UWE-5/20-Q48NB-C【PDF 22/27 页】DC/DC CONVERT 5V 20A 1/8TH BRICK

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UWE-100-120W Series

Wide Input, Isolated Eighth-Brick DC-DC Converters

TECHNICAL NOTES

Input Fusing

Certain applications and/or safety agencies may require the installation of

fuses at the inputs of power conversion components. Fuses should also be

used if the possibility of sustained, non-current-limited, input-voltage polarity

reversals exist. For MPS UWE DC-DC Converters, you should use fast-blow type

fuses, installed in the ungrounded input supply line. Refer to the speci?cations

for fuse values.

All relevant national and international safety standards and regulations must

be observed by the installer. For system safety agency approvals, the convert-

ers must be installed in compliance with the requirements of the end-use

safety standard, e.g., IEC/EN/UL60950-1.

Fuse

Input Source Impedance

UWE converters must be driven from a low ac-impedance input source.

The DC-DC’s performance and stability can be compromised by the use of

highly inductive source impedances. For optimum performance, compo-

nents should be mounted close to the DC-DC converter. If the application

has a high source impedance, low V IN models can benefit from increased

external input capacitance.

I/O Filtering, Input Ripple Current, and Output Noise

All models in the UWE Converters are tested/speci?ed for input re?ected ripple

current and output noise using the speci?ed external input/output components/

circuits and layout as shown in the following two ?gures.

External input capacitors (C IN in Figure 3) serve primarily as energy-storage

elements, minimizing line voltage variations caused by transient IR drops in

conductors from backplane to the DC-DC. Input caps should be selected for bulk

+V IN

+V IN

+V O

capacitance (at appropriate frequencies), low ESR, and high rms-ripple-current

ratings. The switching nature of DC-DC converters requires that dc voltage

sources have low ac impedance as highly inductive source impedance can affect

R LOAD

system stability. In Figure 3, C BUS and L BUS simulate a typical dc voltage bus. Your

speci?c system con?guration may necessitate additional considerations.

–V IN

–V IN

–V O

In critical applications, output ripple/noise (also referred to as periodic and

random deviations or PARD) may be reduced below speci?ed limits using ?lter-

Figure 2. Input Fusing

Input Undervoltage Shutdown and Start-Up Threshold

Under normal start-up conditions, devices will not begin to regulate until

the ramping-up input voltage exceeds the Start-Up Threshold Voltage. Once

operating, devices will not turn off until the input voltage drops below the

Undervoltage Shutdown limit. Subsequent re-start will not occur until the input

is brought back up to the Start-Up Threshold. This built in hysteresis prevents

any unstable on/off situations from occurring at a single input voltage.

ing techniques, the simplest of which is the installation of additional external

output capacitors. These output caps function as true ?lter elements and

should be selected for bulk capacitance, low ESR and appropriate frequency

response. All external capacitors should have appropriate voltage ratings and

be located as close to the converter as possible. Temperature variations for all

relevant parameters should also be taken carefully into consideration.

The most effective combination of external I/O capacitors will be a function

of line voltage and source impedance, as well as particular load and layout

conditions.

Start-Up Time

The V IN to V OUT Start-Up Time is the interval of time between the point at which

the ramping input voltage crosses the Start-Up Threshold and the fully loaded

output voltage enters and remains within its speci?ed accuracy band. Actual

TO

OSCILLOSCOPE

CURRENT

PROBE

+VIN

measured times will vary with input source impedance, external input/output

capacitance, and load. The UWE Series implements a soft start circuit that

limits the duty cycle of its PWM controller at power up, thereby limiting the

V IN

+

–

C BUS

L BUS

C IN

input inrush current.

The On/Off Control to V OUT start-up time assumes the converter has its

nominal input voltage applied but is turned off via the On/Off Control pin. The

speci?cation de?nes the interval between the point at which the converter is

C IN = 33μF, ESR < 700mΩ @ 100kHz

C BUS = 220μF, ESR < 100mΩ @ 100kHz

L BUS = 12μH

–VIN

turned on and the fully loaded output voltage enters and remains within its

speci?ed accuracy band. Similar to the V IN to V OUT start-up, the On/Off Control

Figure 3. Measuring Input Ripple Current

to V OUT start-up time is also governed by the internal soft start circuitry and

external load capacitance.

The difference in start up time from V IN to V OUT and from On/Off Control to

V OUT is therefore insigni?cant.

www.murata-ps.com/support

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