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PTQA430033P2AD Datasheet(PDF) 9 Page - Texas Instruments |
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PTQA430033P2AD Datasheet(HTML) 9 Page - Texas Instruments |
9 / 16 page www.ti.com Differential Remote Sense Using the Remote On/Off Function on the PTQA4300xx Series of DC/DC Converters Negative Output Enable (NEN) PTQA430025, PTQA430033 SLTS261 – MAY 2006 The remote sense pins allows the converter to precisely regulate the DC output voltage at a remote location. This might be a power plane on an inner layer of the host PCB. Connecting Sense(+) directly to +VO, and Sense(–) to –VO will improve output voltage accuracy. In the event that the sense pins are left open-circuit, an internal 10- Ω resistor between each sense pin and its corresponding output prevents an excessive rise in the output voltage. For practical reasons, the amount of IR voltage compensation should be limited to 0.5 V maximum. The remote sense feature is designed to compensate for limited amounts of IR voltage drop. It is not intended to compensate for the forward drop of a non-linear or frequency dependent components that may be placed in series with the converter output. Examples of such components include OR-ing diodes, filter inductors, ferrite beads, and fuses. Enclosing these components with the remote sense connections effectively places them inside the regulation control loop, which can affect the stability of the regulator. For applications requiring output voltage On/Off control, the PTQA4300xx series of DC/DC converters incorporate a Remote On/Off control (pin 2). This feature can be used to switch the module off without removing the applied input source voltage. When placed in the Off state, the standby current drawn from the input source is typically reduced to 3 mA. Models using the negative enable option, the Remote On/Off (pin 2) control must be driven to a logic low voltage for the converter to produce an output. This is accomplished by either permanently connecting pin 2 to –VI (pin 3), or driving it low with an external control signal. Table 1 shows the input requirements of pin 2 for those modules with the NEN option. Table 1. On/Off Control Requirements for Negative Enable PARAMETER MIN TYP MAX VIH Enable 2.4 V 20 V VIL Disable –0.2 V 0.8 V Vo/c Open-Circuit 9 V 15 V II Pin 2 at –VI –0.75 mA 9 Submit Documentation Feedback |
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