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UC2827N-2 Datasheet(PDF) 6 Page - Texas Instruments |
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UC2827N-2 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 15 page www.ti.com UC1827-1, UC1827-2 UC2827-1, UC2827-2 UC3827-1, UC3827-2 SLUS365A – APRIL 1999 – REVISED AUGUST 2005 ELECTRICAL CHARACTERISTICS (continued) Unless otherwise spsecified, V VCC = 15 V, VV+ = 14.3 V, CCT = 340 pF, RRT = 10 kΩ, RDELAY = 24.3 kΩ, VSRC = VGND = VBUCK= V PUSH = VPULL outputs no load, TJ = TA PARAMETER TEST CONDITIONS MIN TYP MAX UNIT GBW(1) Gain bandwidth At 100 kHz, Measure Gain 2 4.5 MHz VOL ICEAO = 0 µA (No Load) 0.25 0.5 V VOH ICEAO = 0 µA (No Load) 3.3 3.5 V CMRR Common mode range(1) -0.3 5 V OSCILLATOR SECTION fOSC Frequency 180 220 250 kHz ICT(dsch) CT discharge current 3.5V at CT when CT removed 5 mA PWM COMPARATOR DMAX Minimum duty cycle 200 kHz 0% DMAX Maximum duty cycle 200 kHz 85% 91% 95% BUCK OUTPUT STAGE tRISE Rise time 1 nF Load(2) 40 100 ns tFALL Fall tIme 1 nF, Load 30 80 ns IBUCK = –15 mA , V+ –BUCK(3) 1.5 2.5 V VOH High-level output voltage IBUCK = –150 mA, V+ –BUCK (3) 2 2.5 V IBUCK = 15 mA(4) 0.2 0.4 V VOL Low-level output voltage IBUCK = 150 mA (4) 0.7 1.2 V PUSH/PULL OUTPUT STAGES tRISE Rise time 1 nF load 50 100 ns tFALL Fall tIme 1 nF load 35 100 ns Overlap time UCx827-1 1 nF loads(5) 100 250 400 ns Nonoverlapping time (6) UCx827-2 100 250 500 ns IPUSH/PULL = –10 mA, VCC – PUSH 2 3 V (7) VOH High-level output voltage IPUSH/PULL = –100 mA, VCC – 2.5 3 V PUSH(7) IPUSH/PULL = 10 mA(7) 0.2 0.8 V VOL Low-level output voltage IPUSH/PULL = 100 mA(7) 0.6 1.2 V REFERENCE Reference voltage 4.8 5 5.2 V ISC Shor-circuit current VREF = 0V –35 –50 –65 mA Line regulation 0.5V < VVCC < 20 V 5 20 mV Load regulation 0 mA < IIO < 10 mA 8 20 mV SOFT START VOL Low-level output voltage saturation VVCC = 7 V 250 500 mV ISS Soft-start current –5 –12 –25 µA (2) Measure the rise time from when BUCK crosses 1 V until it crosses 9 V. (3) To force BUCK high, force VCSAO=2.5 V, VCEAO = 2.5 V, a 25-kΩ pulldown resistor from RAMP to ground, and VCT = 0.5 V. (4) To force BUCK low, force VCSAO = 2.5 V, VCEAO = 2.5 V, a 10-kΩ pulldown resistor from RAMP to ground, and VCT = 3.5 V. (5) The overlap time is measured from the point at which the rising edge of PUSH/PULL crosses 5 V until the falling edge of PULL/PUSH crosses 5V. (6) The non-overlap time is measured from the point at which the falling edge of PUSH/PULL crosses 5 V until the rising edge of PULL/PUSH crosses 5 V. (7) To toggle PUSH or PULL into a desired state, pulse CT from 0.5 V to 3.5 V. PUSH and PULL toggle on the rising edge of CT. 6 |
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