1.0A Step-Down Switching Regulator
TC2575
Feedback
7.0 – 40V
Unregulated
DC Input
+VIN
CIN
100µF
4
TC2575
3 GND
Output
2
5 ON/OFF
L1
330µH
5.0V Regulated
Output 1.0A Load
D1
1N5819
COUT
330µF
+
1
Figure 1. Block Diagram and Typical Application: Fixed Output Voltages
5.0 Output Voltage Versions
Feedback
VIN
1
VIN
Unregulated
DC Input
8.0 – 40V
+
CIN
100µF/50V
3
TC2575
(5V)
GND
5
4
Output
2
ON/OFF
L1
330µH
COUT +
D1
330µF/16V
IN5819
VOUT
Regulated
Output
Load
Adjustable Output Voltage Versions
Feedback
VIN
1
Unregulated
DC Input
8.0 – 40V
+
3
4
TC2575
Adjustable
GND
5
Output
2
ON/OFF
D1
IN5819
L1
330µH
VOUT
Regulated
Output
+ CIN
330µF/
16V
R2
Load
R1
CIN
100µF/50V
VOUT = VREF
R2
(
1 + R1
)
R1= R2
(
VOUT - 1
)
VREF
Where VREF = 1.23V, R1
between 1.0kΩ and 5.0kΩ
Figure 2. Typical Test Circuit
TC2575-1 3/13/00
5
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
