TC2575 Datasheet, PDF (22/25 Pages) TelCom Semiconductor, Inc – 1.0A Step-Down Switching Regulator

1.0A Step-Down Switching Regulator
TC2575
TYPICAL CHARACTERISTICS (Circuit of Figure 2)
Figure 20. Normalized Output Voltage
0.6
VIN= 20 V
0.4
ILOAD = 200mA
Normalized at
TJ = 25°C
0.2
0
–0.2
–0.4
–0.6
–50
–25
0
25
50
75 100 125
TJ, JUNCTION TEMPERATURE (°C)
Figure 21. Line Regulation
1.0
ILOAD = 200mA
0.8 ^{TJ = 25°C}
0.6
3.3 V, 5.0 V and Adj
0.4
0.2
0
12V
–0.2
0
5.0 10 15 20 25 30 35 40
VIN INPUT VOLTAGE (V)
Figure 22 Switch Saturation Voltage
1.2
1.1
1.0
0.9
–40°C
0.8
0.7
25°C
0.6
125°C
0.5
0.4
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
SWITCH CURRENT (A)
Figure 24. Dropout Voltage
2.0
1.8
ILOAD = 1.0A
1.6
∆VOUT _{= 5%}
RIND _{= 0.2Ω}
1.4
1.2
1.0 _{ILOAD = 200mA}
0.8
0.6
0.4
–50 –5
0
25
50
75 100 125
TJ, JUNCTION TEMPERATURE (°C)
Figure 23. Current Limit
3.0
2.5
2.0
1.5
1.0
0.5
0
–50
VIN = 25V
–25
0
25
50
75
100 125
TJ, JUNCTION TEMPERATURE (°C)
Figure 25. Quiescent Current
20
VOUT _{= 5.0V}
18
Measured at
Ground Pin
16
TJ = 25°C
14
ILOAD _{= 1.0A}
12
10
8.0
ILOAD = 200mA
6.0
4.0
0 5.0 10 15 20 25 30 35 40
VIN INPUT VOLTAGE (V)
TC2575-1 3/13/00
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