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TPS54302DDCT Datasheet(PDF) 8 Page - Texas Instruments |
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TPS54302DDCT Datasheet(HTML) 8 Page - Texas Instruments |
8 / 28 page BOOT SW VIN EN - + + LS MOSFET Current Limit Oscillator Maximum Clamp Overload Recovery Soft Start Voltage Reference Slope Compensation HS MOSFET Current Comparator Minimum Clamp Pulse Skip Power Stage And Dead time Control Logic Boot UVLO Boot Charge UVLO Thermal Hiccup Shutdown Logic ERROR AMPLIFIER Regulator VIN - + OV comparator 0.596V Current Sense Current Sense FB GND Hiccup Shutdown Hiccup Shutdown EN Compatator Ip Ih 20kohm 2.04nF 2pF Copyright © 2016, Texas Instruments Incorporated 8 TPS54302 SLVSDG6A – MAY 2016 – REVISED MAY 2016 www.ti.com Product Folder Links: TPS54302 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The device is a 28-V, 3-A, synchronous step-down (buck) converter with two integrated n-channel MOSFETs. To improve performance during line and load transients the device implements a constant-frequency, peak current mode control which reduces output capacitance. The optimized internal compensation network minimizes the external component counts and simplifies the control loop design. The TPS54302’s switching frequency is fixed to 400 kHz. The TPS54302 starts switching at VIN equal to 4.5 V. The operating current is 45 μA typically when not switching and under no load. When the device is disabled, the supply current is 2 µA typically. The integrated 85-m Ω high-side MOSFET and 40-mΩ low-side MOSFET allow for high efficiency power supply designs with continuous output currents up to 3 A. The TPS54302 reduces the external component count by integrating the boot recharge diode. The bias voltage for the integrated high-side MOSFET is supplied by an external capacitor on the BOOT to PH pins. The boot capacitor voltage is monitored by an UVLO circuit and will turn the high-side MOSFET off when the voltage falls below a preset threshold of 2.1 V typically. The device minimizes excessive output overvoltage transients by taking advantage of the overvoltage comparator. When the regulated output voltage is greater than 108% of the nominal voltage, the overvoltage comparator is activated, and the high-side MOSFET is turned off and masked from turning on until the output voltage is lower than 104%. The TPS54302 device has internal 5-ms soft-start time to minimize inrush currents. 7.2 Functional Block Diagram |
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