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What IC do you recommend for forward converter?

JohnTucker
Guru**** 191445 points
Other Parts Discussed in Thread: UC2842

Greeting for the day!!!

I am going to design the DC-DC Converter based on the Forward topology on below mentioned specifications. Kindly suggest the suitable IC and electrical schematic as well as Components BOM.

I would like to simulate this schematic on Pspice/LTspice prior to fabricate the PCB and procurement the components ,so please suggest that IC and schematic which have the Pspice model or able to simulate.

Input: 18-36VDC(Nominal 28V)

DC Output(Floating): +15V/1.5A & -15V/1.5V.

Line, Load & Temp. Regulation :1% of the output.

Ripple & Noise: Less than 50mVp-p

Topology : Forward ( or else kindly suggested)

Switching Frequency: 250kHz

Efficiency: Greater than 75%

Isolation : 200V between input & output, input & case, output & case.
Input DC Protection: Reverse Polarity, Under and Over Voltage Protection with auto recovery.
Output DC Protection :Electronic Over-Voltage Protection , Current Limiting – Continuous protection for unlimited time with auto recovery, Indefinite short circuit protection with auto recovery.
Over Temperature Protection: Shutdown at base plate temp of +105°C (±5°C) Automatic recovery at base plate temp lower than 95°C (±5°C)

EMI/RFI :Built-in Input & Output Filters as per MIL-STD-461E.
Environmental:Meets or exceeds requirement of MIL-STD-810G
Signals:

1. Inhibit: TTL "1" or open to turn ON the power supply, TTL "0" to turn OFF the power supply.

2. Sync IN : To allow the power supply frequency to sync with system frequency.

Kindly suggest the appropriate data.



Many many thank you in advance.



With Warm Regards

Atul Mishra

Hyderabad, India

  • 0
    TI__Guru* 86206 points
    Hello John,

    At the low power level you might consider using a flyback converter. The UC2842 would work in that application.
    There is a Webench design tool to help do the design. www.ti.com/.../toolssoftware.

    I would suggest that if this acceptable use the design tool to generate the design and use the UCC2809 for the controller.
    This device has a soft start pin and you can use a logic level FET to turn on and off the FET.

    The design tool is for a single output but you can just adjust your transformer to have a split secondary or two secondary windings.

    If you are worried about output ripple you could always use an LC filter on the output.

    Regards,

    Mike