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PTN78020AAZ Datasheet(PDF) 3 Page - Texas Instruments |
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PTN78020AAZ Datasheet(HTML) 3 Page - Texas Instruments |
3 / 19 page www.ti.com ELECTRICAL CHARACTERISTICS PTN78020A SLTS244A – APRIL 2005 – REVISED MAY 2005 operating at 25°C free-air temperature, V I = 20 V, VO = –5 V, IO = IO (max), CI = 100 µF and 4x 4.7 µF, CO = 100 µF (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VO = -3 V 0.1 4 (1) VO = -5 V 0.1 4 (1) TA = 25°C, natural convec- IO Output current A tion airflow VO = -12 V 0.1 2.1 (1) VO = -15 V 0.1 1.67 (1) VO = -3 V 9 29 (2) VO = -5 V 9 27 (2) VI Input voltage range Over IO range V VO = -12 V 9 20 (2) VO = -15 V 9 17 (2) Set-point voltage tolerance TA = 25°C ±2%(3) Temperature variation -40°C to +85°C -0.5% Line regulation Over VI range -10 mV VO Load regulation Over IO range -10 mV Includes set point, line, load Total output voltage variation -3% (3) -40 < TA < 85°C VO (adj) Output voltage adjust range 9 V ≤ V I ≤ (32 – |VO|) V -15 - 3 V VI = 12 V, RSET = 100 Ω, VO = –15 V 87% VI = 12 V, RSET = 2 kΩ, VO = –12 V 86% η Efficiency VI = 20 V, RSET = 28.7 kΩ, VO = –5 V 82% VI = 24 V, RSET = 221 kΩ, VO = –3.3 V 77% Output voltage ripple 20-MHz bandwidth 1% VO V(PP) IO (LIM) Current limit threshold ∆V O = –50 mV 8.5 A 1 A/µs load step from 50% to 100% IOmax Transient response Recovery time 200 µs VO over/undershoot 5 %VO FS Switching frequency Over VI and IO ranges 440 550 660 kHz UVLO Undervoltage lockout VI increasing 5.5 V Ceramic 18.8 (4) CI External input capacitance µF Nonceramic 100 (4) Ceramic 200 µF CO External output capacitance Nonceramic 100 (5) 2,000 Equivalent series resistance (nonceramic) 10 (6) m Ω Per Telcordia SR-332, 50% stress, MTBF Calculated reliability 5.6 106 Hrs TA = 40°C, ground benign (1) The maximum output current is 4 A, or a maximum output power of 25 W, whichever is less. (2) The maximum input voltage is limited and defined to be (32 – |VO|) volts. (3) 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 or better temperature stability. (4) A minimum 100-µF electrolytic and four 4.7-µF ceramic capacitors are required across the input (VI and GND) for proper operation. Locate the ceramic capacitors close to the module. (5) 100 µF of output capacitance is required for proper operation. See the application information for further guidance. (6) This is the typical ESR for all the electrolytic (nonceramic) capacitance. Use 17 m Ω as the minimum when using max-ESR values to calculate. 3 |
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