MAX17127 Maxim Integrated Products, MAX17127 Datasheet - Page 8

• Manufacturer Part Number: MAX17127
• Description: Six-String WLED Driver
• Manufacturer: Maxim Integrated Products

(Circuit of Figure 1. V
Six-String WLED Driver with Integrated
Step-Up Converter
8
______________________________________________________________________________________
(BRIGHTNESS = 100%, 3 LEDs SHORT ON FB1)
(V
S
20mA
= 21V
21V
LED-SHORT FAULT PROTECTION
LINE-TRANSIENT RESPONSE
IN
= 12V, T
9V, BRIGHTNESS = 100%)
200µs/div
10µs/div
A
= +25NC, unless otherwise noted.)
MAX17127 toc17
MAX17127 toc15
9V
MAXIMUM UNBALANCE RATE BETWEEN STRINGS
0.8
0.7
0.6
0.5
0.4
0.3
0.2
Typical Operating Characteristics (continued)
5
(I
0V
V
(AC-COUPLED)
1V/div
V
10V/div
0V
0A
INDUCTOR
CURRENT
1A/div
I
10mA/div
0mA
V
10V/div
0V
I
50mA/div
0mA
FB1
FB1
UNBALANCE RATE (%)
OUT
S
LED
FB1
8
= 20mA) vs. INPUT VOLTAGE (V
MAXIMUM
11
INPUT VOLTAGE (V)
14
=
I
FB_
17
−
I
FB(AVG)
I
FB(AVG) MAX
20
MAXIMUM UNBALANCE RATE BETWEEN STRING
1.0
0.8
0.6
0.4
0.2
0
vs. BRIGHTNESS (V
10
(V
23
UNBALANCE RATE (%)
S
20mA
= 9V
20
%
9V
S
LINE-TRANSIENT RESPONSE
26
)
30
MAXIMUM
21V, BRIGHTNESS = 100%)
40
BRIGHTNESS (%)
200µs/div
50
=
S
= 12V, I
I
FB_
60
−
I
70
FB(AVG)
I
FB(AVG) MAX
LED
80
MAX17127 toc16
21V
= 20mA)
90
%
100
V
(AC-COUPLED)
2V/div
0V
V
10V/div
0V
0A
INDUCTOR
CURRENT
1A/div
I
10mA/div
0mA
FB1
OUT
S
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