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LM5145 Datasheet(PDF) 11 Page - Texas Instruments |
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LM5145 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 73 page  6.5 Electrical Characteristics (continued) Typical values are at TJ = 25°C. Minimum and maximum limits apply at TJ = –40°C to 150°C. VIN = 12V, unless otherwise stated. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VZC-SW Zero-cross detection threshold –5.5 mV FSYNCIN Frequency synchronization range RRT = 10kΩ, ±20% of the nominal oscillator frequency 1760 2640 kHz tSYNC-MIN Minimum pulsewidth of external synchronization 20 ns tSYNCIN-HO Delay from PFM/SYNC rising edge to HO1 rising edge 90 ns tPFM-FILTER SYNCIN to PFM mode 14 70 µs BOOTSTRAP CIRCUIT (CBOOT1, CBOOT2) VBOOT1/2-DROP Internal diode forward drop ICBOOT1/2 = 20mA, VCC to CBOOT1/2 0.8 V IBOOT1/2 CBOOT-to-SW quiescent current, not switching VEN1/2 = 5V, VCBOOT1/2 – VSW1/2 = 5V 2 µA VBOOT1/2-SW-UV-R CBOOT-to-SW UVLO rising threshold VCBOOT1/2 – VSW1/2 rising 2.7 V VBOOT1/2-SW-UV-F CBOOT-to-SW UVLO falling threshold VCBOOT1/2 – VSW1/2 falling 2.47 V VCHARGE–PUMP1/2- UNLOADED Charge pump output voltage ICBOOT1/2 = 0µA 4.8 V ICHARGE–PUMP1/2 Charge pump output current VCBOOT1/2 = 3.5V 20 µA HIGH-SIDE GATE DRIVER (HO1, HO2) VHO1/2-HIGH HO1/2 high-state output voltage IHO1/2 = –100mA 95 mV VHO1/2-LOW HO1/2 low-state output voltage IHO1/2 = 100mA 43 mV IHO1/2-SRC HO1/2 peak source current VHO1/2 = VSW1/2 = 0V 2 A IHO1/2-SINK HO1/2 peak sink current VCBOOT1/2 – VSW1/2 = 5V 3 A LOW-SIDE GATE DRIVER (LO1, LO2) VLO1/2-HIGH LO1/2 high-state output voltage ILO1/2 = –100mA 100 mV VLO1/2-LOW LO1/2 low-state output voltage ILO1/2 = 100mA 58 mV ILO1/2-SRC LO1/2 peak source current VLO1/2 = 0V 2 A ILO1/2-SINK LO1/2 peak sink current VVCC = 5V 3 A ADAPTIVE DEADTIME CONTROL tDEAD1 HO1/2 off to LO1/2 deadtime 20 ns tDEAD2 LO1/2 off to HO1/2 on deadtime 20 ns START-UP (RSS) RSS1 1.5ms soft-start time RSS1 = 0Ω 1.5 ms RSS2 2ms soft-start time RSS2 = 8.06kΩ 2 ms RSS3 20ms soft-start time RSS3 = 95.3kΩ 20 ms DUAL RANDOM SPREAD SPECTURM (DRSS) fm Modulation frequency 7.2 12 16.8 kHz ΔfSS1/2-LF Low-frequency triangular spread spectrum modulation range1 maximum RCNFG = 19.1kΩ or 54.9kΩ –5 5 % ΔfSS2-LF Low-frequency triangular spread spectrum modulation range2 maximum RCNFG = 29.4kΩ or 71.5kΩ –10 10 % OVERCURRENT PROTECTION (ISNS1+, ISNS2+) VCS1/2-TH Current limit threshold Measured from ISNS1/2+ to VOUT1/2 54 60 66 mV tDELAY1/2-ISNS+ ISNS+ delay from VCS-TH to HO off 48 ns GCS1/2 CS amplifier gain 9.5 10 10.5 V/V VCS-SHARE COMP to current accuracy VCOMP1/2 = 1.2V 54 60 66 mV INTERNAL HICCUP MODE HICDLY Hiccup-mode activation delay VISNS1/2+ – VVOUT1/2 > 60mV 512 cycles HICTIME Hiccup-mode duration VISNS1/2+ – VVOUT1/2 > 60mV 16384 cycles THERMAL SHUTDOWN TSHD Thermal shutdown threshold Temperature rising 175 °C www.ti.com LM25137 SNVSCU4 – OCTOBER 2025 Copyright © 2025 Texas Instruments Incorporated Submit Document Feedback 11 Product Folder Links: LM25137 |
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