Some EPROM programming voltage is above 12.5V, how to achieve
T56 as040471as Posted on 2022-6-18 11:39 [/ quote]
As an user.... As you may know, most common power supplies are what is called down converters. First they are feed from grid , usually 110/220v AC voltage, to
generate , let say 5V DC voltage, like most phone adapters, or multiple DC voltages
like the power supply from a TV set. In This they first convert AC to DC, near 320v DC
from a 220V AC , and then they convert the 320v DC to any other or multiple DC voltages that's
needed. In this cases, the last part are indeed a down converter from 320v DC to 5v DC (phone
adapter).
In the case of T56, using a 5V DC voltage, from usb line or/and DC jack, it have inside some special
circuits that allow, controlled by software, do two things, work as a down converter, if the voltages
needed are below 5v, or as up converter if the voltages are above 5v. Inside the T56 are a few of
those converters. They also may act as a security measure, for loads from ICs that you try to program,
as you may know, they can get faulty, and draw much more current they they used when they are in
good working order.
The reason, i think , it's better to use only the usb voltage to power supply the T56, is to avoid
noise (disturbances in the conversion of voltages) that can affect the work. The quality of power
supplies from USB and or from DC are critical to achieve success , as you know, latest's ICs use
low power, like 1.8v, and achieve high speed, and any noise present may difficult or turn impossible
the programing of those ICs.
Keep always in mind this job , may seem easy to do, but is indeed critical, and you play an important
role, starting the install of software, setting the correct target ICs, understand the difference from
many ICs that you may buy from market, different manufacturers or batches, or the worst, remarked
ones to look like originals, and requesting for help, as ADMIN do a very nice job here, time allow.
