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QBDW033A0B41-HZ Datasheet(PDF) 9 Page - Lineage Power Corporation |
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QBDW033A0B41-HZ Datasheet(HTML) 9 Page - Lineage Power Corporation |
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9 / 17 page  Advanced Data Sheet February 10, 2011 QBDW033A0B Series Power Modules; DC-DC Converters 36-75Vdc Input; 9.6-12Vdc Output; 33A Output Current LINEAGE POWER 9 Feature Descriptions (continued) Remote Sense Remote sense minimizes the effects of distribution losses by regulating the voltage at the remote-sense connections (See Figure 11). The voltage between the remote-sense pins and the output terminals must not exceed the output voltage sense range given in the Feature Specifications table: [VO(+) – VO(–)] – [SENSE(+) – SENSE(–)] 0.5 V Although the output voltage can be increased by both the remote sense and by the trim, the maximum increase for the output voltage is not the sum of both. The maximum increase is the larger of either the remote sense or the trim. The amount of power delivered by the module is defined as the voltage at the output terminals multiplied by the output current. When using remote sense and trim, the output voltage of the module can be increased, which at the same output current would increase the power output of the module. Care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power (Maximum rated power = Vo,set x Io,max). Figure 11. Circuit Configuration for remote sense . Configurable Control Pins The QBDW033A0B contains two configurable control pins, T/C1 and C2, referenced to the module secondary SIGGND. See Mechanical Views for pin locations. The following table list the available factory configurations for the functions assigned to these pins. Additional configurations can accomplished via the PMBus interface. Following the tables, there is a feature description for each function. Pin Designation/Function Factory Configuration T/C1 C2 Trim TM Power Good PG Modules without -P Load Share CS Power Good PG Modules with -P C2 Pin Designation/Function Configurable via PMBus Power Good PG On/Off(o) Trim, Output Voltage Programming, TM Trimming allows the output voltage set point to be increased or decreased; this is accomplished by connecting an external resistor between the TRIM pin and either the VO(+) pin or the VO(-) pin. VO(+) T/C1 VO(-) Rtrim-down LOAD QBDW033A0B Rtrim-up Figure 12. Circuit Configuration to Trim Output Voltage. Connecting an external resistor (Rtrim-down) between the T/C1 pin and the Vo(-) (or Sense(-)) pin decreases the output voltage set point. To maintain set point accuracy, the trim resistor tolerance should be ±1.0%. The following equation determines the required external resistor value to obtain a percentage output voltage change of Δ% 22 . 10 % 511 down trim R Where 100 % , , set o desired set o V V V For example, to trim-down the output voltage of the module by 20% to 9.6V, Rtrim-down is calculated as follows: 20 % 22 . 10 20 511 down trim R k R down trim 3 . 15 Connecting an external resistor (Rtrim-up) between the T/C1 pin and the VO(+) (or Sense (+)) pin increases the output voltage set point. The following equations determine the required external resistor value to obtain a percentage output voltage change of Δ%: 22 . 10 % 511 % 225 . 1 %) 100 ( 11 . 5 , set o up trim V R Where 100 % , , set o set o desired V V V For example, to trim-up the output voltage of the module by 5% to 12.6V, Rtrim-up is calculated is as follows: 5 % 22 . 10 5 511 5 225 . 1 ) 5 100 ( 0 . 12 11 . 5 up trim R 2 . 102 up trim R VO(+) SENSE(+) SENSE(–) VO(–) VI(+) VI(-) IO LOAD CONTACT AND DISTRIBUTION LOSSE SUPPLY II CONTACT RESISTANCE |
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