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LM2619 Fiches technique(PDF) 11 Page - Texas Instruments |
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LM2619 Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 21 page 20 ?s/ DIV 50 mV/DIV AC Coupled 300 mA 100 mA I OUT VOUT VIN = 3.6V VOUT = 1.5V SYNC = V IN 20 Ps/DIV 20 mV/DIV AC Coupled 4.0V 3.0V VIN VOUT VOUT = 1.5V VIN = 3.0V to 4.0V, tr = tf = 10 Ps IOUT = 100 mA SYNC = VIN LM2619 www.ti.com SNVS212B – NOVEMBER 2002 – REVISED MAY 2013 DROPOUT CONSIDERATIONS The LM2619 can be used to provide fixed output voltages by using external feedback resistors. The output voltage can be set from 1.5V to 3.6V. The internal reference voltage for the error amplifier is 1.5V. In cases where the output voltage is set higher than 2.5V, the part will go into dropout or 100% duty cycle when the input voltage gets close to the set output voltage. Near dropout the on time of the P-FET may exceed one PWM clock cycle and cause higher ripple on the output for load currents greater than 450mA. This increased ripple will exist for a narrow range of input voltages close to the 100% duty cycle and once the input voltage goes down further the P-FET will be fully on. See SETTING THE OUTPUT VOLTAGE in Application Information for further details. In dropout conditions the output voltage is VIN − IOUT (Rdc + RDSON (P)) where Rdc is the series resistance of the inductor and RDSON (P) is the on resistance of the PFET. Load Transient Response Line Transient Response (Circuit in Figure 3) (Circuit in Figure 3) Figure 24. Figure 25. SOFT-START The LM2619 has soft start to reduce current inrush during power-up and startup. This reduces stress on the LM2619 and external components. It also reduces startup transients on the power source. Soft start is implemented by ramping up the reference input to the error amplifier of the LM2619 to gradually increase the output voltage. THERMAL SHUTDOWN PROTECTION The LM2619 has a thermal shutdown protection function to protect itself from short-term misuse and overload conditions. When the junction temperature exceeds 150°C the device turns off the output stage and when the temperature drops below 130°C it initiates a soft start cycle. Prolonged operation in thermal shutdown conditions may damage the device and is considered bad practice. Copyright © 2002–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM2619 |
Numéro de pièce similaire - LM2619_15 |
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Description similaire - LM2619_15 |
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