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PT4822A Datasheet(PDF) 7 Page - Texas Instruments |
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PT4822A Datasheet(HTML) 7 Page - Texas Instruments |
7 / 34 page For technical support and more information, see inside back cover or visit www.ti.com 7 SLTS165E - FEBRUARY 2002 - REVISED MARCH 2003 PT4823—48V 35-W Triple Output Isolated DC/DC Converter for Logic Applications PT4823 Electrical Specifications (Unless otherwise stated, the operating conditions are: Ta =25°C, Vin =48V, and Io =0.5Iomax) PT4823 Characteristics Symbols Conditions Min Typ Max Units Output Current Io Each output Io1 (3.3V) 0.25 (1) —8 (2) Io2 (2.5V) 0.1 (1) —6 (2) A Io3 (1.2V) 0.1 (1) —6 (2) Total (Io1 + Io2 + Io3) ——12 (2) A Input Voltage Range Vin Continuous 36 — 75 V Surge (1 minute) — — 80 Set-Point Voltage Vo Vo1 3.24 3.3 3.36 Vo2 2.45 2.5 2.55 V Vo3 1.17 1.2 1.23 Temperature Variation Regtemp –40°C ≤Ta ≤+85°C, Io =Iomin Vo1 — ±0.5 — %Vo Vo2/Vo3 — ±0.5 — Line Regulation Regline All outputs, Over Vin range — ±0.1 ±0.5 %Vo Load Regulation Regload All outputs, 0 ≤Io≤Iomax — ±0.1 ±0.5 %Vo Total Output Voltage Variation ∆Votol Includes set-point, line, load, Vo1 — — ±3 (3) %Vo –40°C ≤Ta ≤+85°C Vo2/Vo3 — — ±3 (3) Efficiency η Io1 =6A, Io2 =2A, Io3 =2A — 85.6 — % Vo Ripple/Noise Vn Vo1 —35 — (0 to 20MHz bandwidth) Vo2 —25 — mVpp Vo3 —25 — Transient Response ttr 0.1A/µs load step, 50% to 75% Iomax — 200 — µSec Vos Vo over/undershoot — 3 — %Vo Output Adjust Range Voadj Vo1/Vo2/Vo3 — ±10 — %Vo Over-Current Threshold ITRIP Total, all outputs. Reset with auto-recovery — 14 — A Switching Frequency ƒs Over Vin and Io ranges 350 400 450 kHz Under Voltage Lockout Von Vin increasing — 35.5 — V Voff Vin decreasing — 34 — Turn-On Time ton Vin =48V step — 140 (4) —ms Enable Control (pins 1 & 2) Referenced to –Vin (pin 4) High-Level Input Voltage VIH 4 — 15 (5) V Low-Level Input Voltage VIL –0.2 — 0.8 Low-Level Input Current IIL — 12mA Standby Input Current Iin standby pins 1 & 2 open circuit — 1 5 mA Internal Input Capacitance Cint — 1.14 — µF External Output Capacitance Co1 0 220 1,000 (6) Co2 0 220 1,000 (6) µF Co3 0 220 1,000 (6) Primary/Secondary Isolation V iso 1500 — — V C iso — 2,200 — pF R iso 10 ——M Ω Notes: (1) The converter will operate down to no load with reduced specifications. (2) The sum-total current from outputs Vo1, Vo2, and Vo3 cannot exceed 12ADC. (3) Limits are specified by design. (4) Measured from the application of the input voltage to the instance that all outputs are in regulation. (5) The Enable inputs (pins 1 & 2) have internal pull-ups. Leaving pin 1 open-circuit and connecting pin 2 to –Vin allows the the converter to operate when input power is applied. The maximum open-circuit voltage is 4V. (6) Ultra-low ESR capacitors, such as organic or polymer aluminum electrolytic types, may cause instability. Consult the factory before using. |
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