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PT4841N Datasheet(PDF) 2 Page - Texas Instruments |
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PT4841N Datasheet(HTML) 2 Page - Texas Instruments |
2 / 14 page For technical support and more information, see inside back cover or visit www.ti.com Pin Function 1+Vin 2–Vin 3 EN 1 4 EN 2 5 TEMP 6 Do Not Connect 7 Do Not Connect 8 Pin Not Present 9 Pin Not Present PT4840 Series—48V 65-W Triple Output Isolated DC/DC Converter for DSL Applications Pin Function 10 Pin Not Present 11 +Vo1 12 COM 13 COM 14 Pin Not Present 15+Vo2 16+Vo2 17Vo2 adjust Pin Function 18 COM 19 COM 20 COM 21Vo3 adjust 22 +Vo3 23 +Vo3 24 Pin Not Present 25 Do Not Connect 26 Do Not Connect On/Off Enable Logic Pin Configuration Pin Descriptions Pin 3 Pin 4 Output Status 1 × Off 01On × 0 Off 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. +Vin: The positive input supply for the module with respect to –Vin. When powering the module from a –48V 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, and TEMP inputs. When powering the module from a +48V supply, this input is connected to the 48V(Return). EN 1: The negative logic input that activates the module output. This pin is referenced to –Vin. A low-level voltage at this pin enables the module’s outputs, and a high impedance impedance disables the module’s outputs. If not used, the pin must be connected to –Vin. EN 2: The positive logic input that activates the module output. This pin is referenced to –Vin. A high impedance at this pin enables the module’s outputs. If not used, the pin should be left open circuit. TEMP: This pin produces an output signal that tracks a temperature that is approximately the module’s metal case. The output voltage is referenced to –Vin and rises approximately 10mV/°C from an intital value of 0.1VDC at –40°C. 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.) Vo 1: The highest regulated output voltage, which is referenced to the COM node. The output may be used to power analog support circuitry. Vo 2: The regulated output that is designed to power logic or I/O circuitry. It is referenced to the COM node. Vo 3: The low-voltage regulated output that provides power for a micro, processor, ASIC, or DSP core, and is referenced to the COM node. COM: The secondary return reference for the module’s three regulated output voltages. It is DC isolated from the input supply pins. 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. Vo3 Adjust: Using a single resistor, this pin allows Vo3 to be adjusted higher or lower than the preset value. If not used, this pin should be left open circuit. Note: Shaded functions indicate those pins that are at primary-side potential. SLTS142C - DECEMBER 2000 -REVISED SEPTEMBER 2002 Environmental Specifications Characteristics Symbols Conditions Min Typ Max Units Operating Temperature Range Ta Over Vin Range –40 — 85 (i) °C Over-Temperature Protection OTP Case temperature 100 — — °C Solder Reflow Temperature Treflow Surface temperature of module pins or case — — 215 (ii) °C Storage Temperature Ts — –40 — 125 °C Mechanical Shock Per Mil-STD-883D, Method 2002.3 1 msec, ½ Sine, mounted — 500 — G’s Mechanical Vibration Mil-STD-883D Method 2007.2 Suffix N — 10 (iii) — G’s 20-2000 Hz Suffix A, C — 20 (iii) — Weight — Vertical/Horizontal — 90 — grams Flammability — Meets UL 94V-O Notes: (i) See SOA curves or consult factory for appropriate derating. (ii) During solder reflow of SMD package version do not elevate the module case, pins, or internal component temperatures above a peak of 215°C. For further guidance refer to the application note, “Reflow Soldering Requirements for Plug-in Power Surface Mount Products,” (SLTA051). (iii) Only the case pins on through-hole pin configurations (N & A) must be soldered. For more information see the applicable package outline drawing. |
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