Rainbow Electronics MAX1641 - Manual (Page 4)

MAX1640/MAX1641
Adjustable-Output, Switch-Mode
Current Source with Synchronous Rectifier
4 _______________________________________________________________________________________
0.45
0.51
0.49
0.47
0.53
0.55
0.57
0.59
0.61
0.63
0.65
4 12 8 16 20 24 28
OFF-MODE SUPPLY CURRENT
(NO-LOAD)
MAX1640/41-TOC07
INPUT VOLTAGE (V)
OFF-MODE SUPPLY CURRENT (mA)
T A = -40°C
T A = +25°C
T
A
= +85°C
10,000
1
0 50 100 150 200 250 300 350 400
SWITCHING FREQUENCY vs. R TOFF
MAX1640/41 TOC 08
T OFF (k Ω )
SWITCHING FREQUENCY (kHz)
10
100
1000
V OUT = +3V
V OUT = +6V
__________________________________________Typical Operating Characteristics
(Circuit of Figure 2, T A = +25°C, unless otherwise noted.)
40
60
50
80
70
90
100
2 6 8 10 4 12 14 16 18 20 22 24
EFFICIENCY vs. OUTPUT VOLTAGE
MAX1640/41-TOC01
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
V IN = 12V
V IN = 18V
V IN = 26V
1.460
1.470
1.480
1.490
1.500
1.510
4 12 8 16 20 24 28
MAX1640
OUTPUT CURRENT vs. INPUT VOLTAGE
MAX1640/41 TOC02
INPUT VOLTAGE (V)
OUTPUT CURRENT (A)
T A = -40°C
(V OUT = 4V)
T A = +25°C
T A = +85°C
1.450
1.470
1.460
1.490
1.480
1.500
1.510
2 6 8 10 4 12 14 16 18 20 22 24
MAX1640
OUTPUT CURRENT vs. OUTPUT VOLTAGE
MAX1640/41-TOC03
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (A)
T A = -40°C
T A = +85°C
T A = +25°C
1.450
1.475
1.500
1.525
1.550
4 12 8 16 20 24 28
MAX1641
OUTPUT CURRENT vs. INPUT VOLTAGE
MAX1640/41 TOC04
INPUT VOLTAGE (V)
OUTPUT CURRENT (A)
T A = -40°C
(V OUT = 4V)
T A = +25°C
T A = +85°C
1.420
1.460
1.440
1.500
1.480
1.540
1.520
1.560
2 6 8 10 4 12 14 16 18 20 22 24
MAX1641
OUTPUT CURRENT vs. OUTPUT VOLTAGE
MAX1640/41-TOC05
V OUT (V)
OUTPUT CURRENT (A)
T A = -40°C
T A = +25°C
T A = +85°C
1.5
1.9
1.7
2.1
2.3
2.5
2.7
2.9
4 12 8 16 20 24 28
QUIESCENT CURRENT
vs. INPUT VOLTAGE (NO-LOAD)
MAX1640/41-TOC06
INPUT VOLTAGE (V)
QUIESCENT CURRENT (mA)
T A = -40°C
T A = +25°C
T A = +85°C
A: OUTPUT CURRENT, D1 = D0 = 1 1A/div
V LOAD = 3V
B: INPUT VOLTAGE, 10V/div
LINE-TRANSIENT RESPONSE
A
B
0A
0V
2ms/div
MAX1640/41 TOC 09