V)
EVAL-83561 F03
I
LED
1A/DIV
Figure 5. EVAL-LT8356-1-AZ as Buck-Boost Mode LED Driver
External 150Hz PWM Dimming with EMI Filters and SSFM ON:
12V , 36V , 1A
IN LED
Transient Response
f = 250kHz
SW
SSFM = ON
EVAL-83561 F06
500µs/DIV
External PWM Dimming
500:1
2,000:1
1,000:1
5,000:1
EVAL-83561 F05
2µs/DIV
IN
Rev. A
5