Rainbow-electronics MAX749 Manual de usuario Pagina 3

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MAX749
Digitally Adjustable LCD Bias Supply
_______________________________________________________________________________________
3
85
65
-24 -20 -12 -4
EFFICIENCY vs.
OUTPUT VOLTAGE
70
80
MAX749-TOC1-A
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
-16 -8
75
-40mA
V+ = 3V
R
BASE
= 470
R
SENSE
= 0.25Ω
TRANSISTOR : ZTX750
-22 -18 -14 -10 -6
-20mA
-5mA
85
65
-24 -20 -12 -4
EFFICIENCY vs.
OUTPUT VOLTAGE
70
80
MAX749-TOC1-B
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
-16 -8
75
-5mA
-20mA
-40mA
V+ = 5V
R
SENSE
= 0.25
TRANSISTOR : SMD10P05L
-22 -18 -14 -10 -6
80
65
0
EFFICIENCY vs. OUTPUT
CURRENT – PNP
MAX749TOC2-A
OUTPUT CURRENT (mA)
EFFICIENCY (%)
70
75
10 20 30 40 50
85
60
-24V
-12V
-5V
V+ = 3V
R
BASE
= 470Ω
R
SENSE
= 0.25
TRANSISTOR: ZTX750
80
64
0 20 60 100
EFFICIENCY vs. OUTPUT
CURRENT – PNP
68
76
MAX749TOC2-B
OUTPUT CURRENT (mA)
EFFICIENCY (%)
40 80
72
78
74
70
66
10 30 50 70 90
V+ = 3V
R
BASE
= 160
R
SENSE
= 0.25
TRANSISTOR = ZTX750
-12V
-5V
-24V
0
2
LOAD CURRENT vs. INPUT VOLTAGE
MAX749-TOC3-B
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
4
50
100
150
200
250
300
350
400
450
500
35
6
-5V
-12V
-24V
-48V
R
BASE
= 160
R
SENSE
= 0.25Ω
TRANSISTOR = ZTX750
85
65
010 30 50
EFFICIENCY vs. OUTPUT
CURRENT – MOSFET
70
80
MAX749TOC2-C
OUTPUT CURRENT (mA)
EFFICIENCY (%)
20 40
75
5 15253545
V+ = 5V
R
SENSE
= 0.25Ω
TRANSISTOR: SMD10P05L
-12V
-5V
-24V
0
LOAD CURRENT vs. INPUT VOLTAGE
MAX749-TOC3-A
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
50
100
150
200
250
300
350
345
6
2
R
BASE
= 470Ω
R
SENSE
= 0.25Ω
TRANSISTOR = ZTX750
-5V
-12V
-24V
-48V
400
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, L = 47µH, unless otherwise noted.)
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