MAX1985EVKIT Maxim Integrated Products, MAX1985EVKIT Datasheet - Page 7

• Manufacturer Part Number: MAX1985EVKIT
• Description: Power Management Modules & Development Tools MAX1985 EVAL KIT MAX1985 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX1985EVKIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(Circuit of Figure 1; V
100
90
80
70
60
50
40
C
D
A
B
2.5
TOTAL EFFICIENCY vs. INPUT VOLTAGE
A: BITA VOLTAGE, 5V/div
B: OUT VOLTAGE, 2V/div
C: INDUCTOR CURRENT, 100mA/div
D: LD_ CURRENT, 20mA/div
3.0
STARTUP WAVEFORMS
(4mA LED CURRENT )
INPUT VOLTAGE (V)
3.5
8 LEDs
6 LEDs
4 LEDs
100µs/div
_______________________________________________________________________________________
IN
4.0
= 3.3V, SETI = IN, MODE = IN, T
4.5
MAX1984/85/86 toc13
5.0
5.5
5V
0
4V
2V
0
100mA
0
20mA
0
26.0
25.5
25.0
24.5
24.0
Typical Operating Characteristics (continued)
25
20
15
10
5
0
2.5
0
LED CURRENT vs. INPUT VOLTAGE
LED CURRENT vs. DPWM DUTY
A
3.0
Ultra-High-Efficiency White
ACTUAL
= +25°C, unless otherwise noted.)
20
THEORETICAL
INPUT VOLTAGE (V)
3.5
DPWM DUTY (%)
40
50kHz DPWM FREQUENCY
4.0
60
4.5
R
R
SETI
SETI
80
= 278kΩ
= 278kΩ
5.0
100
5.5
26
25
24
23
22
30
25
20
15
10
0
0
ACTUAL
LED Drivers
50
LED CURRENT MATCHING
MAXIMUM LED CURRENT
500
vs. SETI RESISTANCE
SETI RESISTANCE (kΩ)
THEORETICAL
100
LD_VOLTAGE (mV)
LD1 TO LD8
1000
150
200
R
1500
SETI
= 278kΩ
250
2000
300
7