BPW 2 Series Data Sheet, Page 1 of 5
BIAS Power Revised 01/26/2011 www.biaspower.com
Specifications subject to change
BIAS 2 Watt Power Supply
BPW 2 Series Data Sheet
Single (Vo) or Dual (Vo & Vr) output
BPW 2-08-00, -08-33, -08-50
BPW 2-14-00, -14-33, -14-50
Features
• Universal Input (90-308 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)
The BPW Power Supply Module is an ideal solution for numerous
control applications in lighting, sensing, smart building and power
distribution where operation from 277VAC mains is required. This
low-cost supply provides up to two watts of output power at 8 or 14
VDC (Vo) and an optional 3.3 or 5 VDC (Vr) output for logic functions
such as a microprocessor, logic, timing circuits, transceivers or sen-
sors. 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 additional external com-
ponents.
Operating Specifications
(@120VAC / 60 Hz / 25°C unless otherwise specified)
Electrical
Input Voltage Range
90-308 VAC (50/60Hz)
Input Surge Withstand
345V, < 30 sec
Output Power (Pmax)
2.0 W min. (60Hz)
1.67 W min. (50Hz)
Efficiency
70% nom.
Output Vo (Peak)
8 or 14 VDC nom. +/- 5%
Line / Load Regulation Vo (Peak)
+/- 1% Po < Pmax
Temperature Regulation Vo (Peak)
+/- 2% Po < Pmax
Ripple Vo (@120 Hz)
(@ 100 kHz)
1.00 V p:p
0.25 V p:p
Output Vr, 3.3 volt (+/- 5%)
For Vo = 8V, Ir out 160mA max, Io+Ir ≤ 250mA*
For Vo = 14V, Ir out 70mA max, Io+Ir ≤ 143mA*
No-load Consumption
30 mW typical @ Vin=120 VAC
Isolation
3000 VAC (meets UL / CSA &
EN Product Safety)
Earth Leakage @ 120 VAC
< 10 uA
Short Circuit Protection
Continuous, Pin ≤ 0.6 w @ Vin = 120 VAC
Reliability @ 25° C, MIL HDBK-217F
> 500 Khr MTBF
Thermal
Operating Temperature
-30 to +70° C
Operating Relative Humidity
0 – 95%, non-condensing
Storage Temperature
-40 to +105° C
Mechanical
Package Size
(L x W x H)
1.35 x 1.12 x 0.58 inches
[34.214 x 28.372 x 14.757 mm]
Safety
Safety Compliance
UL / EN 60950-1 2nd Ed. (CB Report Available)
EMI Emissions
EN 55022, Class B, FCC Part 15, Class B
Output Vr, 5.0 volt (+/- 5%)
For Vo = 8V, Ir out 250mA max, Io+Ir ≤ 250mA*
For Vo = 14V, Ir out 83mA max, Io+Ir ≤ 143mA*
Actual Size
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, sensors, transceivers 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.