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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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QPW025A0F41 데이터시트(PDF) 8 Page - Lineage Power Corporation |
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QPW025A0F41 데이터시트(HTML) 8 Page - Lineage Power Corporation |
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8 / 14 page  Data Sheet May 7, 2008 QPW025A0F41/QPW025A0F41-H DC-DC Power Module 36-75Vdc Input; 3.3Vdc Output Voltage; 25A Output Current LINEAGE POWER 8 Feature Descriptions (continued) operates normally once the output current is reduced back into its specified range. Input Undervoltage Lockout At input voltages below the input undervoltage lockout limit, the module operation is disabled. The module will begin to operate at an input voltage between the undervoltage lockout limit and the minimum operating input voltage. Overtemperature Protection T o provide over temperature protection in a fault condition, the unit relies upon the thermal protection feature of the controller IC. The unit will shut down if the thermal reference point Tref, exceeds the specified maximum temperature threshold, but the thermal shutdown is not intended as a guarantee that the unit will survive temperatures beyond its rating. The module will automatically restart after it cools down. Over Voltage Protection The output overvoltage protection clamp consists of control circuitry, independent of the primary regulation loop, which monitors the voltage on the output terminals. This control loop has a higher voltage set point than the primary loop (See the overvoltage clamp values in the Feature Specifications). In a fault condition, the overvoltage clamp ensures that the output voltage does not exceed Vo, clamp(max). This provides a redundant voltage-control that reduces the risk of output overvoltage. 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(–)] ≤ 10% of VO,rated The voltage between the VO(+) and VO(–) terminals must not exceed the minimum output overvoltage shutdown value indicated in the Feature Specifications table. This limit includes any increase in voltage due to remote- sense compensation and output voltage setpoint adjustment (trim) (see Figure 11). If not using the remote-sense feature to regulate the output at the point of load, then connect SENSE(+) to VO(+) and SENSE(–) to VO(–) at the module. 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). VO(+) SENSE(+) SENSE(–) VO(–) VI(+) VI(-) IO LOAD CONTACT AND DISTRIBUTION LOSSE SUPPLY II CONTACT RESISTANCE Figure 11. Circuit Configuration to program output voltage using external resistor. Output Voltage Programming Trimming allows the user to increase or decrease the output voltage set point of a module. This is accomplished by connecting an external resistor between the TRIM pin and either the SENSE(+) or SENSE(-) pins. A resistor placed between the Trim pin and Sense (+) increases the output voltage and a resistor placed between the Trim pin and Sense (-) decreases the output voltage. Figure 12 shows the circuit configuration using an external resistor. The trim resistor should be positioned close to the module. If the trim pin is not used then the pin shall be left open . VO(+) TRIM VO(-) Rtrim-down LOAD VIN(+) ON/OFF VIN(-) Rtrim-up SENSE (+) SENSE (-) Figure 12. Circuit Configuration to program output voltage using an external resistor. The following equations determine the required external resistor value to obtain a percentage output voltage change of Δ%. To decrease output voltage set point: Ω ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − Δ = − K R down trim 2 . 10 % 510 |
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