Typical operating characteristics (continued) – Rainbow Electronics MAX17127 User Manual
Page 6
6 ______________________________________________________________________________________
MAX17127
Six-String WLED Driver with Integrated
Step-Up Converter
Typical Operating Characteristics (continued)
(Circuit of Figure 1. V
IN
= 12V, T
A
= +25NC, unless otherwise noted.)
LED CURRENT vs. BRIGHTNESS SETTING
MAX17127 toc03
PWM DUTY CYCLE (%)
LED CURRENT (mA)
80
60
40
20
5
10
15
20
0
0
100
f
PWM
= 200Hz
LED CURRENT (I
LED
= 20mA AT 100% BRIGHTNESS)
vs. INPUT VOLTAGE (V
S
)
MAX17127 toc04
INPUT VOLTAGE (V)
LED CURRENT (mA)
23
20
17
14
11
8
20.05
20.10
20.15
20.20
20.00
5
26
LED CURRENT (I
LED
= 20mA AT 10% BRIGHTNESS)
vs. INPUT VOLTAGE (V
S
)
MAX17127 toc05
INPUT VOLTAGE (V)
LED CURRENT (mA)
23
20
17
14
11
8
1.98
2.00
2.02
2.04
1.96
5
26
IN QUIESCENT CURRENT
vs. IN VOLTAGE
MAX17127 toc06
IN VOLTAGE (V)
QUIESCENT CURRENT (mA)
23
20
17
14
11
7
1
2
3
4
5
6
0
5
26
100% BRIGHTNESS
200Hz/1% BRIGHTNESS
IN SHUTDOWN CURRENT
vs. IN VOLTAGE
MAX17127 toc07
IN VOLTAGE (V)
SHUTDOWN CURRENT (µA)
23
20
17
14
11
8
2
4
6
8
10
0
5
26
EN = LOW
SWITCHING WAVEFORMS
(V
S
= 5V, BRIGHTNESS = 100%)
MAX17127 toc08
1µs/div
V
LX
20V/div
0mA
500mA/div
INDUCTOR
CURRENT
0V
V
OUT
= 32V, I
OUT
= 120mA