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UC1844L883B Arkusz danych(PDF) 8 Page - Texas Instruments |
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UC1844L883B Arkusz danych(HTML) 8 Page - Texas Instruments |
8 / 56 page 8 UC1842, UC2842, UC3842, UC1843, UC2843, UC3843 UC1844, UC2844, UC3844, UC1845, UC2845, UC3845 SLUS223D – APRIL 1997 – REVISED AUGUST 2016 www.ti.com Product Folder Links: UC1842 UC2842 UC3842 UC1843 UC2843 UC3843 UC1844 UC2844 UC3844 UC1845 UC2845 UC3845 Submit Documentation Feedback Copyright © 1997–2016, Texas Instruments Incorporated Electrical Characteristics (continued) over operating free-air temperature range (unless otherwise noted) –55°C ≤ TA ≤ 125°C for the UC184x; –40°C ≤ TA ≤ 85°C for the UC284x, 0°C ≤ TA ≤ 70°C for the UC384x, VVCC = 15 V (1); 0.1 µF capacitor from VCC to GROUND, 0.1 µF capacitor from VREF to GROUND, RRT = 10 kΩ; CCT = 3.3 nF, TJ = TA. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT (5) Parameter measured at trip point of latch with VFB = 0 V. (6) Gain defined as: A = ΔVCOMP/ΔVISENSE, 0 V ≤ VISENSE ≤ 0.8 V. VCOMP High High-level output voltage VVFB = 2.3 V, RL = 15-kΩ COMP to GROUND 5 6 V VCOMP Low Low-level output voltage VVFB = 2.7 V, RL = 15-kΩ COMP to VREF 0.7 1.1 CURRENT SENSE SECTION ACS Gain See (5) (6) 2.85 3 3.15 V/V VISENSE Maximum input signal VCOMP = 5 V (5) 0.9 1 1.1 V PSRR Power supply rejection ratio 12 V ≤ VVCC ≤ 25 V (2) (5) 70 dB IISENSE Input bias current –2 –10 µA tDLY Delay to output VISENSE stepped from 0 V to 2 V (2) 150 300 ns OUTPUT SECTION VOUT Low Low-level OUTPUT voltage ISINK = 20 mA 0.1 0.4 V ISINK = 200 mA 1.5 2.2 VOUT High High-level OUTPUT voltage ISOURCE = 20 mA 13 13.5 V ISOURCE = 200 mA 12 13.5 tRISE Rise time (2) COUTPUT = 1 nF, TJ = 25°C 50 150 ns tFALL Fall time (2) COUTPUT = 1 nF, TJ = 25°C, 50 150 ns UNDERVOLTAGE LOCKOUT (UVLO) VCCON Enable threshold UCx842/4 UC184x and UC284x 15 16 17 V UCx843/5 UC384x 14.5 16 17.5 UCx843/5 7.8 8.4 9 VCCOFF UVLO off threshold UCx842/4 UC184x and UC284x 9 10 11 V UCx843/5 UC384x 8.5 10 11.5 UCx843/5 7 7.6 8.2 PWM DMAX Maximum duty cycle UCx842/3 95% 97% 100% UCx844/5 UC184x and UC284x 46% 48% 50% UC384x 47% 48% 50% DMIN Minimum duty cycle 0% TOTAL STANDBY CURRENT IVCC Start-up current 0.5 1 mA IVCC Operating supply current VVFB = VISENSE= 0 V 11 17 VCC Zener voltage IVCC = 25 mA 30 34 V |
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