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TPS54335ADRCR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS54335ADRCR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 53 page ERROR AMPLIFIER Boot Charge Current Sense Slope Compensation Voltage Reference VSENSE SS (TPS54336A) COMP RT (TPS54335A) BOOT GND Thermal Hiccup EN Enable Comparator Shutdown Logic Enable Threshold EXPOSED THERMAL PAD Power Stage and Deadtime Control Logic OV Minimum Clamp Pulse Skip Ip Ih VIN HS MOSFET Current Comparator Current Sense VIN Boot UVLO PH Hiccup Shutdown Hiccup Shutdown Oscillator UVLO + + Overload Recovery Maximum Clamp Regulator LS MOSFET Current-Limit 11 TPS54335A, TPS54335-1A, TPS54336A www.ti.com SLVSCD5D – NOVEMBER 2014 – REVISED FEBRUARY 2016 Product Folder Links: TPS54335A TPS54335-1A TPS54336A Submit Documentation Feedback Copyright © 2014–2016, Texas Instruments Incorporated 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Fixed-Frequency PWM Control The device uses a fixed-frequency, peak current-mode control. The output voltage is compared through external resistors on the VSENSE pin to an internal voltage reference by an error amplifier which drives the COMP pin. An internal oscillator initiates the turn on of the high-side power switch. The error amplifier output is compared to the current of the high-side power switch. When the power-switch current reaches the COMP voltage level the high-side power switch is turned off and the low-side power switch is turned on. The COMP pin voltage increases and decreases as the output current increases and decreases. The device implements a current-limit by clamping the COMP pin voltage to a maximum level and also implements a minimum clamp for improved transient-response performance. 7.3.2 Light-Load Operation The device monitors the peak switch current of the high-side MOSFET. When the peak switch current is lower than 0.5 A (typical), the device stops switching to boost the efficiency until the peak switch current again rises higher than 0.5 A (typical). |
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