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PTB48560AAZ Datasheet(PDF) 4 Page - Texas Instruments |
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PTB48560AAZ Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 28 page  www.ti.com PTB48560B ELECTRICAL CHARACTERISTICS PTB48560A, PTB48560B PTB48560C SLTS236A–MARCH 2005–REVISED OCTOBER 2005 (Unless otherwise stated, TA = 25°C, VI =48V,VO = 3.3 V, CO = 220 µF, and IO =IOmax) PTB48560B PARAMETER TEST CONDITIONS UNIT MIN TYP MAX Over VI range IO Bus 0.25 (1) 8 (2) IO Output current IO Seq 0 4 (3) A Sum total, (IO Bus+IO Seq) 0.25 8 VI Input voltage range Over IO range 36 48 75 V Set-point voltage tolerance ±1 (4) %VO Temperature variation -40°C ≤ TA ≤ 85°C ±0.5 %VO Line regulation Over VI range ±7 ±33 mV VO Load regulation Over IO range ±13 ±33 mV Total output voltage variation Includes set-point, line, load, –40°C ≤ TA ≤ 85°C ±2 ±3 (4) %VO Adjust range Over VI range 1.8 3.6 V RSET =5.36kΩ,VO = 3.3 V 82% η Efficiency RSET = 40.2 kΩ,VO = 2.5 V 79% RSET = open , VO = 1.8 V 74% VO Ripple (peak-to-peak) 20-MHz bandwidth 50 mVpp 0.1 A/µs load step, Recovery time 100 µs Transient response 50% to 100% VO over/undershoot ±150 mV IOmax Input current Track connected to -Sense -0.13 mA Track input (pin 5) Open-circuit voltage 0 VO Bus Input slew rate limits 0.1 (5) 1V/ms Referenced to -VI Input high voltage (VIH) 2 Open (6) V Output enable inputs (pins 2, 3) Input low voltage (VIL)-0.2 0.8 Input low current (IIL)0.48 mA Standby input current Pins 2 and 3 open 8 16 mA IO (tot) Overcurrent threshold Shutdown, followed by autorecovery 12 A VI increasing 34 UVLO Undervoltage lockout V VI decreasing 33 ƒS Switching frequency Over VI range 400 500 600 kHz Internal input capacitance 1µF External output capacitance Between both outputs and VO COM 220 5,000 µF Isolation voltage Input-output 1,500 Vdc Isolation capacitance Input-output 2,000 pF Isolation resistance Input-output 10 MΩ Telcordia SR-332 50% stress, TA = 40°C, ground MTBF Reliability 3.6 106 Hr benign (1) The converter requires a minimum load current at either the VO Seq or VO Bus output for proper operation. The converter is not damaged when operated under a no-load condition. (2) See temperature derating curves for safe operating area (SOA), to determine output current derating at elevated ambient temperatures. (3) When load current is supplied from the VO Seq output, the module exhibits higher power dissipation and slightly lower operating efficiency. (4) The set-point voltage tolerance is affected by the tolerance and stability of RSET. The stated limit is unconditionally met if RSET has a tolerance of 1%, with 100 ppm/°C temperature stability. (5) When controlling the Track input from an external source, the slew rate of the applied signal must be greater than the minimum limit. Failure to allow the voltage to completely rise to the voltage at the VO (bus) output, at no less than the minimum specified rate, may thermally overstress the converter. (6) The PEN and NEN inputs each have an internal pullup resistor. If the enable feature is not used, the PEN input (pin 2) should be left open circuit and the NEN input (pin 3) permanently connected to –VI. A discrete MOSFET or bipolar transistor is recommended for the enable control. The open-circuit voltage is less than 10 V. See the Application Information for a more detailed description. 4 |
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