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TWR-5/3-15/250-D48N-C Datasheet(PDF) 5 Page - Murata Manufacturing Co., Ltd. |
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TWR-5/3-15/250-D48N-C Datasheet(HTML) 5 Page - Murata Manufacturing Co., Ltd. |
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5 / 9 page  Safety Considerations The TWR’s must be installed with consideration for any local safety, certification or regulatory requirements. These vary widely but generally are concerned with properly sized conductors, adequate clearance between higher voltage circuits, life testing, thermal stress analysis of components and flammability of components. Contact DATEL if you need further advice on these topics. Remote On/Off Control The TWR models include an input pin which can turn on or shut off the converter by remote signal. For positive logic models (no model number suffix), if this pin is left open, the converter will always be enabled as long as proper input power is present. On/Off signal currents are referred to the Input Common pin on the converter. There is a short time delay of several milliseconds (see the specifications) for turn on, assuming there is no significant external output capacitance. The On/Off Control may also be supplied with negative logic (LO = on, HI = off) using the “N” model number suffix. Here again, leaving the pin open on either model will enable the converter. Positive logic models must have this control pin pulled down for shutoff. Negative logic models must pull up this control pin for shutoff. Dynamic control of this On/Off input is best done with either a mechani- cal relay (ground the pin to turn it off), solid state relay (SSR), an open collector or open drain transistor, CPU bit or a logic gate. The pull down current is 18mA max. Observe the voltage limits listed in the specifications for proper operation. Suggested circuits are shown below. Figure 3. On/Off Control With An External CMOS Gate Figure 4. On/Off Control With An External Transistor Isolation Considerations These converters use both transformer and optical coupling to isolate the inputs from the outputs. Ideal “floating” isolation implies ZERO CUR- RENT flowing between the two Common return sections of the input and output up to the working isolation voltage limit. Real-world isolation on this converter includes both an AC current path (through some small coupling capacitance) and some DC leakage current between the two ground systems. To avoid difficulties in your application, be sure that there are not wideband, high amplitude AC difference voltages between the two ground systems. In addition, ground difference voltages applied by your external circuits which exceed the isolation voltage, even momentarily, may damage the converter’s isolation barrier. This can either destroy the converter or instantly render it non-isolated. Current Limiting and Short Circuit Condition As the output load increases above its maximum rated value, the converter will enter current limiting mode. The output voltage will decrease and the converter will essentially deliver constant power. This is commonly called power limiting. If the current continues to increase, the converter will enter short circuit operation and the PWM controller will shut down. Following a time-out period, the converter will automatically attempt to restart. If the short circuit is detected again, the converter will shut down and the cycle will repeat. This operation is called hiccup autorecovery. Please be aware that excessive external output capacitance may interfere with the hiccup autorestart. Output Filtering and Noise Reduction All switching DC/DC converters produce wideband output noise which radiates both through the wiring (conducted emission) and is broadcast into the air (radiated emission). This output noise may be attenuated by adding a small amount of capacitance in parallel with the output terminals. Please refer to the maximum output capacitance in the Specifications. The amount of capacitance to add depends on the placement of the cap (near the converter versus near the load), the distance from the converter to the load (and resulting series inductance), the topology and locations of load elements if there are multiple parallel loads and the nature of the loads. For switching loads such as CPU’s and logic, this last item recom- mends that small bypass capacitors be placed directly at the load. Very high clock speeds suggest smaller caps unless the instantaneous current changes are high. If the load is a precision high-gain linear section, addi- tional filtering and shielding may be needed. Many applications will need no additional capacitance. However, if more capacitance is indicated, observe these factors: 1. Understand the noise-reduction objective. Are you improving the switch- ing threshold of digital logic to reduce errors? (This may need only a small amount of extra capacitance). Or do you need very low noise for a precision linear “front end”? 2. Use just enough capacitance to achieve your objective. Additional capacitance trades off increasing instability (actually adding noise rather than reducing it), poor settling response, possible ringing or outright oscillation by the converter. Excessive capacitance may also disable the hiccup autorestart. Do not exceed the maximum output capacitance specification. MDC_TWR22.B02 Page 5 of 9 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com Triple Output/TWR Models Isolated, High Reliability 1" x 2" DC/DC Converters |
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