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Q48SA52001NNFA Datasheet(PDF) 8 Page - Delta Electronics, Inc. |
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Q48SA52001NNFA Datasheet(HTML) 8 Page - Delta Electronics, Inc. |
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8 / 13 page  DS_Q48SA52001_05142009 8 FEATURES DESCRIPTIONS Over-Current Protection The modules include an internal output over-current protection circuit, which will endure current limiting for an unlimited duration during output overload. If the output current exceeds the OCP set point, the modules will automatically shut down (hiccup mode). The modules will try to restart after shutdown. If the overload condition still exists, the module will shut down again. This restart trial will continue until the overload condition is corrected. Over-Voltage Protection The modules include an internal output over-voltage protection circuit, which monitors the voltage on the output terminals. If this voltage exceeds the over-voltage set point, the module will shut down and latch off. The over-voltage latch is reset by either cycling the input power or by toggling the on/off signal for one second. Also, an option of hiccup mode for OVP is available. Under hiccup mode, the modules will try to restart after shutdown. If the over voltage condition still exists, the module will shut down again. This restart trial will continue until the over voltage condition is corrected. Over-Temperature Protection The over-temperature protection consists of circuitry that provides protection from thermal damage. If the temperature exceeds the over-temperature threshold the module will shut down. The module will try to restart after shutdown. If the over-temperature condition still exists during restart, the module will shut down again. This restart trial will continue until the temperature is within specification. Remote On/Off The remote on/off feature on the module can be either negative or positive logic. Negative logic turns the module on during a logic low and off during a logic high. Positive logic turns the modules on during a logic high and off during a logic low. Remote on/off can be controlled by an external switch between the on/off terminal and the Vi(-) terminal. The switch can be an open collector or open drain. For negative logic if the remote on/off feature is not used, please short the on/off pin to Vi(-). For positive logic if the remote on/off feature is not used, please leave the on/off pin to floating. Figure 15: Remote on/off implementation Output Voltage Adjustment (TRIM) To increase or decrease the output voltage set point, the modules may be connected with an external resistor between the TRIM pin and either Vo(+) or Vo(-).The TRIM pin should be left open if this feature is not used. Figure 16: Circuit configuration for trim-up (increase output voltage) If the external resistor is connected between the TRIM and Vo(-) pin, the output voltage set point increases (Fig. 17). The external resistor value required value required to obtain output voltage change △U is defined as: ) ( 7 . 4 U 5 . 127 Ω − Δ = − K R up trim Ex. When Trim-up 5%， U △ is 5%*Vnormal=0.05*52.5=2.625 Ω = − = − K R up trim 87 . 43 7 . 4 625 . 2 5 . 127 |
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