Techcode®
2A 150KHz PWM Buck DC/DC Converter
DATASHEET
TD1509
Vout
3.3V
5V
9V
12V
Figure 12. Typical Application of TD1509 For ADJ
Note:In PCB layout. Reserved an area for CFF
R1
1.6K
3.6K
6.8K
1.5K
R2
2.7K
11K
43K
13K
Cf (Operational)
33nf
10nf
1.5nf
1nf
Table 3. Vout VS. R1, R2, Cf Select Table
Output
Voltage
3.3V
5V
9V
12V
Input
Voltage
6V ~ 18V
6V ~36V
8V ~ 18V
8V ~36V
12V ~18V
12V ~36V
15V ~ 18V
15V ~36V
Inductor (L1)
47uh
68uh
33uh
47uh
47uh
47uh
47uh
47uh
Output Capacitor (Cout)
Through Hole Electrolytic
470uf/25V
560uf/25V
330uf/25V
470uf/25V
330uf/25V
470uf/25V
220uf/25V
330uf/25V
Table 4. Typical Application Buck Regulator Design Procedure
December, 20, 2005.
Techcode Semiconductor Limited
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