TSM1013(2016) Просмотр технического описания (PDF) - STMicroelectronics

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TSM1013
(Rev.:2016)

Constant voltage and constant current controller for battery chargers and adapters

STMicroelectronics 

TSM1013

Principle of operation and application hints

6.3

Start-up and short-circuit conditions

Under start-up or short-circuit conditions the TSM1013 device is not provided with a high

enough supply voltage. This is due to the fact that the chip has its power supply line in

common with the power supply line of the system.

Therefore, the current limitation can only be ensured by the primary PWM module, which

should be chosen accordingly.

If the primary current limitation is considered not to be precise enough for the application,

then a sufficient supply for the TSM1013 has to be ensured under any condition. It would

then be necessary to add some circuitry to supply the chip with a separate power line. This

can be achieved in numerous ways, including an additional winding on the transformer.

6.4

Voltage clamp

The schematic in Figure 5 shows how to realize a low-cost power supply for the TSM1013

(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 TSM1013 supply voltage is

28 V. In the aim to protect the TSM1013 device against such high voltage values an internal

Zener clamp is integrated.

Equation 5

Rlimit = (VCC - Vz) x Ivz

Figure 5. Clamp voltage

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