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UC1875-SP データシート(PDF) 5 Page - Texas Instruments |
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UC1875-SP データシート(HTML) 5 Page - Texas Instruments |
5 / 20 page -12 (DELAY) 62.5 x 10 I (DELAY) Delay set voltage R (9) Delay time can be programmed via resistors from the delay set pins to ground. Delay time = . Where I(DELAY) = . The Recommended range for I(DELAY) is 25 µA ≤ I(DELAY) ≤ 1 mA. UC1875-SP www.ti.com SLUSAQ9 – DECEMBER 2011 ELECTRICAL CHARACTERISTICS (continued) –55°C < TA < 125°C. VC = VIN = 12 V, R(FREQSET) = 12 kΩ, C(FREQSET) = 330 pF, R(SLOPE) = 12 kΩ, C(RAMP) = 200 pF, C(DELAYSET A-B) = C(DELAYSET C-D) = 0.01 µF, I(DELAYSET A-B) = I(DELAYSET C-D) = –500 µA, TA = TJ, unless otherwises stated. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Oscillator Initial accuracy TA = 25°C 0.85 1 1.19 MHz Voltage stability 11 V < VIN < 20 V 0.2% 2% Total variation Line, Temperature 0.8 1.2 MHz Sync pin threshold TJ = 25°C 3.8 Clock out peak TJ = 25°C 4.3 V Clock out low TJ = 25°C 3.3 Clock out pulse width R(CLOCKSYNC) = 3.9 kΩ 30 100 nsec Maximum frequency (7) R(FREQUEST) = 5 kΩ 2 MHz Ramp Generator/Slope Compensation Ramp current, minimum I(SLOPE) = 10 µA, V(FREQSET) = VREF –11 –14 µA Ramp current, maximum I(SLOPE) = 1 mA, V(FREQSET) = VREF –0.8 –0.95 mA Ramp valley 0 V Ramp peak - clamping level R(FREQSET) = 100 kΩ 3.8 4.1 5 V Current Limit Input bias VCS+ = 3 V 2 5 μA Threshold voltage 2.4 2.5 2.6 V Delay to output (8) 85 150 nsec Cycle-by-Cycle Current Limit Input bias VCS = 2.2 V 2 10 μA Threshold voltage 1.85 2 2.15 V Delay to output zero phase 110 300 ns Soft Start/Reset Delay Charge current V(SOFTSTART) = 0.5 V –20 –9 –3 μA Discharge current V(SOFTSTART) = 1 V 120 230 Restart threshold 4.3 4.7 V Discharge level 300 mV Output Drivers Output low level IOUT = 50 mA 0.2 0.4 V Output high level IOUT = –50 mA 1.5 2.5 Delay Set Delay set voltage I(DELAY) = –500 µA 2.3 2.4 2.6 V Delay time (8) I(DELAY) = –250 µA (9) 150 250 600 nsec (7) Not production tested at –55·C. (8) Not production tested. Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s): UC1875-SP |
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同様の説明 - UC1875-SP |
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