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JW100A1 Datasheet(PDF) 11 Page - Tyco Electronics |
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JW100A1 Datasheet(HTML) 11 Page - Tyco Electronics |
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11 / 20 page  Tyco Electronics Corp 11 Data Sheet July 1999 dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W JW050A, JW075A, JW100A, JW150A Power Modules: Feature Descriptions (continued) Remote Sense Remote sense minimizes the effects of distribution losses by regulating the voltage at the remote-sense connections. The voltage between the remote-sense pins and the output terminals must not exceed the out- put voltage sense range given in the Feature Specifica- tions table, i.e.: [VO(+) – VO(–)] – [SENSE(+) – SENSE(–)] ≤ 0.5 V The voltage between the VO(+) and VO(–) terminals must not exceed the minimum value of the output over- voltage protection. This limit includes any increase in voltage due to remote-sense compensation and output voltage set-point adjustment (trim). See Figure 21. 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. 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. Consult the factory if you need to increase the output voltage more than the above limitation. 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. 8-651 (C).m Figure 21. Effective Circuit Configuration for Single-Module Remote-Sense Operation Output Voltage Set-Point Adjustment (Trim) Output voltage trim 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. The trim resistor should be positioned close to the module. If not using the trim feature, leave the TRIM pin open. With an external resistor between the TRIM and SENSE(–) pins (Radj-down), the output voltage set point (VO, adj) decreases (see Figure 22). The following equa- tion determines the required external-resistor value to obtain a percentage output voltage change of ∆%. The test results for this configuration are displayed in Figure 23. This figure applies to all output voltages. With an external resistor connected between the TRIM and SENSE(+) pins (Radj-up), the output voltage set point (VO, adj) increases (see Figure 24). The following equation determines the required exter- nal-resistor value to obtain a percentage output voltage change of ∆%. The test results for this configuration are displayed in Figure 25. The voltage between the VO(+) and VO(–) terminals must not exceed the minimum value of the output over- voltage protection. This limit includes any increase in voltage due to remote-sense compensation and output voltage set-point adjustment (trim). See Figure 21. 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. Consult the factory if you need to increase the output voltage more than the above limitation. 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. VO(+) SENSE(+) SENSE(–) VO(–) VI(+) VI(–) IO LOAD CONTACT AND DISTRIBUTION LOSSES SUPPLY II CONTACT RESISTANCE Radj-down 100 ∆% ---------- 2 – kΩ = Radj-up VO 100 ∆% + () 1.225 ∆% -------------------------------------- 100 2 ∆% + () ∆% ---------------------------------- – kΩ = |
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