UNR-1.8/2-D5SM データシートの表示（PDF） - DATEL Data Acquisition products

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UNR-1.8/2-D5SM

Surface-Mount, Non-Isolated 1.8/2.5/3.3V, 3.6-10W DC/DC Converters

DATEL Data Acquisition products  

NON-ISOLATED, 3.6-10W, SURFACE-MOUNT DC/DC CONVERTERS

SM Models

Performance/Functional Specifications

Typical @ TA = +25°C under nominal line voltage and full-load conditions with no external filtering,

À unless noted.

Input

Input Voltage Range:

"D5" Models:

UNR-1.8/2-D5SM

4.5-5.5 Volts (5V nominal)

UNR-2.5/2-D5SM, UNR-3.3/3-D5SM 4.75-5.5 Volts (5V nominal)

"D12" Models

10.4-13.6 Volts (12V nominal)

Overvoltage Shutdown

None

Start-Up Threshold:

Á "D12" Models

10.2V typical, 10.4V maximum

Undervoltage Shutdown:

Á "D12" Models

9.6V typical, 8.2V minimum

Input Current:

Normal Operating Conditions

Standby Mode (Off or undervoltage):

UNR-1.8/2-D5SM

UNR-2.5/2-D5SM, UNR-3.3/3-D5SM

UNR-3.3/3-D12SM

See Ordering Guide

20mA typical, 30mA maximum

10mA typical, 20mA maximum

5mA typical, 10mA maximum

Input Ripple Current:

UNR-1.8/2-D5SM, UNR-3.3/3-D12SM 50mArms

UNR-2.5/2-D5SM, UNR-3.3/3-D5SM 150mArms

Input Filter Type

Capacitive

Reverse-Polarity Protection

 On/Off Control (Pin 3)

None

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

1.5V typical logic threshold

Output

VOUT Accuracy (50% load):

UNR-1.8/2-D5SM

UNR-2.5/2-D5SM

UNR-3.3/3-D5SM

UNR-3.3/3-D12SM

±1.5% (±27mV) maximum

±1.5% (±37.5mV) maximum

±1.5% (±50mV) maximum

±1% (±33mV) maximum

Temperature Coefficient

à Ripple/Noise (20MHz BW)

±0.02% per °C

See Ordering Guide

Line/Load Regulation

See Ordering Guide

Efficiency

Ä Current Limiting

See Ordering Guide

Auto-recovery

Dynamic Characteristics

Transient Response (50% load step):

UNR-1.8/2-D5SM

UNR-2.5/2-D5SM, UNR-3.3/3-D12SM

UNR-3.3/3-D5SM

Å Start-Up Time:

VIN to VOUT: "D5" Models

"D12" Models

On/Off to VOUT: "D5" Models

"D12" Models

20µsec to ±0.5% of final value

30µsec to ±1% of final value

40µsec to ±1% of final value

100msec typical, 120msec maximum

13msec typical, 20msec maximum

60msec typical, 120msec maximum

13msec typical, 20msec maximum

Switching Frequency

200kHz (±30kHz)

Environmental

Operating Temperature (Ambient):

Without Derating

With Derating

–40 to +70°C

to +100°C (See Derating Curves)

Storage Temperature

–40 to +105°C

Dimensions

Shielding

Case Connection

Case Material

Pin Material

Weight

Physical

1" x 1" x 0.47" (25 x 25 x 11.9mm)

None

None

Corrosion-resistant steel with

non-conductive, epoxy-based, black

enamel finish and plastic baseplate

Copper, tin plated

0.6 ounces (17 grams)

À "D5" models require a minimum 300mA load current to maintain specified regulation. "D12"

models have no minimum load requirement. Operating "D5" models under no-load conditions

will not damage these devices, however they may not meet all listed specifications. The

UNR-1.8/2-D5SM requires an external 15Ω pull-up resistor between VIN and On/Off Control for

normal operation. See On/Off Control for details. The UNR-3.3/3-D12SM is specifiied with an

external 22µF input capacitor. See I/O Filtering for details.

Á See Startup Threshold and Undervoltage Shutdown for details.

 See On/Off Control for details.

à The 22µF external input capacitor required for the UNR-3.3/3-D12SM should be minimally

rated for 1.5Arms ripple current and 125mΩ ESR. Output noise for all models can be further

reduced with the installation of external output capacitors. See See I/O Filtering for details.

Ä Current limiting initiates at approximately 30% above rated load. Under short-circuit

conditions, output current folds back to approximately 150mA and input current drops to

approximtely 50mA. Both remain at those levels until the short is removed.

Å See Start-Up Time for details.

Absolute Maximum Ratings

Input Voltage:

Continuous:

"D5" Models

"D12" Models

Transient (100msec):

"D5" Models

"D12" Models

Input Reverse-Polarity Protection

Output Overvoltage Protection

Output Current

Storage Temperature

Lead Temperature (Soldering, 10 sec.)

7 Volts

15 Volts

15 Volts

24 Volts

None

None

Current limited. Devices can

withstand a sustained output

short circuit without damage.

–40 to +105°C

+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.

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