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PT4854 Datasheet(PDF) 2 Page - Texas Instruments |
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PT4854 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 Function 1+Vin 2–Vin 3 EN 1 4 EN 2 5 TEMP 6 Pin Not Present 7 Do Not Connect 8Vo1 Adjust 9+Vo1 PT4850 Series 25-A Triple Output Isolated DC/DC Converter For Logic Applications Pin Function 10 +Vo1 11 +Vo1 12 COM 13 COM 14 COM 15 +Vo2 16 +Vo2 17 Vo2 Adjust 18 COM On/Off Enable Logic Pin Configuration Pin Descriptions Pin 3 Pin 4 Output Status 1× Off 01 On ×0 Off Notes: Logic 1 =Open circuit 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, and EN 2 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 must be connected to –Vin to enable the module’s outputs. A high impedance disables the module’s outputs. EN 2: The positive logic input that activates the module output. If not used, this pin should be left open circuit. Connecting this input to –Vin disables the module’s outputs. 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. Vo 2: The regulated output that is designed to power logic circuitry. It is referenced to the COM node. Vo 3: The low-voltage regulated output that provides power for a µ-processor or DSP core, and is refer- enced 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. Vo(n) Adjust: Using a single resistor, this pin allows the associated output Vo(n) to be adjusted higher or lower than the preset value. If not used, this pin should be left open circuit. Vo(n) Rem Sense: An external remote sense input is provided for the two lowest voltage outputs, +Vo2 and +Vo3. Connecting the remote sense pins im- proves the load regulation of the applicable output by allowing the regulation circuit to compensate for voltage drop between the converter and load. If desired these inputs may be left disconnected. Note: Shaded functions indicate those pins that are at primary-side potential. Pin Function 19 COM 20 COM 21 Vo3 Adjust 22 +Vo3 23 +Vo3 24 Vo3 Rem Sense 25 Vo2 Rem Sense 26 Do Not Connect SLTS166C - FEBRUARY 2002 - REVISED MARCH 2003 Environmental Specifications Characteristics Symbols Conditions Min Typ Max Units Operating Temperature Range Ta Over Vin Range –40 — +85 (i) °C Case Temperature Tc — — 105 °C Storage Temperature Ts — –40 — +125 °C Over Temperature Protection OTP Case temperature — 110 125 °C Mechanical Shock Per Mil-STD-883D, Method 2002.3 — 500 — G’s 1 msec, ½ Sine, mounted Mechanical Vibration Mil-STD-883D, Method 2007.2 Suffix N — 10 (ii) — G’s 20-2000 Hz Suffix A, C — 20 (ii) — Weight — Vertical/Horizontal — 90 — grams Flammability — Meets UL 94V-O Notes: (i) See SOA curves or consult factory for appropriate derating. (ii) 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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