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PT4841A Datasheet(PDF) 3 Page - Texas Instruments |
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PT4841A Datasheet(HTML) 3 Page - Texas Instruments |
3 / 14 page For technical support and more information, see inside back cover or visit www.ti.com PT4841—48V 65-W Triple Output Isolated DC/DC Converter for DSL Applications PT4841 Electrical Specifications (Unless otherwise stated, the operating conditions are:- Ta =25°C, Vin =48V, and Ion =0.5Ionmax) PT4841 Characteristics Symbols Conditions Min Typ Max Units Output Power Po Each output: Vo1 ( 15V) — — 41 (1) Vo2 (3.3V) — — 20 (1) W Vo3 (1.5V) — — 10.5 (1) Total (all three outputs) — — 65 (1) W Output Current Io Io1 ( 15V) 0 — 2.7 Io2 (3.3V) 0 — 6 (2) A Io3 (1.5V) 0 — 7 (2) Maximum (Io2 + Io3) ——11 (2) A Input Voltage Range Vin 36 — 75 V Set-Point Voltage Vo Vo1 — 15.2 — Vo2 — 3.3 — V Vo3 —1.5 — Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Vo1 — ±0.5 — %Vo Vo2/Vo3 — ±0.8 — Line Regulation Regline All outputs, Over Vin range — 0.10.5 %Vo Load Regulation Regload All outputs, 0 ≤Io≤Iomax — 0.2 0.5 %Vo Cross Regulation Regcross Any one output vs. other outputs — — 1.0 %Vo Total Output Voltage Variation ∆Votol Includes set-point, line, load, Vo1 15 — 15.75 (3) –40°C ≤Ta ≤+85°C Vo2 3.2 — 3.4 (3) V Vo3 1.45 — 1.55 (3) Efficiency η Po =Pomax — 85 — % Vo Ripple/Noise Vn Co1/Co2/Co3 =10µF Vo1 —50 100 (4) (0 to 20MHz bandwidth) Vo2 —20 50 (4) mVpp Vo3 —20 50 (4) Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — 30 — µSec Vos Vo over/undershoot — 5 — %Vo Output Adjust Range Voadj Vo2 / Vo3 ±10 ——%Vo Current Limit Threshold ILIM Io1 —4 — A Io2 + Io3 —16 — Over Current Shutdown Delay tsd Time period prior to latched shutdown — 200 (5) —ms Switching Frequency ƒs Over Vin and Io ranges 450 500 550 kHz Under Voltage Lockout Von Vin increasing — 34 — V Voff Vin decreasing — 32 — Enable Control (pins 2 & 3) Referenced to –Vin (pin 2) High-Level Input Voltage VIH 4.0 — 70 (6) V Low-Level Input Voltage VIL –0.2 — 0.8 (6) Low-Level Input Current IIL Vin =75V — 0.16 0.25 mA Standby Input Current Iin standby pins 2 & 4 connected — 8 10 (3) mA Internal Input Capacitance Cint —2 —µF External Output Capacitance Co1 0 — 330 (7) Co2 0 — 5,000 (7) µF Co3 0 — 10,000 (7) Temperature Sense Vtemp Output voltage at temperatures:- –40°C — 0.1 (8) — V 100°C — 1.5 (8) — Primary/Secondary Isolation V iso 1500 — — V C iso —1500 —pF R iso 10 ——M Ω Notes: (1) The sum total power delivered from all three regulated outputs, Vo1, Vo2, and Vo3, cannot exceed 65 watts. (2) The sum-total current from outputs Vo2, and Vo3 cannot exceed 11ADC. (3) Limits are guaranteed by design. (4) The ripple and noise is measured with a 10µF tantalum capacitor across each output. (5) After latched shutdown, the module may be reset cycling the input power. (6) The Enable inputs (pins 3 & 4) have internal pull-ups. Leaving pin 4 open-circuit and connecting pin 3 to –Vin allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 5.1V. (7) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. For more information refer to the application note regarding capacitor selection. (8) Voltage output at “TEMP” pin is defined by the equation:- VTEMP = 0.5 + 0.01·T, where T is the sensed temperature in degrees centigrade. See pin descriptions for more information. SLTS142C - DECEMBER 2000 -REVISED SEPTEMBER 2002 |
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