agile switching power supply

Hello Reinhard,

I apologize for the late response, this application falls in sort of a grey area of support.

+60V at 600mA is 36 Watts. This would be relatively easy to create a moduled output.
However, the -6V negative would require a 4 Quadrant converter.
   Current direction and voltage polarity are both reversed from the positive output.

A 4 quadrant converter is required because you must be able to source and sink current in both directions while also having plus and minus voltage polarities.

For your power level you may consider the UCC3750 Source-Ringer Controller.

The UCC3750 Source-Ringer Controller provides a complete control and drive solution for a four quadrant flyback-based ring generator circuit. The IC controls a primary-side switch, which is modulated when power transfer is taking place from input to output. It also controls two secondary switches, which act as synchronous rectifier switches during positive power flow. These switches are pulse-width-modulated when the power is being delivered back to the source. Ring-signal generation can be addressed from a power-conversion viewpoint with a switching amplifier or a DC-AC inverter. This application note describes a unique flyback-derived four-quadrant power inverter with a complete design procedure and control solution. While the ring-generator solution is emphasized, it is clear that this approach is suitable for many other low-power inverter applications, such as UPS systems and audio amplifiers.

U-169 A Complete Control Solution for a Four-Quadrant Flyback Converter

The UCC3750 has a clock to create the low ring frequencies, but you can bypass that.
The ring clock feeds the error amplifier circuit via SINFLT signal.
You can provide your own signal into this node, Figure 8 below, to drive the output to +60 or -6V at the desired slew rate and period.

Also see this Unitrode Seminar paper on the IC: Seminar 1200 Topic 5 - Unique Four-Quadrant Flyback Converter

TI doesn't have any examples of doing exactly what you want, however it is within the realm of this IC.

You could create your own Test Power Supply, perhaps with this design, but I suggest looking for an off the shelf packaged supply made for LIN testing.

Your comments are welcome.

Hello Reinhard,

Unfortunately the EVM is no longer available.
The EVM schematic is shown in the UCC3750 datasheet page 6.
Attached is a PDF showing a bill of materials.
UCC3750 EVM slua103.pdf

That waveform is 20 Hz triangle centered on ground.
20 Hz sin is one of the ringer frequencies selectable.
The IC oscillator will create a 20Hz sin wave, fairly clean.

There may be an op amp circuit to convert the sin to a triangle.
However there is another possibility.

    SWRLY: Logic output that leads the battery offset
    crossings (by typically 5ms) to allow “zero voltage” relay
    switching. This pin can typically source 250μA.

This is a pulse that happens on the 20Hz zero crossings.
This could be used to make your own triangle reference.

A 20 Hz triangle reference should work fine to create the triangle output.
You would need to calculate voltage feedback dividers to give the voltage you want.
And this circuit is based on 40V input, you want 24V.
This will affect the transformer turns ratio.

The topology is flyback, very common.
Have you designed a Flyback before?