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SLC100-12 数据表(PDF) 6 Page - C&D Technologies |
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SLC100-12 数据表(HTML) 6 Page - C&D Technologies |
6 / 10 page 6 SLC100 1.2V Rev C 11/2004 Product: www.cdpoweronline.com 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 internal monitor point temperature of 135oC. This protective feature is comprised of a thermistor in the units control loop. At a temperature of 135oC this circuit will cause the PWM to go into an idle mode, resulting in no output from the converter and prevent- ing damage to the converter components. When the temperature of the unit drops below 125oC the fault condition will clear and the converter will resume nor- mal 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 32.0 Vdc nominal will shut down the device. At an input voltage less than 32.0V 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 33.3V the unit will return to normal operation. The unit will typically turn on at an input voltage of between 33.3V and 34.5V 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. 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 trim- ming 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 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. 5.11V (100+∆%) - 511 - 10.22 kΩ Vref ∆% ∆% Vref=1.225 -10.22 kΩ [ [ Rtrim_down = 5.11 ∆% ) ( Rtrim_UP = out |
类似零件编号 - SLC100-12 |
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类似说明 - SLC100-12 |
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