Rainbow-electronics MAX8596Z Uživatelský manuál Strana 4

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MAX8595Z/MAX8596Z
High-Efficiency, 32V Step-Up Converters
with T
A
Derating Option for 2 to 8 White LEDs
4 _______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 1, V
IN
= 3.6V, I
LED
= 25mA, L = 22µH, C
IN
= 2.2µF, C
OUT
= 0.1µF, C
COMP
= 0.1µF, R
SENSE
= 13, 4 LEDs,
T
A
= +25°C, unless otherwise noted.)
EFFICIENCY
vs. INPUT VOLTAGE
MAX8595Z toc01
INPUT VOLTAGE (V)
EFFICIENCY (%)
543
55
60
65
70
75
80
85
90
95
100
50
26
3 LEDs
4 LEDs
6 LEDs
8 LEDs
EFFICIENCY
vs. LED CURRENT
MAX8595Z toc02
LED CURRENT (mA)
EFFICIENCY (%)
252015105
65
70
75
80
85
90
60
030
3 LEDs
6 LEDs
8 LEDs
LED CURRENT
vs. DIRECT-PWM DIMMING
MAX8595Z toc03
DUTY CYCLE (%)
LED CURRENT (mA)
80604020
5
10
15
20
25
30
0
0 100
LED CURRENT
vs. AMBIENT TEMPERATURE
MAX8595Z toc04
TEMPERATURE (°C)
LED CURRENT (mA)
806020 400-20
10
12
14
16
18
20
22
24
26
8
-40 100
MAX8596,
I
LED
= 25mA AT T
A
= +25°C
MAX8595,
I
LED
= 15mA
SWITCHING WAVEFORMS
MAX8595Z toc05
500ns/div
V
IN
20mV/div
AC-COUPLED
200mV/div
AC-COUPLED
100mA/div
10V/div
V
LX
V
OUT
I
L
SOFT-START AND SHUTDOWN RESPONSE
MAX8595Z toc06
20ms/div
V
CTRL
2V/div
0
0
0
0
40mA/div
10V/div
100mA/div
I
IN
I
LED
V
OUT
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