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DCP021515: Why the output voltage is two times of the input voltage

Yunlong Wang85
Intellectual 290 points
Part Number: DCP021515

Hi, I am using DCP021515U in my design and the schemeatic is put below,

When the input is only 13v, why the output voltage is about 23v?

Thank you.

  • 0
    TI__Mastermind 38230 points

    DCP02 series including DCP021515 cannot be used with ACPL-P343-000E 4.0 Amp Output Current IGBT Integrated Gate Drive...

    DCP02 series cannot be used with IGBT gate driver circuitry in DC continuous mode or frequency controlled with voltages exceeding SELV limit.

     

    Isolation Voltage applications. For a device that has no specific safety agency approvals (operational isolation), the continuous voltage that can be applied across the part in normal operation is less than 42.4 VRMS, or 60 VDC. Ensure that both input and output voltages maintain normal SELV limits.

    The isolation test voltage represents a measure of immunity to transient voltages.

    WARNING does not use this device as an element of the safety Isolation system when SELV is exceeded.

    See DCP02 Isolation statement from DCP02 specification paragraph 8.3 Description Isolation attached.

     

    External continuous voltage difference limits are defined as voltages as measured between VIN (-) and Vout (-) ground). The converter is designed as ground fault isolation device. It is not designed to operate with a continuous voltage isolation barrier at greater than 60VDC. The isolation 1 second 1kv production test validates only the magnetic coating separation between primary and secondary transformer wire.

    The maximum potential difference ( Vin(+) to Vout ground ) as referenced to  a common ground is limited to continuous 60V DC or 42V Peak AC transient between Vin(-) and Output ( ground) . . The primary and secondary transformer wires will contact each other separated by magnet wire over-coating. The transformer wires are single coating material and not dual coated. The UL listing, E199929, voltage limits are SELV or 60VDC continuous or 42V transient peak.

    DCP021515 is an unregulated power converter. With 75% Load 100 Ma on Vout  bus with 15Vin vout range is 14.25V to 15.75V. Load regulation variation of 10% to100% of 2Watt load   with 15Vin (+/-1%) is 6% to 100%

    Pages from dcp02spec. Isolation statement. pdf.pdf