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DQ63312QGL07PRT Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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DQ63312QGL07PRT Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
11 / 14 page Product # DQ63312QGL07 Phone 1-888-567-9596 Doc.# 005-2DQ312D Rev. B 10/7/03 Page 11 Technical Specification 48Vin 3.3/1.2Vout 68W Quarter Quarter Brick Dual Brick Dual BASIC OPERATION AND FEATURES The DualQor series converter uses a two-stage power circuit topology in which the two output voltages are cross regulated. The first stage is a buck-converter that keeps the output voltage constant over variations in line, load, and temperature. The sec- ond stage uses a transformer to provide the functions of input/output isolation and voltage step-down to achieve the low output voltage required. The two-stage solution is ideal for converters with multiple cross- regulated output voltages. The first-stage compensates for any variations in line voltage. Therefore, the dependence of the output voltage on line variations is minimized. Both the first stage and the second stage switch at a fixed fre- quency for predictable EMI performance. Rectification of the transformer’s output is accomplished with synchronous recti- fiers. These devices, which are MOSFETs with a very low on- state resistance, dissipate far less energy than Schottky diodes. This is the primary reason that the DualQor series of converters has such high efficiency, even at very low output voltages and very high output currents. Dissipation throughout the converter is so low that it does not require a heatsink for operation. However, baseplated ver- sions are available for optional heatsinking in severe ther- mal environments. The DualQor series converter uses the industry standard footprint and pin-out configuration. The DualQor has many standard control and protection fea- tures. All shutdown features are non-latching, meaning that the converter shuts off for 200 ms before restarting. (See Figure F) CONTROL FEATURES REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, per- mits the user to control when the converter is on or off. This input is referenced to the return terminal of the input bus, Vin(-). There are two versions of the converter that differ by the sense of the logic used for the ON/OFF input. In the positive logic version, the ON/OFF input is active high (meaning that a high turns the converter on). In the negative logic version, the ON/OFF signal is active low (meaning that a low turns the converter on). Figure A details five possible cir- cuits for driving the ON/OFF pin. Figure B is a detailed look of the internal ON/OFF circuitry. OUTPUT VOLTAGE TRIM (Pin 6): The TRIM input permits the user to adjust the output voltage up or down according to the trim range specifications. It is important to recognize that adjusting one output will also adjust the second output propor- tionally. To lower the output voltage, the user should connect a resistor between Pin 6 and Pin 4. To raise the output voltage, the user should connect a resistor between Pin 6 and Pin 5. The following table shows the resistor values needed to trim the out- put voltage up or down. Open Collector Enable Circuit Figure A: Various circuits for driving the ON/OFF pin. Figure B: Internal ON/OFF pin circuitry Remote Enable Circuit Direct Logic Drive Negative Logic (Permanently Enabled) Positive Logic (Permanently Enabled) ON/OFF Vin(_ ) ON/OFF ON/OFF Vin(_ ) ON/OFF 5V TTL/ CMOS Vin(_ ) ON/OFF Vin(_) Vin(_ ) TTL 5V 50k 274k Vin(+) ON/OFF Vin(_) 50k 100pF Vo(%) 1234 56789 10 R up 54.9 24.9 14.3 9.31 6.34 4.32 2.80 1.69 0.83 0 R down 68.1 30.1 17.8 11.5 7.68 5.36 3.48 2.10 1.05 0 |
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