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TPS62290-Q1 Fiches technique(PDF) 8 Page - Texas Instruments |
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TPS62290-Q1 Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 27 page Zero-Pole AMP. Integrator Error Amp PFM Comp . +1% Voltage positioning PWM Comp . VREF Gate Driver Anti Shoot-Through Current Limit Comparator Current Limit Comparator VREF + 1% FB FB MODE SW EN VIN Softstart VOUT RAMP CONTROL Reference 0.6 V VREF Limit High Side Limit Low Side Sawtooth Generator Int. Resistor Network FB RI1 RI..N Mode GND 2.25 MHz Oscillator Thermal Shutdown Undervoltage Lockout 1.8 V Control Stage Copyright © 2016, Texas Instruments Incorporated 8 TPS62290-Q1, TPS62293-Q1 SLVSAI5B – SEPTEMBER 2010 – REVISED JUNE 2016 www.ti.com Product Folder Links: TPS62290-Q1 TPS62293-Q1 Submit Documentation Feedback Copyright © 2010–2016, Texas Instruments Incorporated 8 Detailed Description 8.1 Overview The TPS6229x-Q1 step-down converter operates with typically 2.25-MHz fixed frequency pulse width modulation (PWM) at moderate to heavy load currents. At light-load currents, the converter can automatically enter Power Save Mode and operates then in PFM mode. During PWM operation, the converter uses a unique fast-response voltage mode controller scheme with input voltage feedforward to achieve good line and load regulation, allowing the use of small ceramic input and output capacitors. At the beginning of each clock cycle initiated by the clock signal, the high-side MOSFET switch is turned on. The current flows now from the input capacitor through the high-side MOSFET switch through the inductor to the output capacitor and load. During this phase, the current ramps up until the PWM comparator trips and the control logic turns off the switch. The current limit comparator also turns off the switch if the current limit of the high-side MOSFET switch is exceeded. After a dead time preventing shoot-through current, the low-side MOSFET rectifier is turned on, and the inductor current ramps down. The current flows now from the inductor to the output capacitor and to the load. It returns to the inductor through the low-side MOSFET rectifier. The next cycle is initiated by the clock signal again turning off the low-side MOSFET rectifier and turning on the high-side MOSFET switch. 8.2 Functional Block Diagram |
Numéro de pièce similaire - TPS62290-Q1_16 |
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Description similaire - TPS62290-Q1_16 |
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