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SLC100-3 Datasheet(PDF) 6 Page - Murata Power Solutions Inc. |
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SLC100-3 Datasheet(HTML) 6 Page - Murata Power Solutions Inc. |
6 / 9 page 6 Remote ON/OFF Function Figure 4 – Remote ON/OFF Control Circuit Protective Functions Temperature Shutdown The over temperature shutdown feature of the SLC100 will cause the unit to shutdown at a typical pwb tem- perature of TBD. This protective feature is comprised of a thermistor in the units control loop. At a tempera- ture of TBD this circuit will cause the PWM to go into an idle mode, resulting in no output from the converter and preventing damage to the converter components. When the temperature of the unit drops below TBD the fault condition will clear and the converter will resume normal operation. If the cause of the over temperature condition is not identified and corrected the unit will continue to cycle on and off indefinitely. Input Under-Voltage Shutdown The nominal input voltage for the SLC100 is 48Vdc. Once turned on reducing the input voltage to 32.5 Vdc nominal will shut down the device. At an input voltage less than 32.5V the under-voltage sensing circuit will send a signal to the PWM causing it to go into idle mode. This will result in no output from the converter, protecting the unit from a high input current condition. When the input voltage returns to a level above 32.5V the unit will return to normal operation. The unit will typically turn on at an input voltage of 33.7V nominal as indicated on the Product Data Sheet. This is due to hysterisis designed into the protective circuit to prevent excessive cycling of the converter. The SLC100 is equipped with a primary ON/OFF pin used to remotely turn the converter on or off via a system signal. The input is TTL open-collector and/or FET open- drain compatible. For the positive logic model a system logic low signal will turn the unit off. For negative logic models a system logic high signal will turn the converter off. For negative logic models where no control signal will be used the ON/OFF pin should be connected directly to –Vin to ensure proper operation. For positive logic models where no control signal will be used the ON/OFF pin should be left open. SLC100 + Sense - Sense Trim + Vout - Vout + Vin ON/OFF - Vin (Top View) Control Signal APPLICATION NOTES The resistance value required to achieve the desired amount of positive/negative trim can be determined by referring to the trim table for each model. If trimming is not desired then the Trim pin may be left open. In addition to the resistor values provided in the trim tables, the following equations can be use to calculate the required resistor value for a desired output voltage. These equations apply for the 1.5V and above models. For 1.2V models the trim tables must be used. Remote ON/OFF Control Function SLC100 + Sense - Sense Trim + Vout - Vout + Vin ON/OFF - Vin (Top View) Load R T Figure 3 – Trim Down Circuit To lower the converter output voltage a resistor must be placed between the Trim pin and -Vout pin as shown in Figure 3. Brick Wall Current Limiting To protect against fault or short-circuit conditions on the output, each module is equipped with current-limit- ing circuitry designed to provide continuous protection. After reaching the current limit point (typically 20% above the rated output current), the voltage will range between its rated value and zero, depending upon the amount of overload. The unit will remain in operation continuously during this period down to a short-circuit condition. Once the short or overload has been elimi- nated, the output voltage will return to normal without cycling the input power. |
Similar Part No. - SLC100-3 |
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Similar Description - SLC100-3 |
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