Seasonic
SS-300TGW
This PSU is designed in the TFX12V
form-factor (Thin Form Factor with 12V connection), which is optimized for
computer cases 9 to 15 liters large. That's not the smallest but quite
widespread, type of compact computer case.
Compared with above mentioned PSUs, this
form factor is larger, which allow to reduce the desity of components or boost
the output power. Besides, Seasonic SS-300TGW has a 80mm fan which is more
efficient and less noisy than the high-speed 40mm buzzers.
The exterior design
Seasonic
SS-300TGW has a perfect original appearance
Seasonic SS-300TGW has a perfect original
appearance for its class. It has no unusual features like detachable cables or
additional vent holes.
A
vent grid in the PSU case that serves to exhaust the hot air
In this view we can see a vent grid in the
PSU case that serves to exhaust the hot air. Like the above-discussed models,
this one has no On/Off switch.
Circuit design
Be
designed in a rather roomy form-factor
Although this PSU is designed in a rather
roomy form-factor, we can see the same platform inside as in the
above-discussed Mini 1U products. The only exception is the cable can not be
separated. Therefore Seasonic has an efficient platform with suitable energy
parameters for compact computers and use it in the PSU of different
form-factors without much change.
The
filtering components are not close to the mains connector
Due to the roomy case, the filtering
components near the mains connector are not as close to each other as in the
previous products.
Have
a closer look at the compact platform
The thing that's important for our
particular purposes is, the larger case helped us dismantle the PSU to have a
closer look at the compact platform. We can not do that with Mini 1U products
because we can not touch a couple of attached screws.
Check
out the controller's chip
And now we can test the controller chip. It
is the half-bridge resonant LLC converter Infineon ICE2HS01G. 3PCS01 PFC
controller, which you can find nearby, is also produced by Infineon.
3PCS01
PFC controller is produced by Infineon.
Paired with a redundant Infineon ICE2QR4765
controller (the same as we can see in the SS-300M1U and SS-350M1U), we have the
same set of controls as in the ATX PSU G Gold-certified series from Seasonic.
Seasonic
SS-300TGW has Rubycon and United Chemi-Con capacitors at theoutput.
Like the junior model in the
above-discussed pair, the Seasonic SS-300TGW has Rubycon and United Chemi-Con
capacitors at the output.
A
single Teapo capacitor next to the standby source chip
But there’s also a single Teapo capacitor
next to the standby source chip.
Cable and connectors
The Seasonic SS-300TGW is equipped with the
following cables and connectors:
·
One mainboard cable with a 20+4-pin connector
(30cm)
·
One CPU cable with a 4-pin connector (40cm)
·
One cable with a PATA power connector and a
floppy-drive plug (35+15 cm)
·
One cable with a SATA power connector (30 cm)
·
One cable with two SATA power connectors (+20
cm)
Oddly enough,
this larger PSU has fewer cables and connectors than its Mini 1U counterpart
that has the same wattage rating. To be exact, the SS-300TGW lack one PATA and
one SATA power connector which appeared in the SS-300M1U.
Considering that the compact computer case
can handle more than three drives (including an optical drive), we can not
accept a reduction of the number of available power connectors.
Specification
·
Total power: 300W
·
Input frequency: 47/63
Hz
·
Output: +3.3V @ 10A, +5V
@ 14A, +12V @ 25A, -12V @ 0.3A, +5Vsb @ 2A
·
The launch, cold start:
100A maximum
·
Efficiency: >87%
·
Power Factor Correction:
Active PFC, 99% typical
·
Safety: CUL, TUV, CB
·
EMC: CE, FCC, C-tick
·
Connectors: 1x 20/24pin
Main Power connector; 1x 4pin ATX 12V connector; SATA , HDD, FDD
·
Dimensions (WxLxH):
3.3x6.9x2.5 inches / 85.0x175.0x63.5 mm
Seasonic
SS-300TGW has the same specs as the SS-300M1U has, which is not surprising
because both have the same platform and power.
It is also 80 PLUS Gold compliant.
Compatible UPS
Working together with
APC SmartUPS SC 620, this PSU is stable at loads up to 300W when powered by the
mains but could switch to the PSU's battery at loads of no more than 285W.
Cross-Load Voltage Stability
Each
of their voltage remains within 3% of the requirements.
Seasonic SS-300TGW doesn't succeed in this
test compared to the previous model with the same platform, but nonetheless
each of its voltage remains within 3% of the required levels.
Output Voltage Ripple
The
output voltage ripple is almost the same as with the SS-300M1U.
The output voltage ripple is almost the
same as with the SS-300M1U. It is only more or less strong on the +12V rail and
always remains far within the permissible limits.
Temperature and noise
Being
cooled by a 80x80x15mm ADDA AD0812MB-D90 fan
Seasonic SS-300TGW is cooled by a
80x80x15mm ADDA AD0812MB-D90 which has a rated speed at 3500 RPM.
This
model does not prevent us from measuring its fan's speed.
As opposed to the previous model, this
model does not prevent us from measuring its fan's speed.
Fan is actually idle until a load of 120W.
After that, it would turn on for brief periods of time which eventually got
longer and longer as the PSU load grew. Fan continuously operates at loads of
50% and higher. During continuous operation, the fan speed increases steadily
from 650 RPM to 1600 RPM. A 120x120x25mm fan will have unpleasant loud noise at
high speed but the low-profile 80mm fan doesn't make any noise.
The Seasonic SS-300TGW is very quiet
throughout the entire load range, being preferable to the same-wattage
SS-300M1U whose fan is downright loud at full load.
Efficiency and power factor
It
achieved 80 PLUS Gold requirements.
Seasonic SS-300M1TGW was 88.1%, 91.9% and
91.6% efficient at reference loads 20%, 50% and 100%, respectively. Therefore,
it achieved 80 PLUS Gold requirements. The peak efficiency of 92.3% was
observed at a load of 101W.
The power factor was 99.4% at full load.
Standby source
Standby
source
The standby source copes with its job
without a single problem.
