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PTQA430025N2AD Datasheet(PDF) 6 Page - Texas Instruments |
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PTQA430025N2AD Datasheet(HTML) 6 Page - Texas Instruments |
6 / 18 page www.ti.com PIN DESCRIPTIONS Sense(+) +VO Adjust Sense(−) −VO PTQA430xxxN (Top View) +VI On/Off 1 2 3 −VI 5 6 7 4 8 PTQA430025, PTQA430033, PTQA420050 SLTS261A – MAY 2006 – REVISED DECEMBER 2006 +VI: The positive input for the module with respect to –VI. When powering the module from a –48-V telecom central office supply, this input is connected to the primary system ground. –VI: The negative input supply for the module, and the 0 VDC reference for the Remote On/Off input. When powering the module from a +48-V supply, this input is connected to the 48-V return. Remote On/Off: This input controls the On/Off status of the output voltage. It is either driven low (–VI potential), or left open-circuit. For units identified with the NEN option, applying a logic low to this pin will enable the output. And for units identified with the PEN option, the output will be disabled. VO Adjust: Allows the output voltage to be trimmed by up or down between +10% and –20% of its nominal value. The adjustment method uses a single external resistor. Connecting the resistor between VO Adjust and –VO adjusts the output voltage lower, and placing it between VO Adjust and +VO adjusts the output higher. The calculations for the resistance value follows industry standard formulas. For further information consult the application note on output voltage adustment. +VO: The positive power output with respect to –VO, which is DC isolated from the input supply pins. If a negative output voltage is desired, +VO should be connected to the secondary circuit common and the output taken from –VO. –VO: The negative power output with respect to +VO, which is DC isolated from the input supply pins. This output is normally connected to the secondary circuit common when a positive output voltage is desired. Sense(+): Provides the converter with an output sense capability to regulate the set-point voltage directly at the load. When used with Sense(-), the regulation circuitry will compensate for voltage drop between the converter and the load. The pin may be left open circuit, but connecting it to +VO will improve load regulation. Sense(–): Provides the converter with an output sense capability when used in conjunction with Sense(+) input. For optimum output voltage accuracy this pin should always be connected to –VO. 6 Submit Documentation Feedback |
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