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JFC100C3 Datasheet(PDF) 11 Page - Tyco Electronics |
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JFC100C3 Datasheet(HTML) 11 Page - Tyco Electronics |
11 / 20 page Tyco Electronics Corp. 11 Data Sheet October 1999 dc-dc Converters; 18 to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W JFC050C, JFC075C, JFC100C Power Modules: Feature Descriptions (continued) Output Voltage Set-Point Adjustment (Trim) (continued) 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. 8-715 (C).d Figure 15. Circuit Configuration to Increase Output Voltage Note: The output voltage of this module may be increased to a maximum of 0.5 V. The 0.5 V is the combination of both the remote-sense and the output voltage set-point adjustment (trim). Do not exceed 15.5 V between the VO(+) and VO(–) terminals. The following equation determines the required exter- nal-resistor value to obtain a percentage output voltage change of ý%. Only trim up to 0.5 V maximum. See note above. The test results for this configuration are displayed in Figure 16. For applications requiring voltage between 15 V and 24 V, consider using the JFC050H, JFC075H, JFC100H, or JFC150H (24 V) trimmed down. The voltage between the VO(+) and VO(–) terminals must not exceed the output overvoltage shutdown volt- age. This limit includes any increase in voltage due to remote-sense compensation and output voltage set- point adjustment (trim). 8-2082 (C) Figure 16. Resistor Selection for Increased Output Voltage Output Overvoltage Protection The output overvoltage shutdown consists of control circuitry, independent of the primary regulation loop, that monitors the voltage on the output terminals. The control loop of the clamp has a higher voltage set point than the primary loop (see Feature Specifications table). This provides a redundant voltage control that reduces the risk of output overvoltage and latches the converter off if an overvoltage occurs. Recovery from latched shutdown is accomplished by cycling the dc input power off for at least 1.0 second or by toggling the primary or secondary referenced remote on/off signal for at least 1.0 second. The overvoltage shutdown set point can be lowered by placing a resistor between the overvoltage trim (OVTRIM) pin and SENSE(–) pin. This feature is useful if the output voltage of the converter has been trimmed down and a corresponding reduction in overvoltage trip point is desired. The resistance required from a given overvoltage nom- inal set point is derived from the following equation: Where: Rov-adj is the value of an external resistor between the OVTRIM pin and SENSE(–) pin. Vov-set is the nominal adjusted set point of the overvolt- age shutdown threshold. VI(+) VI(–) ON/OFF CASE VO(+) VO(–) SENSE(+) TRIM SENSE(–) Radj-up RLOAD Radj-up VO 100 ∆% + () 1.225 ∆% -------------------------------------- 100 2 ∆% + () ∆% ---------------------------------- – k Ω = 246 8 1M % CHANGE IN OUTPUT VOLTAGE ( ∆%) 100k 100M 10 0 10M Rov-adj 17.6 2 Vov-set – Vov-set 17.6 – ---------------------------------------- k Ω = |
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