TSM1052 Просмотр технического описания (PDF) - STMicroelectronics

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TSM1052

Constant voltage and constant current controller for battery chargers and adapters

STMicroelectronics 

Application information

Figure 16. Output voltage versus output current

Vout

Voltage regulation

Current regulation

TSM1052

(Vcc of the device independent of output voltage)

Iout

4.3

Compensation

The voltage control transconductance operational amplifier can be fully compensated. Both

of its output and negative input are directly accessible for external compensation

components.

An example of a suitable compensation network is shown in Figure 15. It consists of a

capacitor CVC1 = 2.2nF and a resistor RCV1 = 470KΩ in series.

The current-control transconductance operational amplifier can be fully compensated. Both

its output and negative input are directly accessible for external compensation components.

An example of a suitable compensation network is shown in Figure 15. It consists of a

capacitor CIC1 = 2.2nF and a resistor RIC1 = 22KΩ in series. In order to increase the stability

of the application it is suggested to add a resistor in series with the optocoupler. An example

of a suitable RLED value could be 330Ω in series with the optocoupler.

4.4

Start up and short circuit conditions

Under start-up or short-circuit conditions if the device is supplied from SMPS output and the

output voltage is lower than Vcc minimum the current regulation is not guaranteed.

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 device 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.

The following schematic shows how to realize a low-cost power supply for the device (with

no additional windings).

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