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M1014

Low Consumption Voltage and Current Controller for Battery Chargers and Adaptors

STMicroelectronics 

Principles of Operation and Application Tips

TSM1014

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.

Rlimit = (Vcc – Vz) ⋅ Ivz

Figure 4: Clamp voltage

Vcc

Rlimit

Ivz

TSM1014

Vcc

Vz

28V

Figure 5: Voltage controller and over current detection schematic

Vcc

1

Vref

28V

R4

100K

3

Cc+

+

Cc-

CV

CV Out

Cv-

CC

CC Out

Gnd

R5 Vsense

10K

Rsense IL

Ric2

1K

CV

OCP

D

OUT+

To primary

R3

R6

1k

1K

5 Rvc1

22K

Cvc1

4

2.2nF

7

Cic1

Ric1

2.2nF

22K

R2

IL

+

R1

OUT-

7/10

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