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LM5145 Datasheet(PDF) 9 Page - Texas Instruments |
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LM5145 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 60 page  7.5 Electrical Characteristics (continued) Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over the –40°C to 150°C junction temperature range unless otherwise stated. VVIN = 48 V, VEN/UVLO = 1.5 V, RRT = 25 kΩ unless otherwise stated PARAMETER TEST CONDITIONS MIN TYP MAX UNIT RLO-UP LO high state resistance, LO to VCC VBST – VSW = 7 V, ILO = –100 mA 1.5 Ω RLO-DOWN LO low state resistance, LO to PGND VBST – VSW = 7 V, ILO = 100 mA 0.9 Ω IHOH, ILOH HO, LO source current VBST – VSW = 7 V, HO = SW, LO = AGND 2.3 A IHOL, ILOL HO, LO sink current VBST – VSW = 7 V, HO = BST, LO = VCC 3.5 A THO-TR, TLO- TR HO, LO rise times VBST – VSW = 7 V, CLOAD = 1 nF, 20% to 80% 7 ns THO-TF, TLO- TF HO, LO fall times VBST – VSW = 7 V, CLOAD = 1 nF, 80% to 20% 4 ns THO-DT HO turn-on deadtime VBST – VSW = 7 V, 50% to 50% 14 ns TLO-DT LO turn-on deadtime VBST – VSW = 7 V, 50% to 50% 14 ns BOOTSTRAP DIODE AND UNDER-VOLTAGE THRESHOLD VBST-FWD VCC to BST VCC to BST, BST pin sourcing 20 mA 0.75 0.9 V IQ-BST BST to SW quiescent current, not switching VSS/TRK = 0 V, VSW = 48 V, VBST = 54 V 80 µA VBST-UV BST to SW undervoltage detection VBST – VSW falling 3.4 V VBST-HYS BST to SW undervoltage hysteresis VBST – VSW rising 0.42 V PWM CONTROL TON(min) Minimum controllable on-time VBST – VSW = 7 V, HO 50% to 50% 45 ns TOFF(min) Minimum off-time VBST – VSW = 7 V, HO 50% to 50% 145 ns DC100KHz Maximum duty cycle FSW = 100 kHz, 5.5 V < VVIN < 60 V 98 99 % DC400kHz FSW = 400 kHz, 5.5 V < VVIN < 60 V 90 94 % VRAMP(min) RAMP valley voltage (COMP at 0% duty cycle) 300 mV kFF PWM feedforward gain (VIN / VRAMP) 5.5 V < VVIN < 100 V 15 V / V OVER CURRENT PROTECT (OCP) - VALLEY CURRENT LIMITING IRS ILIM source current, RSENSE Mode Low voltage detected at ILIM 100 µA IRDSON ILIM source current, RDS-ON mode SW voltage detected at ILIM , TJ = 25°C 180 200 220 µA IRSTC ILIM current tempco RDS-ON mode 4500 ppm/°C IRDSONTC ILIM current tempco RSENSE mode 0 ppm/°C VILIM-TH ILIM comparator threshold at ILIM –8 –2 3.5 mV SHORT CIRCUIT PROTECTION (SCP) - DUTY CYCLE CLAMP VCLAMP-OS Clamp offset voltage - No current limiting COMP to duty cycle clamp voltage 0.2 + VVIN/75 V VCLAMP-MIN Minimum duty cycle clamp voltage Clamp voltage with continuous OCP 0.3 + VVIN/150 V HICCUP MODE FAULT PROTECTION CHICC-DEL Hiccup mode activation delay Clock cycles with current limiting before off-time activated 128 cycles CHICCUP Hiccup mode off time after activation Clock cycles with no switching followed by SS/TRK release 8192 cycles DIODE EMULATION / DCM OPERATION VZCD-SS Zero-cross detect (ZCD) soft-start ramp ZCD threshold measured at SW pin 50 cycles after first HO pulse 0 mV VZCD-DIS Zero-cross detect disable threshold ZCD threshold measured at SW pin 1000 cycles after first HO pulse 200 mV www.ti.com LV5144 SNVSCJ1 – AUGUST 2023 Copyright © 2023 Texas Instruments Incorporated Submit Document Feedback 9 Product Folder Links: LV5144 |
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