Kill TPS54340

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Kill TPS54340 [Copy link]

 

The price of TPS54340 has risen from 3.5 to 15 yuan. Now 431 is used as the reference and loop, 5 BJTs are used for PWM+DRV, and NMOS is promoted. The replacement cost is 1.2 yuan. The efficiency is equivalent to TPS54340 and it has successfully passed the -40~125 degree environmental test.

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Duty cycle adjustment range 0-85%

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At present, the efficiency of 28 to 12 is the same as TI, both at 93%. The next step is to add synchronization function to increase it to 96%. The same shell can meet 6A output

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The 125-degree bimetallic strip cuts off the PWM power supply, reliably realizing over-temperature protection

PowerAnts

5A cycle-by-cycle peak current protection, action threshold 200mV, a flaw in the ointment

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Xiaomi plus rifles, no longer being strangled by the US

maychang

"Replacement fee: 1.2 yuan"

This is awesome.

tagetage

I don't dare to say much in PowerAnts , but I feel that

1. The 125-degree bimetallic strip is unreliable.

2. TPS54340 has Eco-mode, but yours doesn’t.

3. There is no undervoltage lockout and soft start.

4. The volume is also much larger.

I really like TI products, but they are a bit expensive.

大秦正声

Texas Instruments now makes money mainly from analog chips, which is the National Semiconductor it acquired previously! Most MCU designs have a lot of problems!

wangerxian

Because our company couldn't buy chips, we used our own circuits to implement chip functions, but there are still some problems. However, if we modify the circuit properly, there should be no problem.

se7ens

Not bad, this is completely changed to a separate device solution

Can you send me the circuit diagram for reference?

Can we consider domestic substitution?

大秦正声

Texas Instruments is so powerful! It abandoned the 21 forum and only has the EE forum left. But now it is having a hard time and has gone to advertise at my second aunt's house!

PowerAnts

tagetage posted on 2022-3-15 20:39 I don’t dare to say much in PowerAnts, but I feel that 1. The 125-degree bimetallic strip is unreliable. 2. TPS54340 has Eco-mode, ...

Does your application frequently overheat? Is there a problem with cutting a few mA from a 2A contact capacity?
Haidilao: Because the yellow beef in the mountain area is out of stock, we use Australian beef instead! Get rid of it!
Chaozhou Peeing Beef Balls: The balls are still a little worse
Australia: Place an order, we have a feed formula

. Do you think it runs at a constant frequency? No-load 1khz narrow pulse, change to a small current reference, iq 100uA is not a big problem, just see if there is a demand

PowerAnts

se7ens published on 2022-3-16 09:38 Not bad, this is a completely changed to a discrete device solution. Can you send it out for reference? Can you consider domestic substitution?

Is there any benefit of 3 cents for sending circuit diagrams?! I send it to the boss level people to read, not to engineers to copy. Engineers with solid foundation can learn from the ideas!

PowerAnts

Of course, if you don't like me showing off, please just delete it.

soso

It's a good idea to provide an alternative. High cost performance. ：）