MAX1640_09 Datasheet, PDF (4/12 Pages) Maxim Integrated Products – Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier

Adjustable-Output, Switch-Mode
Current Source with Synchronous Rectifier
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, T_A = +25°C, unless otherwise noted.)
EFFICIENCY vs. OUTPUT VOLTAGE
100
90
V_IN = 12V
V_IN = 18V
V_IN = 26V
80
70
60
50
MAX1640
OUTPUT CURRENT vs. INPUT VOLTAGE
1.510
1.500
(V_OUT = 4V)
T_A = -40°C
1.490
1.480
1.470
T_A = +85°C
T_A = +25°C
MAX1640
OUTPUT CURRENT vs. OUTPUT VOLTAGE
1.510
1.500
T_A = -40°C
1.490
T_A = +85°C
1.480
1.470 _{TA = +25°C}
1.460
40
2 4 6 8 10 12 14 16 18 20 22 24
OUTPUT VOLTAGE (V)
1.460
4
8 12 16 20 24 28
INPUT VOLTAGE (V)
1.450
2 4 6 8 10 12 14 16 18 20 22 24
OUTPUT VOLTAGE (V)
MAX1641
OUTPUT CURRENT vs. INPUT VOLTAGE
1.550
(V_OUT = 4V)
1.525
T_A = -40°C
1.500
T_A = +25°C
1.475
T_A = +85°C
1.450
4
8 12 16 20 24 28
INPUT VOLTAGE (V)
MAX1641
OUTPUT CURRENT vs. OUTPUT VOLTAGE
1.560
1.540
1.520
1.500
1.480
1.460
T_A = -40°C
T_A = +25°C
T_A = +85°C
1.440
1.420
2 4 6 8 10 12 14 16 18 20 22 24
V_OUT (V)
QUIESCENT CURRENT
vs. INPUT VOLTAGE (NO-LOAD)
2.9
2.7
T_A = +85°C
2.5
2.3
T_A = +25°C
2.1
T_A = -40°C
1.9
1.7
1.5
4
8 12 16 20 24 28
INPUT VOLTAGE (V)
OFF-MODE SUPPLY CURRENT
(NO-LOAD)
0.65
10,000
SWITCHING FREQUENCY vs. R_TOFF
LINE-TRANSIENT RESPONSE
0.63
0.61
0.59
T_A = +85°C
1000
V_OUT = +3V
A
0.57
0.55
T_A = +25°C
100
V_OUT = +6V
0A
0.53
T_A = -40°C
0.51
10
0.49
0.47
B
0.45
1
0V
4 8 12 16 20 24 28
0 50 100 150 200 250 300 350 400
V_LOAD = 3V
2ms/div
INPUT VOLTAGE (V)
T_OFF (kΩ)
A: OUTPUT CURRENT, D1 = D0 = 1 1A/div
B: INPUT VOLTAGE, 10V/div
4 _______________________________________________________________________________________