BIAS Power Supply Module
BPW 4 Series Data Sheet
Single (Vo) or Dual (Vo & Vr) output
BPW 4-08-00, -08-33, -08-50
BPW 4-14-00, -14-33, -14-50
BPW 4-24-00
Features
The BPW 4 Power Supply Module is an ideal solution for numer-
ous control applications in lighting, sensing, smart building and
power distribution where operation from 277VAC mains is re-
quired. This low-cost supply provides up to four watts of output
power at 8, 14 and 24 VDC (Vo) and optional 3.3 and 5.0 VDC (Vr)
output for microprocessors, logic, timing circuits, transceivers,
sensors or other control functions. Incorporating a custom inte-
grated circuit into a small package (2.45 in3 [40.1 cm3]) the BIAS
Module provides an immediate “drop-in” solution, requiring no
additional external components.
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Universal Input (85-308 VAC, 50/60Hz)
Small Size—2.45 in3 [40.1 cm3]
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)
Bias Power AC/DC power supplies are designed to be
applied in two major categories of applications…
Operating Specifications
(@120VAC / 60 Hz / 25ºC unless otherwise specified)
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.
Electrical
Input Voltage Range
85 - 308 VAC (50/60Hz)
345V, < 30 sec
Input Surge Withstand
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.
4 W min. (60Hz)
3.33 W min. (50Hz)
Output Power (Pmax)
Efficiency
≥ 70%
Output Vo (Peak)
8, 14 or 24 VDC nom. +/- 5%
+/- 1% Po < Pmax
+/- 2% Po < Pmax
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.
Line / Load Regulation Vo (Peak)
Temperature Regulation Vo (Peak)
Ripple Vo (@120 Hz)
(@ 100 kHz)
1.75 V p:p
0.25 V p:p
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.
For Vo = 8V, Ir out 160mA max, Io+Ir ≤ 500mA
For Vo = 14V, Ir out 70mA max, Io+Ir ≤ 285mA
For Vo = 24V, Vr not available
Output Vr, 3.3 volt (+/- 5%)
Output Vr, 5.0 volt (+/- 5%)
For Vo = 8V, Ir out 250mA max, Io+Ir ≤ 500mA
For Vo = 14V, Ir out 83mA max, Io+Ir ≤ 285mA
For Vo = 24V, Vr not available
No-load Consumption
Isolation
30 mW typical @ Vin=120 VAC
3000 VAC (meets UL / CSA & EN Product Safety)
Earth Leakage @ 120 VAC
Short Circuit Protection
< 10 uA
Continuous, Pin ≤ 0.7 w @ Vin = 120 VAC
> 500 Khr MTBF
Reliability @ 25° C, MIL HDBK-217F
Thermal
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.
Operating Temperature
-30 to +70o C
Operating Relative Humidity
0 – 95%, non-condensing
-40 to +105o C
Storage Temperature
Mechanical
Package Size (L x W x H)
1.91 x 1.31 x 0.98 inches [48.5 x 33.3 x 24.9 mm]
Safety
*Note: maximum currents specified for constant voltage
range only. See V-I curve on page 2 for Vo in constant
power range.
Safety Compliance
UL / EN 60950-1 2nd Ed. (CB Report Available)
EN 55022, Class B, FCC Part 15, Class B
EMI Emissions
BPW 4 Series Data Sheet, Page 1 of 3
Revised 08/22/2011
BIAS Power
www.biaspower.com
Specifications subject to change
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