Design specifications and schematic diagram

AN2454

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Design specifications and schematic diagram

Table 1 lists the converter specifications and main parameters of the STEVAL-IPB001V1

demo board.

A schematic diagram of the SMPS is given in Figure 1 The most relevant components are:

●

HV ESBT main switch and simple driving circuit (see Section 6: Base driving circuit

design).

●

Active start-up circuit with HV bipolar Darlington (see Section 7: Active start-up circuit) .

●

A specially constructed transformer, with very low parasitic capacitance.

Table 1.

Converter specifications and main parameters of the STEVAL-IPB001V1

demo board

Symbol

Description

Values

Rectified minimum input voltage

150

Rectified maximum input voltage

1200

Output voltage

24V/83mA

Maximum output power

2W

Minimum output power

0.2W

η

Converter efficiency

60%

F

Switching frequency

Reflected flyback voltage

150V

Max over voltage limited by clamping circuit

150V