Performance/Functional Specifi cations
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted. ➀➁
Input
Input Voltage Range:
D12 Models 10-18 Volts (12V nominal)
D24 Models 18-36 Volts (24V nominal)
D48 Models 36-75 Volts (48V nominal)
Overvoltage Shutdown:
D12 Models 19-23 Volts (21V typical)
D24 Models 37-43 Volts (40V typical)
D48 Models 76.5-82 Volts (78V typical)
Start-Up Threshold:
➂
D12 Models 8.5-10 Volts (9V typical)
D24 Models 16-18 Volts (17V typical)
D48 Models 33.5-36 Volts (35V typical)
Undervoltage Shutdown:
➂
D12 Models 7.5-9 Volts (8V typical)
D24 Models 15-17 Volts (16V typical)
D48 Models 31-33.5 Volts (32V typical)
Input Current:
Normal Operating Conditions See Ordering Guide
Standby Mode (Off, OV, UV) 5mA
Input Refl ected Ripple Current 250mAp-p
Input Filter Type
D12 Models Capacitive (13.2µF)
D24 Models Pi (0.01µF-1µH-6.6µF)
D48 Models Pi (0.01µF-2.2µH-2µF)
Reverse-Polarity Protection Brief duration, 5A maximum
On/Off Control:
➃ ➄ On = open or 13V - +VIN, IIN = 1.6mA max.
Off = 0-0.8V, I
IN = 2.6mA max.
"N" Models On = 0-0.8V, I
IN = 1mA max.
Off = open or 3.3-+V
IN, IIN = 1mA max.
Output
VOUT Accuracy (50% load): ±1.0%, maximum
Minimum Loading for Specifi cation:
➁
10% of IOUT maximum
Minimum Loading for Stability:
➆
No load
Ripple/Noise (20MHz BW)
➀ ➅
See Ordering Guide
Line/Load Regulation See Ordering Guide
Effi ciency See Ordering Guide
Trim Range
➁
±5%
Isolation Voltage:
Input-to-Output 1500Vdc minimum
Output to Case 1500Vdc minimum
Isolation Capacitance 470pF
Isolation Resistance 100MΩ
Current Limit Inception (@98%V
OUT):
3.3V
OUT Models 10.5-11.5 Amps
5V
OUT Models 8.5-9.5 Amps
Short Circuit Current: (Average)
3.3V
OUT Models 3 Amps maximum
5V
OUT Models 4 Amps maximum
Overvoltage Protection: Output voltage comparator
3.3V
OUT Models 3.7-4.1 Volts
5V
OUT Models 5.6-7.1 Volts
Temperature Coeffi cient ±0.02% per °C.
Dynamic Characteristics
Dynamic Load Response:
(50-100% load step to 1% V
OUT) 200µsec maximum
Start-Up Time:
V
IN to VOUT 10ms
On/Off
to VOUT 10ms
Switching Frequency:
UWR-3.3/8-D12A 360kHz (±36kHz)
UWR-3.3/9-D24A, -D48A 300kHz (±30kHz)
UWR-5/7-D12A 360kHz (±36kHz)
UWR-5/8-D24A, -D48A 310kHz (±30kHz)
Environmental
MTBF
➅
Bellcore, ground fi xed, full power
25°C ambient
UWR-5/8-D24A 1.6 million hours
Operating Temperature
➁ -40 to +85°C, with derating
Thermal Shutdown +110°C case
Storage Temperature –40 to +120°C
Flammability UL94V-0
Physical
Dimensions See mechanical specifi cations
Case Material Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel fi nish and plastic baseplate
Pin Material RoHS: Gold plate over copper alloy
Non-RoHS: Pure tin over copper alloy
Weight: 2.7 ounces (76.5 grams)
Primary to Secondary Insulation Level Functional (D12, D24 models)
Basic (D48 models)
➀ All models are specifi ed with external 0.47µF ceramic output capacitor.
➁ See Technical Notes/Graphs for details.
➂ Applying a voltage to On/Off Control (pin 4) when no input power is applied to the converter
can cause permanent damage.
➃ Output noise may be further reduced with the addition of additional external output
capacitors. See Technical Notes. Use only as much output fi ltering as needed and no more.
Larger caps (especially low-ESR ceramic types) may slow transient response or degrade
dynamic performance.
➄ The On/Off Control is designed to be driven with open-collector logic or the application
of appropriate voltage levels. Voltages may be referenced to the –Input (pin 2).
➅ Demonstrated MTBF available on request.
www.murata-ps.com/support
UWR 26-40W Series
Single Output, High-Density, 3.3VOUT and 5 VOUT, 26-40 Watt, DC/DC Converters
MDC_UWR26-40W.D01 Page 3 of 10
