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LM20146 bảng dữ liệu(PDF) 4 Page - Texas Instruments |
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LM20146 bảng dữ liệu(HTML) 4 Page - Texas Instruments |
4 / 29 page LM20146 SNVS563B – NOVEMBER 2008 – REVISED FEBRUARY 2009 www.ti.com Electrical Characteristics (continued) Unless otherwise stated, the following conditions apply: AVIN = PVIN = VIN = 5V. Limits in standard type are for TJ = 25°C only, limits in bold face type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are guaranteed 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. Symbol Parameter Conditions Min Typ Max Unit Gm Error Amplifier Transconductance ICOMP = ± 50 µA 450 510 600 µmho AVOL Error Amplifier Voltage Gain 2000 V/V Power Good VOVP Over Voltage Protection Rising Threshold With respect to VFB 105 108 111 % VOVP_HYS Over Voltage Protection Hysteresis 2 3 % VPGTH PGOOD Rising Threshold With respect to VFB 92 94 96 % VPGHYS PGOOD Falling Hysteresis 2 3 % TPGOOD PGOOD deglitch time 16 µs IOL PGOOD Low Sink Current VPGOOD = 0.4V 0.6 1 mA IOH PGOOD High Leakage Current VPGOOD = 5V 5 100 nA Enable VIH_EN EN Pin turn-on Threshold VEN Rising 1.08 1.18 1.28 V VEN_HYS EN Pin Hysteresis 66 mV Thermal Shutdown TSD Thermal Shutdown 160 °C TSD_HYS Thermal Shutdown Hysteresis 10 °C Thermal Resistance θJA Junction to Ambient See(1) 25 °C/W (1) The maximum allowable power dissipation is a function of the maximum junction temperature, TJ_MAX, the junctions-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: PD_MAX = (TJ_MAX – TA)/θJA. The maximum power dissipations of 2.6W is determined using TA = 25°C, θJA = 25°C/W, and TJ_MAX = 125°C. The θJA specification of 25°C/W listed in the electrical characteristics table is measured with the part surface mounted to a 2" x 2" FR4 4 layer board. See Figure 36 for more detailed θJA information. 4 Submit Documentation Feedback Copyright © 2008–2009, Texas Instruments Incorporated Product Folder Links: LM20146 |
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