Q67100-H8646 Просмотр технического описания (PDF) - Infineon Technologies

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Q67100-H8646

General-Purpose Power Controller (GPPC)

Infineon Technologies 

PSB 2121

Extended Input Voltage Range

Some DC/DC-converter applications require a higher input voltage than the maximum supply

voltage of the PSB 2121 which is limited to 70 V. Figure 4 shows a method to extend the input

voltage range by connecting a zener-diode between the input voltage and VS of the PSB 2121.

Figure 4

If the PSB 2121 is fed via VEXT, the input current at pin VS is approx. 30 µA. The additional power

losses are accordingly 30 µA × VZ; the minimum input voltage is VZ + 8 V.

PSB 2121 Applications

The PSB 2121 accommodates both galvanically isolated and non-isolated configurations.

Figure 5 shows a non-isolated 1 W flyback converter. The converter is fully compatible with the

CCITT-power recommendations on the S-interface. At an input voltage of 40 V, the efficiency is

64 % at an input power of 250 mW and 86 % at an input power of 900 mW.

Figure 6 shows a 4 W flyback converter with opto isolation to feed the S-bus with 40 V. The

maximum input voltage is extended from 70 V to 100 V.

Semiconductor Group

11

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