TSM1011ID(2016) 데이터 시트보기 (PDF) - STMicroelectronics

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TSM1011ID
(Rev.:2016)

Constant Voltage and Constant Current Controller for Battery Chargers and Adapters

STMicroelectronics 

Start-up and short-circuit conditions

8

Start-up and short-circuit conditions

TSM1011

Under start-up or short-circuit conditions the TSM1011 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 not considered to be precise enough for the application,

then a sufficient supply for the TSM1011 has to be ensured under all conditions. This means

that it is 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.

9

Voltage clamp

The schematic in Figure 10 shows how to realize a low-cost power supply for the TSM1011

(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 TSM1011 supply voltage is 28 V. In the aim to

protect the TSM1011 against such high voltage values an internal Zener clamp is integrated

(see Figure 6).

Equation 5

Rlimit = Ivz  VCC – Vz

Figure 6. Clamp voltage

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DocID9310 Rev 2

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