BWR-5/6-3.3/7-D48-C Murata Power Solutions Inc, BWR-5/6-3.3/7-D48-C Datasheet - Page 4

• Manufacturer Part Number: BWR-5/6-3.3/7-D48-C
• Description: DC/DC Converter
• Manufacturer: Murata Power Solutions Inc
• Series: BWRr

Specifications of BWR-5/6-3.3/7-D48-C

• Dc / Dc Converter O/p Type: Fixed
• No. Of Outputs: 2
• Input Voltage: 36V To 75V
• Power Rating: 33W
• Output Voltage: 5V
• Output Current: 6A
• Output Voltage 2: 3.3V
• Output Current 2: 7A
• Approval Bodies: CE, EN, UL
• Product: Isolated
• Output Power: 30 W
• Input Voltage Range: 36 V to 75 V
• Input Voltage (nominal): 48 V
• Number Of Outputs: 2
• Output Voltage (channel 1): 5 V
• Output Current (channel 1): 6 A
• Output Voltage (channel 2): 3.3 V
• Output Current (channel 2): 7 A
• Isolation Voltage: 1.5 KV
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5V & 3.3V Regulation
The BWR 33 Watt Series converters are designed such that both the 5V and
3.3V outputs share a common regulation feedback control loop. Though the
feedback loop is influenced by both outputs, the 3.3 Volt output is dominant. As
a result, the 3.3 Volt regulation (1%) is superior to the 5 Volt regulation (1.5%).
and for no-load to 100% loading. Operation below 10% of full load mandates
an increase in the regulation tolerance of ±0.5% for 3.3 Volt output and an
increase of ±1% for the 5 Volt output. A slight increase in switching noise may
also be observed for operation below 10% loading.
output is the most demanding for +5V regulation. Under such conditions
the internal "bleeder" circuit is activated to provide an internal load thereby
keeping regulation within the published specifications. The bleeder is activated
gradually so as not to cause any erratic behavior on the converters outputs. A
slight degradation in efficiency will occur while this internal load is activated.
Filtering and Noise Reduction
The BWR 33 Watt Series Converters achieve their rated ripple and noise
specifications with the use of 1μF output capacitors. In critical applications,
input/output noise may be further reduced by installing additional external I/O
capacitors. Input capacitors should be selected for bulk capacitance, low ESR
and high rms-ripple-current ratings. Output capacitors should be selected for
low ESR and appropriate frequency response. All caps should have appropriate
voltage ratings and be located as close to the converter as possible.
Start-Up Time
The V
crosses the turn-on threshold point, and the fully loaded output voltage enters
The converters are specified for load regulation of 10% to 100% loading
Operation with a full load on 3.3 Volt output and light to no load on 5 Volt
TECHNICAL NOTES
Input Voltage
Input Reverse-Polarity Protection
Output Current
On/Off Control (Pin 4) Max. Voltages
Storage Temperature
Lead Temperature (Soldering, 10 sec.)
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifications Table is not implied, nor recommended.
IN
Continuous:
Transient (100msec): "D12" Models
"D12" Models
"D24" Models
"D48" Models
Referenced to –Input (pin 2)
to V
OUT
start-up time is the interval of time where the input voltage
"D12" Models
"D24" Models
"D48" Models
"D24" Models
"D48" Models
Absolute Maximum Ratings
23 Volts
42 Volts
81 Volts
25 Volts
50 Volts
100 Volts
Input Current must be limited. 1 minute
duration. Fusing recommended.
6 Amps
4 Amps
2 Amps
Current limited. Devices can withstand
an indefinite output short circuit.
+V
–40 to +120°C
+300°C
IN
www.murata-ps.com
and remains within its specified accuracy band. Actual measured times will
vary with input source impedance, external input/output capacitance, and
the slew rate of the input voltages. The BWR-5/6-3.3/7 Series implements a
soft start circuit that limits the duty cycle of the PWM controller at power up,
thereby limiting the Input Inrush current.
nominal input voltage applied but is turned off via the On/Off Control pin. The
specification defines the interval between the time at which the converter is
turned on and the fully loaded output voltage enters and remains within its
specified accuracy band. Similar to the V
to V
external load capacitance.
Input Overvoltage/Undervoltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate until the
ramping-up input voltage exceeds the Start-Up Threshold Voltage (35V for
"D48" models). Once operating, devices will not turn off until the input voltage
drops below the Undervoltage Shutdown limit (34V for "D48" models). Subse-
quent re-start will not occur until the input is brought back up to the Start-Up
Threshold. This built in hysteresis prevents any unstable on/off situations from
occurring at a single input voltage.
listed in the Performance/Functional Specifications will cause the device to
shutdown. A built-in hysteresis of 0.6 to 1.6 Volts for all models will not allow
the converter to restart until the input voltage is sufficiently reduced.
On/Off Control
The On/Off Control (pin 4) may be used for remote on/off operation. As shown
in Figure 1, the control pin is referenced to the –Input (pin 2) and will be inter-
nally pulled to a high state. The standard BWR model (no suffix) is designed
so that it is enabled when the control pin is left open and disabled when the
control pin is pulled low (less than +0.8V relative to –Input).
cal relay or an open-collector/open-drain circuit (optically isolated if appropriate).
The drive circuit should be able to sink approximately 1 mA for logic low.
disabled while the input power is ramping up, and then "released" once the
input has stabilized.
The On/Off Control to V
Input voltages exceeding the input overvoltage shutdown specification
Dynamic control of the on/off function is best accomplished with a mechani-
The on/off control function is designed such that the converter can be
OUT
start-up time is also governed by the internal soft start circuitry and
Dual Output BWR Models
Figure 1. Internal Circuitry for On/Off Control
1
4
2
Technical enquiries email: [e-mail], tel:
+INPUT
ON/OFF
CONTROL
–INPUT
OUT
Mixed Voltage, 5V
start-up time assumes the converter has its
R
R
B
A
MMDC_BWR 33W Models.A02
IN
33 Watt DC/DC Converters
D12 R
D24 R
D48 R
to V
OUT
A
A
A
= 34.8k , R
= 100k , R
= 100k , R
start-up, the On/Off Control
AND
B
B
B
3.3V, 2” x 2”
= 6.83k
= 9.74k
= 4.53k
[phone]
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