0.5A Step-Down Switching Regulator
TC2574
TYPICAL CHARACTERISTICS (Circuit of Figure 2)
Figure 23. Normalized Output Voltage
Figure 24. Line Regulation
1.0
1.4
1.2
1.0
0.8
0.6
0.4
V
I
= 20V
0.8
0.6
0.4
0.2
IN
I
T
= 100mA
LOAD
= 25°C
= 100mA
LOAD
J
Normalized at T = 25°C
J
3.3V , 5.0V and ADJ
0
–0.2
–0.4
–0.6
–0.8
–1.0
0.2
0
12V
–0.2
–0.4
–0.6
–50
–25
0
25
60
75
100
125
0
5.0
10
15
20
25
30
35
40
V
, INPUT VOLTAGE (V)
T
JUNCTION TEMPERATURE (°C)
IN
J
Figure 25. Dropout Voltage
Figure 26. Current Limit
2.0
1.5
1.0
1.4
1.3
1.2
1.1
1.0
L = 300µH
V
= 25 V
IN
I
= 500mA
= 100mA
LOAD
I
Load
0.9
0.8
0.7
0.5
0
–50
–5
0
25
60
75
100
125
–50
–25
0
25
60
75
100
125
T
JUNCTION TEMPERATURE (°C)
T
JUNCTION TEMPERATURE (°C)
J
J
Figure 27. Quiescent Current
Figure 28. Standby Quiescent Current
20
18
200
V
= 5.0 V
V
= 5.0 V
180
160
140
120
100
OUT
ON/OFF
Measured at
Ground Pin
16
T
= 25°C
J
14
I
= 500mA
V
= 40 V
= 12 V
60
12
LOAD
IN
80
60
10
I
= 100mA
LOAD
8.0
6.0
4.0
V
IN
40
20
0
0
5.0
10
15
20
25
30
35
40
–50
–25
0
25
75
100
125
V
IN INPUT VOLTAGE (V)
T JUNCTION TEMPERATURE (°C)
J
21
TC2574-1 1/6/00
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
