Rainbow Electronics MAX749 - Manual (Page 3)

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 Ω
R SENSE = 0.25 Ω
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 Ω
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 = 470 Ω
R SENSE = 0.25 Ω
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 Ω
R SENSE = 0.25 Ω
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
3 5 6
-5V
-12V
-24V
-48V
R BASE = 160 Ω
R SENSE = 0.25 Ω
TRANSISTOR = ZTX750
85
65
0 10 30 50
EFFICIENCY vs. OUTPUT
CURRENT – MOSFET
70
80
MAX749TOC2-C
OUTPUT CURRENT (mA)
EFFICIENCY (%)
20 40
75
5 15 25 35 45
V+ = 5V
R
SENSE = 0.25 Ω
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
3 4 5 6 2
R BASE = 470 Ω
R SENSE = 0.25 Ω
TRANSISTOR = ZTX750
-5V
-12V
-24V
-48V
400
__________________________________________Typical Operating Characteristics
(T A = +25°C, L = 47µH, unless otherwise noted.)