UCH-15/6.7-D48NB-C【PDF 14/18 页】CONV DC/DC 100.5W 15V 6.7A

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Single Output UCH Models

Isolated, “Half-Brick”

1.8?15V Output 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, i.e. IEC/EN/UL 60950-1.

Input Reverse-Polarity Protection

If the input voltage polarity is reversed, an internal body 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

permanent damage to the converter. Please be sure to install a properly-

rated external input fuse (see Speci?cations).

Input Under-Voltage Shutdown and Start-Up Threshold

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

until the ramping-up 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 opera-

tion at a 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 ca-

Input Source Impedance

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

assuming that the source voltage has very low impedance and reasonable in-

put voltage regulation. Since real-world voltage sources have ?nite impedance,

performance is improved by adding external ?lter components. 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 (Cin 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 Cbus and Lbus components simulate a typical DC voltage bus. Your speci?c

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

the values of Cin, Lbus and Cbus will vary according to the speci?c converter

model.

pacitor inputs), the converter shuts off and then restarts as the external capaci-

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

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

TO

OSCILLOSCOPE

CURRENT

PROBE

+VIN

Start-Up Time

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

V IN

+

–

+

C BUS

L BUS

C IN

Start-Up Time (see Speci?cations) is the time interval between the point when

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

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

Actual measured times will vary with input source impedance, external input

capacitance, input voltage 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 its

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

The On/Off Remote Control interval from On command to Vout regulated

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

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. Similar conditions apply to the On to Vout regulated speci?cation

such as external load capacitance and soft start circuitry.

–

?VIN

C IN = 33μF, ESR < 700mΩ @ 100kHz

C BUS = 220μF, ESR < 100mΩ @ 100kHz

L BUS = 12μH

Figure 2. Measuring Input Ripple Current

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

and random deviations or PARD) may be reduced by adding ?lter elements

such as multiple external capacitors. Be sure to calculate component tempera-

ture rise from re?ected AC current dissipated inside capacitor ESR.

In the ?gure, the two copper strips simulate real-world printed circuit

impedances between the power supply and its load. In order to minimize circuit

errors and standardize tests between units, scope measurements should be

made using BNC connectors or the probe ground should not exceed one half

inch and soldered directly to the ?xture.

www.murata-ps.com/support

MDC_UCH Models.C01 Page 14 of 18

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