Principles of Operation and Application Tips

TSM1014

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5.5 Voltage clamp

The following schematic shows how to realize a low-cost power supply for the TSM1014 (with no

additional windings).Please pay attention to the fact that in the particular case presented here, this low-

cost power supply can reach voltages as high as twice the voltage of the regulated line. Since the

Absolute Maximum Rating of the TSM1014 supply voltage is 28V. In the aim to protect he TSM1014

against such how voltage values a internal zener clamp is integrated.

Figure 4: Clamp voltage

Figure 5: Voltage controller and over current detection schematic

R

limit

V

cc

V

z

–

() I

vz

⋅

=

Vz

28V

Vcc

Rlimit

Vcc

Ivz

TSM1014

D

R2

R1

Rsense

Rvc1

22K

Cvc1

2.2nF

Ric1

22K

CV

To primary

OUT+

OUT-

+

Cic1

2.2nF

IL

Ric2

1K

R5

10K

R4

100K

R3

1k

IL

Vsense

+

OCP

R6

1K

28V

Vcc

Cv-

CV Out

Gnd

Cc-

Cc+

Vref

1

4

5

3

7

CV

CC

CC Out