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LM5145 Datasheet(PDF) 7 Page - Texas Instruments |
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LM5145 Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 70 page  7.5 Electrical Characteristics (continued) TJ = –40°C to 125°C. Typical values are at TJ = 25°C and VIN = 12 V (unless otherwise noted). PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VOUT-3.3V-EXT 3.3-V output voltage setpoint RFB = 0 Ω, VIN = 3.8 V to 80 V, external compensation 3.267 3.3 3.33 V VOUT-5V–INT 5-V output voltage setpoint RFB = 24.9 kΩ, VIN = 5.5 V to 80 V, internal compensation 4.95 5.0 5.05 V VOUT-5V–EXT 5-V output voltage setpoint RFB = 24.9 kΩ, VIN = 5.5 V to 80 V, external compensation 4.95 5.0 5.05 V VOUT-12V-INT 12-V output setpoint RFB = 48.7 kΩ, VIN = 24 V to 80 V, internal compensation 11.88 12 12.12 V VOUT-12V-EXT 12-V output setpoint RFB = 48.7 kΩ, VIN = 24 V to 80 V, external compensation 11.88 12 12.12 V RFB-OPT1 5-V output select 23 25 27 kΩ RFB-OPT2 12-V output select 47 50 53 kΩ ERROR AMPLIFIER (COMP) gm-EXTERNAL EA transconductance, external compensation FB to COMP 1020 1200 µS gm-INTERNAL EA transconductance, internal compensation EXTCOMP 10 kΩ to VDDA 30 µS IFB Error amplifier input bias current 75 nA VCOMP-CLAMP COMP clamp voltage VFB = 0 V 2.1 V ICOMP-SRC EA source current VEXTCOMP = 1 V, VFB = 0.6 V 180 µA ICOMP-SINK EA sink current VEXTCOMP = 1 V, VFB = 1 V 180 µA RCOMP Internal compensation EXTCOMP 10 kΩ to VDDA 400 kΩ CCOMP Internal compensation EXTCOMP 10 kΩ to VDDA 50 pF CCOMP-HF Internal compensation EXTCOMP 10 kΩ to VDDA 1 pF PULSE FREQUENCY MODULATION (PFM/SYNC) VPFM-LO PFM detection threshold low 0.8 V VPFM-HI PFM decection threshold high 2.0 V VZC-SW Zero-cross threshold –5.5 mV VZC-DIS Zero-cross threshold disable PFM/SYNC = 0 V, 1000 SW cycles after first HO pulse 100 mV FSYNCIN Frequency sync range RRT = 9.52 kΩ, ±20% of the nominal oscillator frequency 1.74 2.7 MHz tSYNC-MIN Minimum pulse-width of external synchronization signal 20 250 ns tSYNCIN-HO Delay from PFM faling edge to HO rising edge 45 ns tPFM-FILTER SYNCIN to PFM mode 13 45 µs DUAL RANDOM SPREAD SPECTRUM (DRSS) ΔfC Switching frequency percentage change 7 % fm Modulation frequency 8.2 16.2 kHz SWITCHING FREQUENCY VRT RT pin regulation voltage 10 kΩ < RRT < 100 kΩ 0.5 V FSW1 Switching frequency 1 RRT = 97.6 kΩ to AGND 0.22 MHz FSW2 Switching frequency 2 VIN = 12 V, RRT = 9.52 kΩ to AGND 1.98 2.2 2.42 MHz FSW3 Switching frequency 3 RRT = 220 kΩ to AGND 100 kHz SLOPE1 Internal slope compensation 1 RRT = 9.52 kΩ 600 mV/µs SLOPE2 Internal slope compensation 2 RRT = 97.6 kΩ 50 mV/µs tON(min) Minimum on-time 50 ns tOFF(min) Minimum off-time 90 ns POWER GOOD (PG) VPG-UV Power Good UV trip level Falling with respect to the regulated voltage 90% 92% 94% VPG-OV Power Good OV trip level Rising with respect to the regulation voltage 108% 110% 112% www.ti.com LM5148 SNVSC01 – FEBRUARY 2023 Copyright © 2023 Texas Instruments Incorporated Submit Document Feedback 7 Product Folder Links: LM5148 |
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