BIAS 2 Watt Power Supply
BPS 2 Series Data Sheet
Single (Vo) or Dual (Vo & Vr) output
BPS 2-08-00, -08-33, -08-50
BPS 2-14-00, -14-33, -14-50
BPS 2-24-00
The BPS Power Supply Module is an ideal solution for numerous con-
trol applications in lighting, sensing, smart building/home and power
distribution. This low-cost supply provides up to two watts of output
power at 8, 14 or 24VDC (Vo) and an optional 3.3 or 5 VDC (Vr) out-
put for logic functions such as a microprocessor, logic, timing circuits,
transceivers or sensors. A patented design incorporating a custom
integrated circuit into a small package (0.87 in
3
[14.3 cm
3
]) the BIAS
Module provides an immediate “drop-in” solution, requiring no addi-
tional external components.
Actual Size
Features
•
•
•
•
•
•
•
•
Universal Input (85-265 VAC, 50/60Hz)
Small Size—0.87in
3
[14.3cm
3
]
Low no-load input power <30mW
Constant power mode, not current limit
3000 VAC Isolation
Up to 75% efficiency
EN 55022, Class B; FCC Part 15, Class B
Meets UL/CSA and EN Product Safety (ITE)
Operating Specifications
(@120VAC / 60 Hz / 25°C unless otherwise specified)
Bias Power AC/DC power supplies are designed to be
applied in two major categories of applications…
Auxiliary,
where the Bias supply is one of two or more sup-
plies and provides power for standby, housekeeping, bias-
ing or other requirements. Generally, these supply 3.3V or
5.0V requirements from the Vr output. In some cases a
small amount of Vo power is used.
Second
is as a main or utility supply where Bias is the only
supply and provides all power necessary for the product or
system. Both Vr and Vo supplies are often utilized for opti-
mum system performance.
The characteristics of the Vo and Vr outputs are different
and each has application-specific benefits which can pro-
vide high value to the system designer.
Vo is a voltage-regulated output which has a constant
power mode instead of a conventional current limit. This
output is best suited to drive mechanical relays, solenoids,
SSRs, capacitive loads, indicating lights, LEDs and as a
source for isolated DC utility power which may be used
directly or post-regulated with either a linear regulator or a
DC/DC converter. Vo is self protecting, cannot be over-
loaded and can be shorted indefinitely. The graceful transi-
tion from voltage regulation to constant power along with
the wide range of product ratings, allows the designer to
select a supply tightly matched to the design load. There is
no need to oversize a Bias Power supply. Unlike design-
your-own, or partially complete modules where significant
design margin is required, to stay far away from current
limit, Bias’s constant power alternative requires no such
over-spec’ing.
Vr is also a voltage-regulated output and is thermally pro-
tected from overload. It has very low output ripple capable
of driving microprocessors , logic, transceivers, sensors and
other elements which require a low-noise, tightly-regulated
supply. In addition, Vr is supplied internally by Vo. This
means that any capacitance added to Vo can increase the
hold-up time of Vr as well.
*Note: maximum currents specified for constant voltage
range only. See V-I curve on page 2 for Vo in constant
power range.
Electrical
Input Voltage Range
Input Surge Withstand
Output Power (Pmax)
Efficiency
Output Vo (Peak)
Line / Load Regulation Vo (Peak)
Temperature Regulation Vo (Peak)
Ripple Vo (@120 Hz)
(@ 100 kHz)
Output Vr, 3.3 volt (+/- 5%)
Output Vr, 5.0 volt (+/- 5%)
No-load Consumption
Isolation
Earth Leakage @ 120 VAC
Short Circuit Protection
Reliability @ 25° C, MIL HDBK-217F
Thermal
Operating Temperature
Operating Relative Humidity
Storage Temperature
Mechanical
Package Size
(L x W x H)
Safety
Safety Compliance
EMI Emissions
UL / EN 60950-1 2nd Ed. (CB Report Available)
EN 55022, Class B, FCC Part 15, Class B
1.35 x 1.12 x 0.58 inches
[34.214 x 28.372 x 14.757 mm]
-30 to +70° C
0 – 95%, non-condensing
-40 to +105° C
85 - 265 VAC (50/60Hz)
308V, < 30 sec
2.0 W min. (60Hz)
1.67 W min. (50Hz)
70% nom.
8, 14 or 24 VDC nom. +/- 5%
+/- 1% Po < Pmax
+/- 2% Po < Pmax
1.00 V p:p
0.25 V p:p
For Vo = 8V, Ir out 160mA max, Io+Ir ≤ 250mA*
For Vo = 14V, Ir out 70mA max, Io+Ir ≤ 143mA*
For Vo = 8V, Ir out 250mA max, Io+Ir ≤ 250mA*
For Vo = 14V, Ir out 83mA max, Io+Ir ≤ 143mA*
30 mW typical @ Vin=120 VAC
3000 VAC (meets UL / CSA & EN Product Safety)
< 10 uA
Continuous, Pin ≤ 0.6 w @ Vin = 120 VAC
> 500 Khr MTBF
BIAS Power
BPS 2 Series Data Sheet, Page
1 of 5
Revised 01/26/2011
Specifications subject to change
www.biaspower.com
DIY/Open Source Hardware
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