Dynamic Characteristics (continued)
Switching Frequency
1.2V models 250-300kHz ±30kHz, model dependent
1.5V D48 models 260kHz (±30kHz)
1.8V D12 models 280kHz (±30kHz)
1.8V D24 models 250kHz (±30kHz)
1.8V D48 models 210kHz (±20kHz)
2.5 and 1.5 D12/D24 models 340kHz (±40kHz)
3.3-12V models 310-345kHz ±10%, model dependent
Environmental
Operating Temperature (Ambient):
–40 to +85°C with Derating
(See Derating Curves)
Case Temperature:
Maximum Allowable +100°C
Storage Temperature –40 to +105°C
Physical
Dimensions 2" x 1" x 0.475" (51 x 25 x 12.1mm)
Shielding None
Case Material Diallyl phthalate, UL94V-0 rated
Pin Material Gold-plated copper alloy with nickel underplate
Weight 1.4 ounces (39.7 grams)
➀ All models are specifi ed with two external 0.47µF multi-layer ceramic capacitors installed across
their output pins.
➁ See Minimum Output Loading Requirements under Technical Notes.
➂ See Technical Notes for details.
➃ The On/Off Control and Trim functions are optional and must be installed by MPS. See Optional
Functions or contact MPS for details.
➄ The On/Off Control is designed to be driven with open-collector logic or the application of appro-
priate voltages (referenced to –Input, pin 2). Applying a voltage to the On/Off Control pin when
no input voltage is applied to the converter may cause permanent damage. See Technical Notes.
➅ Output noise maybe further reduced with the addition of additional external output capacitors.
See Technical Notes.
➆ Operating temperature range without derating is model and input-voltage dependent. See
Temperature Derating.
➇ RoHS-6 hazardous substance compliance does not claim EU RoHS exemption 7b (lead in solder).
Performance/Functional Specifi cations
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted. ➀➁
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.
Input Voltage:
Continuous:
D12 Models 22 Volts
D24 Models 44 Volts
D48 Models 88 Volts
Transient (100msec):
D12 Models 50 Volts
D24 Models 50 Volts
D48 Models 100 Volts
Input Reverse-Polarity Protection Current must be <10 Amps. Brief duration
only. Fusing recommended.
Output Overvoltage Protection:
1.2V/1.5/1.8V Outputs 2.1/2.2/2.3 Volts, unlimited duration
2.5V/3.3V Outputs TBD/3.4/4.4 Volts, unlimited duration
5V/12V/15V Outputs 7.1/16/18 Volts, unlimited duration
Output Current Current limited. Devices can withstand sus-
tained output short circuits without damage.
Case Temperature +100°C
Storage Temperature –40 to +105°C
Lead Temperature See soldering guidelines
Absolute Maximum Ratings
Input
Input Voltage Range:
D12A Models 10-18 Volts (12V nominal)
D24A Models 18-36 Volts (24V nominal)
D48A Models 36-75 Volts (48V nominal)
Overvoltage Shutdown:
D12A Models 18.5-21 Volts (20V typical)
D24A Models 37-41 Volts (38V typical)
D48A Models 77-81 Volts (78.5V typical)
Start-Up Threshold:
➂
D12A Models 9.4-10 Volts (9.6V typical)
D24A Models 16.5-18 Volts (17V typical)
D48A Models 34-36 Volts (35V typical)
Undervoltage Shutdown:
➂
D12A Models 7-8.5 Volts (8V typical)
D24A Models 15.5-17.5 Volts (16.5V typical)
D48A Models 32.5-35.5 Volts (34V typical)
Input Current:
Normal Operating Conditions See Ordering Guide
Standby Mode (Off, OV, UV) 5mA
Input Filter Type Pi
Reverse-Polarity Protection Brief duration, 10A maximum
On/Off Control (Optional, Pin 3):
➃ ➄
D12AC, D24AC, & D48AC Models On = open or 13V to +V
IN, IIN = 1-5mA typ.
Off = 0-0.8V, I
IN = 3-12mA typ.
D12AN, D24AN, & D48AN Models On = 0-0.8V, I
IN = 3-12mA typ.
Off = open or 3.3-5.5V, I
IN = 1-5mA typ.
Output
VOUT Accuracy (50% load): ±1.5% (±2% for model UWR-1.2/6000)
Minimum Loading for Specifi cation:
➁
1.2V/1.5V/1.8V/2.5V/3.3V/5V Outputs No load
12V/15V
Outputs 10% of IOUT max.
Minimum Loading for Stability:
➁
1.2V/1.5V/1.8V/2.5V/3.3V/5V Outputs No load
12V/15V
Outputs 25mA
Ripple/Noise (20MHz BW)
➀ ➅
See Ordering Guide
Line/Load Regulation See Ordering Guide
Effi ciency See Ordering Guide
Isolation Voltage:
Input-to-Output 1500Vdc minimum (functional)
Isolation Capacitance 470pF
Isolation Resistance 100M
Current Limiting:
1.2V-5V Outputs Hiccup technique, auto-recovery
12V and 15V
Outputs Power-limiting technique, auto-recovery
Overvoltage Protection Zener/transorb clamp, magnetic feedback
Temperature Coeffi cient ±0.04% per °C
Dynamic Characteristics
Transient Response (50% load step)
1.2V-2.5V models 200µsec max. to ±2% of fi nal value
3.3V-15V models 200µsec max. to ±1.5% of fi nal value
Start-Up Time:
➂
V
IN to VOUT 50msec
On/Off to V
OUT 30msec
www.murata-ps.com/support
UWR Models
Single Output,
High-Density,
6 Amp/15 Watt
DC/DC Converters
MDC_UWR_7-15.I02 Page 3 of 13
