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LM2742 Folha de dados(PDF) 4 Page - National Semiconductor (TI) |
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LM2742 Folha de dados(HTML) 4 Page - National Semiconductor (TI) |
4 / 22 page Electrical Characteristics (Continued) V CC = 5V unless otherwise indicated. Typicals and limits appearing in plain type apply for TA=TJ=+25˚C. Limits appearing in boldface type apply over full Operating Temperature Range. Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. Symbol Parameter Conditions Min Typ Max Units GATE DRIVE I Q-BOOT BOOT Pin Quiescent Current BOOT = 12V, EN = 0 0˚C to +125˚C -40˚C to +125˚C 95 95 160 215 µA R DS1 Top FET Driver Pull-Up ON resistance BOOT-SW = 5V@350mA 3 Ω R DS2 Top FET Driver Pull-Down ON resistance BOOT-SW = 5V@350mA 2 Ω R DS3 Bottom FET Driver Pull-Up ON resistance BOOT-SW = 5V@350mA 3 Ω R DS4 Bottom FET Driver Pull-Down ON resistance BOOT-SW = 5V@350mA 2 Ω OSCILLATOR f OSC PWM Frequency R FADJ = 590k Ω 50 kHz R FADJ = 88.7k Ω 300 R FADJ = 42.2k Ω, 0˚C to +125˚C 500 600 700 R FADJ = 42.2k Ω, -40˚C to +125˚C 490 600 700 R FADJ = 17.4k Ω 1400 R FADJ = 11.3k Ω 2000 D Max Duty Cycle f PWM = 300kHz f PWM = 600kHz 90 88 % t on-min Minimum on-time 40 ns LOGIC INPUTS AND OUTPUTS V SD-IH SD Pin Logic High Trip Point 2.6 3.5 V V SD-IL SD Pin Logic Low Trip Point 0˚C to +125˚C -40˚C to +125˚C 1.3 1.25 1.6 1.6 V V PWGD-TH-LO PWGD Pin Trip Points FB Voltage Going Down 0˚C to +125˚C -40˚C to +125˚C 0.413 0.410 0.430 0.430 0.446 0.446 V V PWGD-TH-HI PWGD Pin Trip Points FB Voltage Going Up 0˚C to +125˚C -40˚C to +125˚C 0.691 0.688 0.710 0.710 0.734 0.734 V V PWGD-HYS PWGD Hysteresis FB Voltage Going Down FB Voltage Going Up 35 110 mV Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device operates correctly. Opearting Ratings do not imply guaranteed performance limits. Note 2: The human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin. Note 3: The LG and HG pin can have -2V to -0.5V applied for a maximum duty cycle of 10% with a maximum period of 1 second. There is no duty cycle or maximum period limitation for a LG and HG pin voltage range of -0.5V to 21V. www.national.com 4 |
Nº de peça semelhante - LM2742 |
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Descrição semelhante - LM2742 |
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