UEI30-050-Q48N-C【PDF 13/18 页】CONVERT DC/DC 30W 5V SNGL NEG

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UEI30 Series

30W Isolated Wide-Range DC-DC Converters

TECHNICAL NOTES

Input Fusing

Certain applications and/or safety agencies may require fuses at the inputs of

power conversion components. Fuses should also be used when there is the

possibility of sustained input voltage reversal which is not current-limited. For

greatest safety, we recommend a fast blow fuse installed in the ungrounded

input supply line.

The installer must observe all relevant safety standards and regulations. For

safety agency approvals, install the converter in compliance with the end-user

safety standard.

Input Reverse-Polarity Protection

If the input voltage polarity is reversed, an internal diode will become forward

biased and likely draw excessive current from the power source. If this source

is not current-limited or the circuit appropriately fused, it could cause perma-

nent damage to the converter.

Input Under-Voltage Shutdown and Start-Up Threshold

Under normal start-up conditions, converters will not begin to regulate properly

until the rising input voltage exceeds and remains at the Start-Up Threshold

Voltage (see Speci?cations). Once operating, converters will not turn off until

the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent

restart will not occur until the input voltage rises again above the Start-Up

Threshold. This built-in hysteresis prevents any unstable on/off operation at a

Sometimes only a small ceramic capacitor is suf?cient. Since it is dif?cult to

totally characterize all applications, some experimentation may be needed.

Note that external input capacitors must accept high speed switching currents.

Because of the switching nature of DC/DC converters, the input of these

converters must be driven from a source with both low AC impedance and

adequate DC input regulation. Performance will degrade with increasing input

inductance. Excessive input inductance may inhibit operation. The DC input

regulation speci?es that the input voltage, once operating, must never degrade

below the Shut-Down Threshold under all load conditions. Be sure to use

adequate trace sizes and mount components close to the converter.

I/O Filtering, Input Ripple Current and Output Noise

All models in this converter series are tested and speci?ed for input re?ected

ripple current and output noise using designated external input/output compo-

nents, circuits and layout as shown in the ?gures below. External input capaci-

tors (C IN in the ?gure) serve primarily as energy storage elements, minimizing

line voltage variations caused by transient IR drops in the input conductors.

Users should select input capacitors for bulk capacitance (at appropriate

frequencies), low ESR and high RMS ripple current ratings. In the ?gure below,

the C BUS and L BUS components simulate a typical DC voltage bus. Your speci?c

system con?guration may require additional considerations. Please note that the

values of C IN , L BUS and C BUS will vary according to the speci?c converter model.

TO

single input voltage.

Users should be aware however of input sources near the Under-Voltage

Shutdown whose voltage decays as input current is consumed (such as capaci-

OSCILLOSCOPE

+

L BUS

CURRENT

PROBE

1

+VIN

tor inputs), the converter shuts off and then restarts as the external capacitor

recharges. Such situations could oscillate. To prevent this, make sure the operat-

ing input voltage is well above the UV Shutdown voltage AT ALL TIMES.

V IN

–

+

–

C BUS

C IN

2

?VIN

Start-Up Delay

Assuming that the output current is set at the rated maximum, the Vin to Vout Start-

Up Delay (see Speci?cations) is the time interval between the point when the rising

input voltage crosses the Start-Up Threshold and the fully loaded regulated output

voltage enters and remains within its speci?ed regulation band. Actual measured

times will vary with input source impedance, external input capacitance, input volt-

age slew rate and ?nal value of the input voltage as it appears at the converter.

These converters include a soft start circuit to moderate the duty cycle of the

PWM controller at power up, thereby limiting the input inrush current.

The On/Off Remote Control interval from inception to V OUT regulated

C IN = 33μF, ESR < 700mΩ @ 100kHz

C BUS = 220μF, ESR < 100mΩ @ 100kHz

L BUS = 12μH

Figure 2. Measuring Input Ripple Current

+VOUT

assumes that the converter already has its input voltage stabilized above the

C1

C2

SCOPE

R LOAD

Start-Up Threshold before the On command. The interval is measured from the

On command until the output enters and remains within its speci?ed accuracy

band. The speci?cation assumes that the output is fully loaded at maximum

rated current.

Input Source Impedance

These converters will operate to speci?cations without external components,

assuming that the source voltage has very low impedance and reason-

able input voltage regulation. Since real-world voltage sources have ?nite

?VOUT

C1 = 1μF

C2 = 10μF LOW ES

LOAD 2-3 INCHES (51-76mm) FROM MODULE

Figure 3. Measuring Output Ripple and Noise (PARD)

impedance, performance is improved by adding external ?lter components.

www.murata-ps.com/support

MDC_UEI Series 30W.B01 Page 13 of 18

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