DWR-5/2.65-3.3/3-D24-C Murata Power Solutions Inc, DWR-5/2.65-3.3/3-D24-C Datasheet - Page 4

• Manufacturer Part Number: DWR-5/2.65-3.3/3-D24-C
• Description: DC/DC Converters & Regulators 5Vout 2.65A 24Vin 3.3Vout 3A 24Vin
• Manufacturer: Murata Power Solutions Inc
• Series: DWRr

Specifications of DWR-5/2.65-3.3/3-D24-C

• Output Power: 13 W
• Input Voltage Range: 18 V to 36 V
• Input Voltage (nominal): 24 V
• Number Of Outputs: 2
• Output Voltage (channel 1): 5 V
• Output Current (channel 1): 2.65 A
• Output Voltage (channel 2): 3.3 V
• Output Current (channel 2): 3 A
• Isolation Voltage: 1.5 KV
• Product: Isolated
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TECHNICAL NOTES
Isolation / Case Connection
The XWR Series’ 5V and 3.3V outputs (pins 5 & 8) with its common return (pin
7) are isolated from the +V
and an opto-coupled transistor.
The DC/DC converter’s case is internally connected to pin 4. This allows
circuit specifi c grounding of the case on either the input or the output side, or
leaving the case disconnected, i.e. “fl oating.”
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of a sustained, non-current-limited, input-voltage polar-
ity reversal exists. For XWR 15 Watt Series Converters, it is recommended to
install slow blow fuses with values no greater than the following, in the +Input
line.
Input Reverse-Polarity Protection
Upon applying a reverse-polarity voltage to the DC/DC converter, an internal
diode will be forward biased, drawing excessive current from the power
source. Therefore, it is required that the input current be limited by either an
appropriately rated input fuse or a current limited power source.
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
Input Voltage:
Input Reverse-Polarity Protection: ➁
Output Current ➁
On/Off Control (Pin 3) Max. Voltages:
Storage Temperature
Lead Temperature (Soldering, 10 sec.)
These are stress ratings. Exposure of devices to greater than any of these conditions may
adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Specifi cations Table is not implied, nor recommended.
Continuous:
Transient (100msec): D12 Models
D12 Models
D24 Models
D48 Models
Referenced to –Input (pin 2)
D12 Models
D24 Models
D48 Models
V
IN
Range
Fuse Value
D12 Models
D24 Models
D48 Models
D24 Models
D48 Models
Absolute Maximum Ratings
3 Amps
2 Amps
1 Amps
IN
and –V
IN
inputs (pins 1 & 2) via a transformer
21 Volts
40 Volts
81 Volts
25 Volts
50 Volts
100 Volts
Input Current must be limited. 1 minute
duration. Fusing recommended.
3 Amps
2 Amps
1 Amps
Current limited. Devices can withstand
an indefi nite output short circuit.
+15V
–40 to +120°C
+300°C
www.murata-ps.com
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.
Input voltages exceeding the input overvoltage shutdown specifi cation listed
in the Performance/Functional Specifi cations will cause the device to shut-
down. 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 suffi ciently reduced.
Start-Up Time
The V
crosses the turn-on threshold point, and the fully loaded output voltage enters
and remains within its specifi ed accuracy band. Actual measured times will
vary with input source impedance, external input/output capacitance, and
the slew rate of the input voltages. The XWR 15 Watt Series implements a
soft start circuit that limits the duty cycle of the PWM controller at power up,
thereby limiting the Input Inrush current.
The On/Off Control to V
nominal input voltage applied but is turned off via the On/Off Control pin. The
specifi cation defi nes the interval between the time at which the converter is
turned on and the fully loaded output voltage enters and remains within its
specifi ed accuracy band. Similar to the V
to V
external load capacitance.
On/Off Control
The On/Off Control (pin 3) 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 XWR Series is designed so that it is enabled
when the control pin is left open (pulled high) and disabled when the control
pin is pulled low (less than +0.8V relative to –Input).
Dynamic control of the on/off function is best accomplished with a mechani-
cal relay or an open-collector/open-drain circuit (optically isolated if appropri-
ate). The drive circuit should be able to sink approximately 1 mA for logic low.
The on/off control function is designed such that the converter can be
disabled while the input power is ramping up, and then “released” once the
input has stabilized.
Dual Output, 3.3V and 5V, 15Watt DC/DC Converters
OUT
IN
start-up time is also governed by the internal soft start circuitry and
to V
OUT
start-up time is the interval of time where the input voltage
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3
2
Figure 2. Internal On/Off Control circuitry
OUT
ON/OFF
CONTROL
–INPUT
start-up time assumes the converter has its
DSM/DWR Models
MDC_DSM/DWR Models.B01 Page 4 of 9
IN
to V
OUT
start-up, the On/Off Control
13V CIRCUIT
5V CIRCUIT
+Vcc
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