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LM3754 Scheda tecnica(PDF) 7 Page - Texas Instruments |
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LM3754 Scheda tecnica(HTML) 7 Page - Texas Instruments |
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7 / 47 page  LM3754 www.ti.com SNVS789B – JANUARY 2012 – REVISED APRIL 2013 Electrical Characteristics (continued) Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of −5°C to +125°C. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated VVIN = 12V, VVDD = 5V, VVCC = internal LDO, VEN = 2V, RFRQ = 78.7 kΩ, VPH = 0V, VCS1 = VCS2 = VCSM = VSS = VSNSP = 1.8V, VILIM − VCSM = 100 mV, VSNSM = VSYNC = 0V, VSYNCOUT floating. Symbol Parameter Conditions Min Typ Max Units Differential Amplifier: SNSP, SNSM, VDIF VOS-INPUT Input Offset Voltage VSNSP = 1.8V 3 mV RINPUT-SNSP Input Resistance of SNSP 30 k Ω AV-DIF Gain VSNSP = 0.6V to 3.6V 0.996 1 1.004 V/V fBW-DIF 3dB Bandwidth 2 MHz VDIF-REG1 VDIF Load Regulation, Sourcing VVDIF = 3.6V, IVDIF = 0.5 mA −3 mV VDIF-REG2 VDIF Load Regulation, Sourcing VVDIF = 0.6V, IVDIF = 0.5 mA −3 mV Current-Sense, Current Limit and Hiccup Mode: CS1, CS2, CSM, ILIM VCS-OS Current-Sense Input Offset VOUT = 1.8V ±2 mV Voltage Range, VCS1(2) – VCSM ICS CS1, CS2 Input Bias Current VCSM = 3.6V, VCS1(2) − VCSM = −15 mV and −200 200 nA +40 mV VCSM = 0.6V, VCS1(2) − VCSM = −15 mV and −450 450 nA +40 mV ICSM CSM Input Source Bias Current VCSM = 0.6V and 3.6V, VCS1(2) − VCSM = 40 150 240 µA mV ICSL CS1+ CS2 + CSM + ILIM VVCC = 0V, VEN = 0V, VCSM = VCS1 = VCS2 = 0.1 µA Leakage Current with Pre-Biased VILIM = 3.6V Output fBW-CS 3dB Bandwidth, CS1(2) to PWM 1.0 MHz COMPARATOR Input IILIM-SOURCE ILIM Source Current VILIM = 0.6V to 3.6V, VVIN = 5.5V 85 94 103 µA VCL Current Limit Threshold Voltage VILIM = 0.6V to 3.6V, VVIN = 5.5V −2.5 0 4.6 mV VILIM − VCS1(2) tD-CL Current Limit Comparator VCS1 or VCS2 stepped from 0.9V to 1.1V, VILIM 200 ns Propagation Delay = 1V tD-ILIM Master or Slave Fast Current VFB = 280 mV, 1-phase over-current: 7 Switch Limit Delay VCS1 OR VCS2 > VILIM cycles VFB = 280 mV, 2-phase over-current: 3 Switch VCS1 AND VCS2 > VILIM cycles tD-HICCUP Master or Slave Over-Current 1-phase over-current: 446 Switch Hiccup Mode Delay VCS1 OR VCS2 > VILIM cycles 2-phase over-current: 223 Switch VCS1 AND VCS2 > VILIM cycles tD-COOL-DOWN Hiccup Over-Current Cool-Down 6 ms Time Power Good: PGOOD, OVP, UVP VOVP OVP Threshold VFB rising edge 125 130 135 %VFB tD-RESTART OVP Restart Delay 2 ms NOVP-LATCH Number of OVP Events Before 7 Latch-Off VUVP UVP Threshold VFB falling edge 75 80 85 %VFB VUVP-HYS UVP Threshold Hysteresis 25 mV tD-OVP/UVP OVP/UVP Debounce Time 5 µs VPG-LO PGOOD Low Level IPGOOD = −4 mA 0.14 0.25 V IPG-LEAK PGOOD Leakage Current VPGOOD = 5.5V 5 300 nA Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM3754 |
Codice articolo simile - LM3754_15 |
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Descrizione simile - LM3754_15 |
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