Typical operating characteristics – Rainbow Electronics MAX686 User Manual
Page 5
MAX686
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
_______________________________________________________________________________________
5
95
60
0.1
1
10
100
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= +24V)
70
65
75
80
85
90
MAX686 TOC01
LOAD CURRENT (mA)
EFFICIENCY (%)
A: V
IN
= 12V, ISET = V
CC
B: V
IN
= 12V, ISET = GND
C: V
IN
= 5V, ISET = V
CC
D: V
IN
= 5V, ISET = GND
E: V
IN
= 3V, ISET = GND
F: V
IN
= 3V, ISET = V
CC
C
D
E
F
A
B
95
90
60
0.1
10
1
1000
100
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= +12V)
65
MAX686 TOC02
LOAD CURRENT (mA)
EFFICIENCY (%)
70
75
80
85
A: V
IN
= 9V, ISET = V
CC
B: V
IN
= 9V, ISET = GND
C: V
IN
= 5V, ISET = V
CC
D: V
IN
= 5V, ISET = GND
E: V
IN
= 3V, ISET = GND
F: V
IN
= 3V, ISET = V
CC
D
C
F
B
A
E
85
60
0.1
1
10
100
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= -12V)
65
70
75
80
MAX686 TOC03
LOAD CURRENT (mA)
EFFICIENCY (%)
A
F
E
B
D
C: V
IN
= 5V, ISET = GND
D: V
IN =
5V, ISET = V
CC
E: V
IN =
3V, ISET = GND
F: V
IN
= 3V, ISET = V
CC
A: V
IN
= 9V, ISET = GND
B: V
IN
= 9V, ISET = V
CC
C
__________________________________________Typical Operating Characteristics
(Circuits of Figures 1 and 2, V
CC
= V
DD
= V
IN
= +5V, L1 = 22µH, SHDN = V
CC
, C
REF
= 0.1µF, TA = +25°C, unless otherwise noted.)
85
50
0.1
1
10
100
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= -18V)
60
55
65
70
75
80
MAX686 TOC04
LOAD CURRENT (mA)
EFFICIENCY (%)
C
D
A: V
IN
= 9V, ISET = GND
B: V
IN
= 9V, ISET = V
CC
C: V
IN
= 5V, ISET = GND
D: V
IN
= 5V, ISET = V
CC
E: V
IN
= 3V, ISET = GND
F: V
IN
= 3V, ISET = V
CC
E
F
A
B
1000
1
0
4
6
2
10
12
8
14
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE (V
OUT
= +12V, +24V)
10
100
MAX686 TOC05
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
A: V
OUT
= 12V, ISET = V
CC
B: V
OUT
= 12V, ISET = GND
C: V
OUT
= 24V, ISET = V
CC
D: V
OUT
= 24V, ISET = GND
A
C
D
B
1
10
100
0
4
6
8
2
10
12
14
16
18
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE (V
OUT
= -12V, -18V)
MAX686 TOC06
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
B
D
C
A: V
OUT
= -12V, ISET = V
CC
B: V
OUT
= -18V, ISET = V
CC
C: V
OUT
= -12V, ISET = GND
D: V
OUT
= -18V, ISET = GND
A
B & D
A & C
V
OUT
50mV/div
AC-COUPLED
V
OUT
50mV/div
AC-COUPLED
ISET = V
CC
ISET
= GND
OUTPUT VOLTAGE RIPPLE
MAX686 TOC09
20
µ
s/div
V
OUT
= 24V
I
LOAD
= 5mA
1000
1
0
2
1
4
5
3
6
INPUT CURRENT
vs. INPUT VOLTAGE
10
100
MAX686 TOC07
INPUT VOLTAGE (V)
INPUT CURRENT (
µ
A)
V
CC
= V
IN
= V
DD
INPUT CURRENT = I
CC
+ I
DD
V
OUT
= 18V, NO LOAD
1.244
1.246
1.245
1.248
1.247
1.251
1.250
1.249
1.252
0
40
20
60
80
100
120
140
REFERENCE VOLTAGE
vs. LOAD CURRENT
MAX686
TOC08
LOAD CURRENT (
µ
A)
REFERENCE VOLTAGE (V)
V
IN
= V
CC
= 5V
C
REF
= 0.1
µ
F