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PTH08T230WAD Datasheet(PDF) 24 Page - Texas Instruments |
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PTH08T230WAD Datasheet(HTML) 24 Page - Texas Instruments |
24 / 36 page www.ti.com Output On/Off Inhibit PTH08T230W GND GND 3 10 Q1 BSS138 1=Inhibit Inhibit/ UVLO C I V I V I 2 t-Time=4ms/div I (1 A/div) I V (2V/div) O V (2V/div) INH Remote Sense PTH08T230W, PTH08T231W SLTS265F – NOVEMBER 2005 – REVISED MAY 2007 For applications requiring output voltage on/off control, the PTH08T230/231W incorporates an output Inhibit control pin. The inhibit feature can be used wherever there is a requirement for the output voltage from the regulator to be turned off. The power modules function normally when the Inhibit pin is left open-circuit, providing a regulated output whenever a valid source voltage is connected to VI with respect to GND. Figure 22 shows the typical application of the inhibit function. Note the discrete transistor (Q1). The Inhibit input has its own internal pull-up. An external pull-up should never be connected to the inhibit pin. The input is not compatible with TTL logic devices. An open-collector (or open-drain) discrete transistor is recommended for control. Figure 22. On/Off Inhibit Control Circuit Figure 23. Power-Up Response from Inhibit Control Turning Q1 on applies a low voltage to the Inhibit control pin and disables the output of the module. If Q1 is then turned off, the module executes a soft-start power-up sequence. A regulated output voltage is produced within 15 ms. Figure 23 shows the typical rise in both the output voltage and input current, following the turn-off of Q1. The turn off of Q1 corresponds to the rise in the waveform, VINH. The waveforms were measured with a 6-A constant current load. Differential remote sense improves the load regulation performance of the module by allowing it to compensate for any IR voltage drop between its output and the load in either the positive or return path. An IR drop is caused by the output current flowing through the small amount of pin and trace resistance. Connecting the +Sense (pin 5) and –Sense (pin 6) pins to the respective positive and ground reference of the load terminals improves the load regulation of the output voltage at the connection points. With the sense pins connected at the load, the difference between the voltage measured directly between the VO and GND pins, and that measured at the Sense pins, is the amount of IR drop being compensated by the regulator. This should be limited to a maximum of 300mV. If the remote sense feature is not used at the load, connect the +Sense pin to VO (pin4) and connect the –Sense pin to the module GND (pin 3). The remote sense feature is not designed to compensate for the forward drop of nonlinear or frequency dependent components that may be placed in series with the converter output. Examples include OR-ing diodes, filter inductors, ferrite beads, and fuses. When these components are enclosed by the remote sense connection they are effectively placed inside the regulation control loop, which can adversely affect the stability of the regulator. 24 Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Link(s): PTH08T230W PTH08T231W |
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