UNR-1.8/10-D5T-C データシートの表示（PDF） - Unspecified

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UNR-1.8/10-D5T-C

Single Output, Non-Isolated, 5 or 12VIN to 1.8/2.5/3.3VOUT 8 and 10 Amp DC/DC Converters

Unspecified 

Performance/Functional Specifications

Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ➀

Input

Input Voltage Range

D5 Models

D12 Models

3.0 to 3.6 Volts (3.3V nominal)

4.75-5.5 Volts (5V nominal)

10.8-13.6 Volts (12V nominal)

Input Current:

Normal Operating Conditions

Standby/Off Mode

See Ordering Guide

3.6mA typical

Input Ripple Current:

1.8/2.5V Models

3.3/8 -D5 Models

3.3/10 -D5 Models

3.3/8 -D12 Models

3/3/10 -D12 Models

Input Filter Type

150mAp-p

100mAp-p

150mAp-p

110mAp-p

250mAp-p

Capacitive

Overvoltage Protection

None

Reverse-Polarity Protection

On/Off Control: ➂

Functionality

Logic Threshold

None

TTL high (or open) = on, low = off

+0.8-2.0 Volts (1.5V typical)

Output

VOUT Accuracy (50% load):

1.8VOUT Models

2.5/3.3VOUT Models

VOUT Trim Range ➃

Trim pin tied to +Output:

Trim pin tied to Output Return

Temperature Coefficient

Ripple/Noise (20MHz BW) ➄

Line/Load Regulation

±2% of VOUT maximum

±1% of VOUT maximum

VOUT = 1.52 Volts or less

VOUT = 3.6 Volts or greater

±0.02% per °C

See Ordering Guide

See Ordering Guide

Efficiency

Overcurrent Protection: ➁

Technique

Overcurrent Detection Point

Average Short Circuit Current:

D5 Models

D12 Models

See Ordering Guide

"Hiccup" with auto-recovery

110-180% of rated current

1 Amp typical, 3 Amps maximum

4 Amp typical, 6 Amps maximum

Dynamic Characteristics

Transient Response (50-100% load):

1.8VOUT Models

1.8/2.5VOUT Models

3.3VOUT -D5 Models

3.3/8 -D12 Models

3.3/10 -D12 Models

100µsec to 3% of final value

25µsec to 2.5% of final value

50µsec to 2.5% of final value

50µsec to 1% of final value

50µsec to 2.5% of final value

Start-Up Time: ➅

VIN to VOUT

25/30msec (1.8/2.5VOUT models)

On/Off to VOUT 25/30msec (1.8/2.5VOUT models)

Switching Frequency

300kHz (±30kHz)

Environmental

Operating Temperature (Ambient): ➆

Without Derating

With Derating

See Derating Curves

to +100°C (See Derating Curves)

Storage Temperature

–40 to +105°C

Physical

Dimensions:

D5 Through-Hole Models

D5 Surface-Mount Models

D12 Through-Hole Models

D12 Surface-Mount Models

Flammability

2" x 1" x 0.39" (51 x 25 x 9.9mm)

2" x 1" x 0.43" (51 x 25 x 10.9mm)

2" x 1" x 0.48" (51 x 25 x 12.2mm)

2" x 1" x TBD" (51 x 25 x 12.7mm)

94V-0

www.murata-ps.com/support

UNR D5/D12 Series

Single Output, Non-Isolated, 5 or 12VIN to 1.8/2.5/3.3VOUT

8 and 10 Amp DC/DC Converters

Physical

Shielding

5 sided

Case Connection

Input/Output Return

Case Material

Corrosion-resistant steel with

non-conductive, epoxy-based, black

enamel finish and plastic baseplate

Pin Material

RoHS: Gold plate over copper alloy

Non-RoHS: Pure tin on copper alloy with

nickel underplate

➀ All models are tested and specified with an external 470µF input capacitor with a 20mΩ

ESR and a 6Arms ripple-current rating, as well as a 22µF output capacitor with a 200mΩ ESR.

See I/O Filtering and Noise Reduction for more details. These devices have no minimum-load

requirements and will regulate under no-load conditions. Listed specifications apply for both

"T" and "SM" models as appropriate.

➁ See Output Overcurrent Detection for details.

➂ See On/Off Control for details.

➃ See Output Voltage Trimming for details.

➄ For all models, output noise can be further reduced with the installation of additional

external output capacitors. See I/O Filtering and Noise Reduction for details.

➅ See Start-Up Time for details.

➆ See Temperature Derating for details.

Absolute Maximum Ratings

Input Voltage:

Continuous:

D5 Models

D12 Models

Transient (100msec)

7 Volts

15 Volts

15 Volts

Input Reverse-Polarity Protection

None

Input/Output Overvoltage Protection None

Output Current

Current limited. Devices can

withstand a sustained output

short circuit without damage.

Storage Temperature

–40 to +105°C

Lead Temperature (Soldering, 10 sec.) +300°C

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.

TECHNICAL NOTES

Return Current Paths

These are non-isolated DC/DC converters. The Input Return, Output Return

and Logic Ground pins are all connected together internally. To the extent

possible, all input and load currents should be returned through the Input

Return and Output Return, respectively (via low-impedance runs). Any con-

trol signals applied to the On/Off Control pin should be referenced to Logic

Ground. The internal trace leading to Logic Ground is not designed to carry

high current. Consequently, devices should never be installed in a manner

that results in high current flow through Logic Ground (i.e., the Input/Output

Return pins should never be left open or connected via high-impedance paths).

I/O Filtering and Noise Reduction

All UNR 18-33W Series converters are tested and specified with external

470µF input capacitors (20mΩ ESR, 6Arms ripple-current rating) and

external 22µF output capacitors (200mΩ ESR). External input capacitance is

required and must be rated to handle the input ripple current as follows:

√ ( ) IRMS = IOUT

VOUT

VIN

1 – VOUT

VIN

In critical applications, input/output ripple/noise may be further reduced by

installing additional I/O caps.

UNR18-33W.C01 Page 3 of 9

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