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PT4668 Datasheet(PDF) 2 Page - Texas Instruments |
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PT4668 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 13 page For technical support and more information, see inside back cover or visit www.ti.com Pin Descriptions +Vin: The positive input supply for the module with respect to –Vin. If powering the module from a -24V telecom central office supply, this input is connected to the primary system ground. –Vin: The negative input supply for the module, and the 0VDC reference for the EN 1, EN 2, TEMP, and AUX signals. When the module is powered from a +24V supply, this input is connected to the 24V Return. EN 1: The negative logic input that enables the module output. This pin is TTL compatible and referenced to –Vin. A logic ‘0’ at this pin enables the module’s outputs. A logic ‘1’ or high impedance disables the module’s outputs. If not used, the pin must be connected to –Vin. EN 2: The positive logic input that enables the module output. This pin is TTL compatible and referenced to –Vin. A logic ‘1’ or high impedance enables the module’s outputs. If not used, the pin should be left open circuit. TEMP: This pin produces an output signal that tracks the module’s metal case temperature. The output voltage is referenced to –Vin and rises approximately 10mV/°C from an intital value of 0.1VDC at -40°C (VTemp =0.5 + 0.01·TCase). The signal is available whenever the module is supplied with a valid input voltage, and is independant of the enable logic status. (Note: A load impedance of less than 1M Ω will adversly affect the module’s over-temperature shutdown threshold. Use a high-impedance input when monitoring this signal.) AUX: Produces a regulated output voltage of 11.6V ±5%, which is referenced to –Vin. The current drawn from the pin must be limited to 10mA. The voltage may be used to indicate the output status of the module to a primary referenced circuit, or power a low-current amplifer. Vo1: The higher regulated output voltage, which is referenced to the COM node. Vo2: The lower regulated output voltage, which is referenced to the COM node. COM: The secondary return reference for the module’s two regulated output voltages. It is DC isolated from the input supply pins. Vo1 Adjust: Using a single resistor, this pin allows Vo1 to be adjusted higher or lower than the preset value. If not used, this pin should be left open circuit. Vo2 Adjust: Using a single resistor, this pin allows Vo2 to be adjusted higher or lower than the preset value. If not used, this pin should be left open circuit. On/Off Logic Pin 3 Pin 4 Output Status 1 × Off 01 On × 0 Off Pin-Out Information Pin Function 1+Vin 2-Vin 3 EN 1 4 EN 2 5 TEMP 6 AUX 7 Do Not Connect 8 Do Not Connect 9+Vo1 Pin Function 10 +Vo1 11 +Vo1 12 +Vo1 13 Vo1 Adjust 14 COM 15 COM 16 COM 17 COM 18 COM Notes: Logic 1 =Open collector Logic 0 = –Vin (pin 2) potential For positive Enable function, connect pin 3 to pin 2 and use pin 4. For negative Enable function, leave pin 4 open and use pin 3. Note: Shaded functions indicate signals that are referenced to the input (-Vin) potential. Pin Function 19 COM 20 Vo2 Adjust 21 +Vo 2 22 +Vo 2 23 +Vo 2 24 +Vo 2 25 Do Not Connect 26 Do Not Connect PT4680 Series 20-A 24-V Input Dual Output Isolated DC/DC Converter |
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