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ATH15T033-9J Datasheet(PDF) 8 Page - Astec America, Inc |
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ATH15T033-9J Datasheet(HTML) 8 Page - Astec America, Inc |
8 / 14 page Application Notes ATH Series of Wide-Output Adjust Power Modules (3.3/5-V Input) North America (USA): 1-888-41-ASTEC Europe (UK): 44(1384)842-211 Asia (HK): 852-2437-9662 Output On/Off Inhibit For applications requiring output voltage on/off control, each series of the ATH family incorporates an output Inhibit control pin. The inhibit feature can be used wher- ever 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 Vin with respect to GND. Figure 3-2 shows the typical application of the inhibit function. Note the discrete transistor (Q1). The Inhibit control has its own internal pull-up to Vin potential. The input is not compatible with TTL logic devices. An open- collector (or open-drain) discrete transistor is recommended for 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 will execute a soft-start power-up sequence. A regulated output voltage is produced within 20 msec. Figure 3-3 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, Q1 Vds. The waveforms were measured with a 5-A load. Figure 3-2 Figure 3-3 Vo (2V/Div) Iin (2A/Div) Q1Vds (5V/Div) HORIZ SCALE: 10ms/Div PTH05020W V IN 1 10 4 5 6 2 3 L O A D C IN 1,000 µF C OUT 330 µF 1 =Inhibit GND GND V OUT 9 V o Sense 8 Q 1 BSS138 R SET 7 Remote Sense The ATH10, ATH12/15, ATH18/22, and ATH26/30 products incorporate an output voltage sense pin, Vo Sense. The Vo Sense pin should be connected to Vout at the load circuit (see data sheet standard application). A re- mote sense improves the load regulation performance of the module by allowing it to compensate for any ‘IR’ voltage drop between itself and the load. An IR drop is caused by the high output current flowing through the small amount of pin and trace resistance. Use of the remote sense is optional. If not used, the Vo Sense pin can be left open-circuit. An internal low-value resistor (15- Ω or less) is connected between the Vo Sense and Vout. This en- sures the output voltage remains in regulation. With the sense pin connected, the difference between the voltage measured directly between the Vout and GND pins, and that measured from Vo Sense to GND, is the amount of IR drop being compensated by the regulator. This should be limited to a maximum of 0.3 V. Note: The remote sense feature is not designed to compensate for the forward drop of non-linear 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. Over-Temperature Protection The ATH18/22 and ATH26/30 series of products have over-temperature protection. These products have an on-board temperature sensor that protects the module’s internal circuitry against excessively high temperatures. A rise in the internal temperature may be the result of a drop in airflow, or a high ambient temperature. If the internal temperature exceeds the OTP threshold, the module’s Inhibit control is automatically pulled low. This turns the output off. The output voltage will drop as the external output capacitors are discharged by the load circuit. The recovery is automatic, and begins with a soft-start power up. It occurs when the the sensed tem- perature decreases by about 10 °C below the trip point. Note: The over-temperature protection is a last resort mecha- nism to prevent thermal stress to the regulator. Operation at or close to the thermal shutdown temperature is not recom- mended and will reduce the long-term reliability of the module. Always operate the regulator within the specified Safe Operating Area (SOA) limits for the worst-case conditions of ambient temperature and airflow. ATH15T05-9S |
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