Part Number: PMP8896 Other Parts Discussed in Thread: PMP9175 I want to implement the PMP8896 reference design: http://www.ti.com/tool/PMP8896 , in my own design; however, I have strict constraints on my flyback transformer height, it must be < 13 mm. Can…
Hi Sir/Madam,
In general we need to disable the internal error amplifier of the PD to enable optocoupler based feed back control. A circuit is shown below.
Some of PD's error amplifier could be disabled by tie the FB to VB. But I did not find this description…
Part Number: TPS23753A Other Parts Discussed in Thread: PMP8896 , Hello,
We are currently in the process of designing a product which utilizes the TPS23753A. For the power section we are using a design borrowed from the PMP8896 Evaluation Board. POE negotiation…
Other Parts Discussed in Thread: PMP8896 , ISO7421 What would be the tradeoff to use the ISO7421 in the PMP8896 instead of optocouplers?
Related forum post: Could TPS23753A be used with ISO7421 instead of optocouplers?
Hello Frank,
The J1 input connector is on the primary side. In the TPS23753AEVM-001, the adapter voltage is connected to the secondary side.
In order for a 12V adapter to work on the primary side, the DCDC needs to be wide-Vin. That means it can accept…
Hello Zhanpeng,
62% at 5V/300mA is low, but there are ways we can improve it.
1. The customer choose to do a diode rectified flyback. These are inherently less efficient but more cost effective. I would recommend switching to a synchronous flyback …
Part Number: TPS23753A Other Parts Discussed in Thread: PMP8896 , PMP9175
Hi
Our customer is considering PoE design using TPS23753A for camera application.
They already have been used to TPS23753A, so they chose it.
The output 4V/1.2A is required and…
Hi Amina,
I recommend rechecking the app note. We use the same process in the design of our EVMs.
To clarify:
When you specify Vflyback_min = 36V, are you getting different transformer calculations than similar to the NA6223 specs? Be certain that…
Other Parts Discussed in Thread: PMP8896 , ISO7421 I noticed that on the PMP8896 TI design, optocouplers were used instead of TI capacitive couplers like ISO7421. Is there a reason these parts were ruled out, or were they just not considered for the design…
Hello Sergey,
The TPS23758 EVM uses primary side regulation (PSR). This feature eliminates the need for a optocoupler + feedback network, but requires an additional winding on the transformer for the regulation. We have tested the Linkcomm transformer…