0.5A Step-Down Switching Regulator
TC2574
TYPICAL CHARACTERISTICS (Circuit of Figure 2 Cont.)
Figure 35. 500mA Load Transient Response for
Figure 36. 250mA Load Transient Response for
Disontinuous Mode Operation, L = 68µH, C
Continuous Mode Operation, L = 330 µH, C
= 300µF
= 470µF
OUT
OUT
50mV
AC
A
B
50 mV
AC
A
500mA
0
200 mA
B
100 mA
0
200µsec/DIV
200µsec/DIV
A: Output Pin Voltage 50V/DIV, AC Coupled
B: 100mA to 500mA Load Pu.lse
A: Output Pin Voltage 50V/DIV, AC Coupled
B: 50mA to 250mA Load Pulse
TYPICAL CHARACTERISTICS (Circuit of Figure 16 Cont.)
Figure 38. TC2574 (V
= 5.0V)
Figure 37. TC2574 (V
= 3.3V)
OUT
OUT
60
60
30
680
1000
20
15
12
470
20
15
680
10
9.0
330
8.0
7.0
470
12
220
10
330
150
6.0
9.0
220
8.0
100
150
0.4
5.0
0.1
7.0
0.15
0.2
0.3
0.4
0.5
0.1
0.15
0.2
0.3
0.5
I , MAXIMUM LOAD CURRENT (A)
I , MAXIMUM LOAD CURRENT (A)
L
L
Figure 40. TC2574–ADJ
Figure 39. TC2574 (V
OUT
= 12.0V)
60
40
250
200
150
2200
2200
1500
30
25
1500
1000
100
80
1000
680
20
680
60
50
40
470
18
17
330
470
220
30
16
15
330
150
20
15
100
68
220
0.4
14
10
0.1
0.15
0.2
0.3
0.5
0.1
0.15
0.2
0.3
0.4
0.5
I , MAXIMUM LOAD CURRENT (A)
I , MAXIMUM LOAD CURRENT (A)
L
L
23
TC2574-1 1/6/00
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
