Load Slammer

https://loadslammer.com/product/ls1000/

Looks silly to me. It's apparently not polarity protected. They
recommend soldering it to the board under test. Looks like it's
designed to break at $1800 per pass.

I'm about to test some switchers on a new board, for noise and
transient dynamics, but I don't need this.

 

[Tim Williams]

Would be a little useful with a lowish jitter trigger and adjustable pulse
width or pulse pattern. Do some ChipWhisperer stuff -- supply glitching.

But considering the ChipWhisperer is open, and a lot cheaper, yeah...

Tim

--
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Design
Website: https://www.seventransistorlabs.com/

<jlarkin@highlandsniptechnology.com> wrote in message
news:68p7neh7hte5psh1gteejj27ci8l6nhia5@4ax.com...

https://loadslammer.com/product/ls1000/

Looks silly to me. It's apparently not polarity protected. They
recommend soldering it to the board under test. Looks like it's
designed to break at $1800 per pass.

I'm about to test some switchers on a new board, for noise and
transient dynamics, but I don't need this.

 

[Winfield Hill]

jlarkin@highlandsniptechnology.com wrote...

https://loadslammer.com/product/ls1000/

Looks silly to me. It's apparently not polarity protected.
They recommend soldering it to the board under test. Looks
like it's designed to break at $1800 per pass.

I'm about to test some switchers on a new board, for noise
and transient dynamics, but I don't need this.

Reminding you about our programmable current-source design
and performance in AoE x-Chapters, section 4x.26, updated:

https://www.dropbox.com/s/o4g4mhzl70rsi9t/4x.26_MOSFET_CS_nodal-analysis_final.pdf?dl=1

We show a 2.5A max version, with 25ns response time, but
with bigger MOSFETs you can easily make them for 20A, 50A
or whatever. The MOSFETs in higher-current versions will
have higher C1 (Ciss) and hence need lower R3 values, or
C2 R2 setup for slower (50ns, 100ns) response, or maintain
25ns speed with a BUF634 gate-drive buffer and R3=6.8, etc.

Low cost. Use with a programmable waveform generator, to
fully characterize your power-supply's transient response.

There's a PCB to help build and test prototype designs.

https://www.dropbox.com/s/r4q0atrj4qv4o6q/RIS-792_v2.pdf?dl=1


--
Thanks,
- Win

 

On 7 Sep 2019 13:09:24 -0700, Winfield Hill <winfieldhill@yahoo.com>
wrote:

jlarkin@highlandsniptechnology.com wrote...

https://loadslammer.com/product/ls1000/

Looks silly to me. It's apparently not polarity protected.
They recommend soldering it to the board under test. Looks
like it's designed to break at $1800 per pass.

I'm about to test some switchers on a new board, for noise
and transient dynamics, but I don't need this.

Reminding you about our programmable current-source design
and performance in AoE x-Chapters, section 4x.26, updated:

https://www.dropbox.com/s/o4g4mhzl70rsi9t/4x.26_MOSFET_CS_nodal-analysis_final.pdf?dl=1

We show a 2.5A max version, with 25ns response time, but
with bigger MOSFETs you can easily make them for 20A, 50A
or whatever. The MOSFETs in higher-current versions will
have higher C1 (Ciss) and hence need lower R3 values, or
C2 R2 setup for slower (50ns, 100ns) response, or maintain
25ns speed with a BUF634 gate-drive buffer and R3=6.8, etc.

Low cost. Use with a programmable waveform generator, to
fully characterize your power-supply's transient response.

There's a PCB to help build and test prototype designs.

https://www.dropbox.com/s/r4q0atrj4qv4o6q/RIS-792_v2.pdf?dl=1

For modest-current switchers, I can just connect a 50 ohm square wave
generator to the switcher output and see the basic transient response.
I also inherited a couple of Kikusui power supply load boxes, which
can dissipate hundreds of watts and can do square-wave load
modulation.

But just a power mosfet and a few load resistors would work.

The new board that I'm getting on Monday uses a few TPS54302
switchers. I've never got WebBench to run, and don't care to learn
Tina, so I guessed the compensation and will verify it experimentally.

You can also just inject a tiny square wave into a switcher feedback
pin, when it's driving its normal load, and see what the loop does.

 

On Sat, 07 Sep 2019 14:23:07 -0700, jlarkin@highlandsniptechnology.com
wrote:

On 7 Sep 2019 13:09:24 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

jlarkin@highlandsniptechnology.com wrote...

https://loadslammer.com/product/ls1000/

Looks silly to me. It's apparently not polarity protected.
They recommend soldering it to the board under test. Looks
like it's designed to break at $1800 per pass.

I'm about to test some switchers on a new board, for noise
and transient dynamics, but I don't need this.

Reminding you about our programmable current-source design
and performance in AoE x-Chapters, section 4x.26, updated:

https://www.dropbox.com/s/o4g4mhzl70rsi9t/4x.26_MOSFET_CS_nodal-analysis_final.pdf?dl=1

We show a 2.5A max version, with 25ns response time, but
with bigger MOSFETs you can easily make them for 20A, 50A
or whatever. The MOSFETs in higher-current versions will
have higher C1 (Ciss) and hence need lower R3 values, or
C2 R2 setup for slower (50ns, 100ns) response, or maintain
25ns speed with a BUF634 gate-drive buffer and R3=6.8, etc.

Low cost. Use with a programmable waveform generator, to
fully characterize your power-supply's transient response.

There's a PCB to help build and test prototype designs.

https://www.dropbox.com/s/r4q0atrj4qv4o6q/RIS-792_v2.pdf?dl=1

For modest-current switchers, I can just connect a 50 ohm square wave
generator to the switcher output and see the basic transient response.
I also inherited a couple of Kikusui power supply load boxes, which
can dissipate hundreds of watts and can do square-wave load
modulation.

I have a B&K 8601 and an 8610.

But just a power mosfet and a few load resistors would work.

The new board that I'm getting on Monday uses a few TPS54302
switchers. I've never got WebBench to run, and don't care to learn
Tina, so I guessed the compensation and will verify it experimentally.

You can also just inject a tiny square wave into a switcher feedback
pin, when it's driving its normal load, and see what the loop does.

Or use a VNA, or something designed for the purpose.
<https://www.venableinstruments.com/products/frequency-response-analyzers/6300-series>
I add a 50ohm resistor to the upper feedback resistor, with test
points, to make connection painless.

 

[Winfield Hill]

jlarkin@highlandsniptechnology.com wrote...

The new board that I'm getting on Monday uses a
few TPS54302 switchers.

I designed the TPS54302 into my RIS-788 bee-hive
monitor board, but was shocked not to be able to
purchase enough for the first production run. So
I had to change to TPS54202H. The H was a special
'54202 version that hadn't been wiped out of stock.


--
Thanks,
- Win

 

On Sat, 07 Sep 2019 22:44:00 -0400, krw@notreal.com wrote:

On Sat, 07 Sep 2019 14:23:07 -0700, jlarkin@highlandsniptechnology.com
wrote:

On 7 Sep 2019 13:09:24 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:

jlarkin@highlandsniptechnology.com wrote...

https://loadslammer.com/product/ls1000/

Looks silly to me. It's apparently not polarity protected.
They recommend soldering it to the board under test. Looks
like it's designed to break at $1800 per pass.

I'm about to test some switchers on a new board, for noise
and transient dynamics, but I don't need this.

Reminding you about our programmable current-source design
and performance in AoE x-Chapters, section 4x.26, updated:

https://www.dropbox.com/s/o4g4mhzl70rsi9t/4x.26_MOSFET_CS_nodal-analysis_final.pdf?dl=1

We show a 2.5A max version, with 25ns response time, but
with bigger MOSFETs you can easily make them for 20A, 50A
or whatever. The MOSFETs in higher-current versions will
have higher C1 (Ciss) and hence need lower R3 values, or
C2 R2 setup for slower (50ns, 100ns) response, or maintain
25ns speed with a BUF634 gate-drive buffer and R3=6.8, etc.

Low cost. Use with a programmable waveform generator, to
fully characterize your power-supply's transient response.

There's a PCB to help build and test prototype designs.

https://www.dropbox.com/s/r4q0atrj4qv4o6q/RIS-792_v2.pdf?dl=1

For modest-current switchers, I can just connect a 50 ohm square wave
generator to the switcher output and see the basic transient response.
I also inherited a couple of Kikusui power supply load boxes, which
can dissipate hundreds of watts and can do square-wave load
modulation.

I have a B&K 8601 and an 8610.

But just a power mosfet and a few load resistors would work.

The new board that I'm getting on Monday uses a few TPS54302
switchers. I've never got WebBench to run, and don't care to learn
Tina, so I guessed the compensation and will verify it experimentally.

You can also just inject a tiny square wave into a switcher feedback
pin, when it's driving its normal load, and see what the loop does.

Or use a VNA, or something designed for the purpose.
https://www.venableinstruments.com/products/frequency-response-analyzers/6300-series
I add a 50ohm resistor to the upper feedback resistor, with test
points, to make connection painless.

Step response tells me all I need to know, and just needs a function
or pulse generator, and a scope. The scope checks for noise on the
power rail, and startup behavior, too.

I only have one knob to turn on the TPS54302, the value of one
capacitor.

https://www.dropbox.com/s/pwinhe0zdipykg8/TPS54302.jpg?raw=1

 

On 7 Sep 2019 19:32:50 -0700, Winfield Hill <winfieldhill@yahoo.com>
wrote:

jlarkin@highlandsniptechnology.com wrote...

The new board that I'm getting on Monday uses a
few TPS54302 switchers.

I designed the TPS54302 into my RIS-788 bee-hive
monitor board, but was shocked not to be able to
purchase enough for the first production run. So
I had to change to TPS54202H. The H was a special
'54202 version that hadn't been wiped out of stock.

There seems to be lots of 54302's around now. Great little part.