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TPS5402DR Datasheet(PDF) 8 Page - Texas Instruments |
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TPS5402DR Datasheet(HTML) 8 Page - Texas Instruments |
8 / 18 page 1.167 OSC SW R (k ) 21.82 f - W = × TPS5402 SLVSBK4 – SEPTEMBER 2012 www.ti.com OVERVIEW The TPS5402 is a 28-V, 1.7-A, step-down (buck) converter with an integrated high-side N-channel MOSFET. To improve performance during line and load transients, the device implements a constant frequency, current mode control which reduces output capacitance and simplifies external frequency compensation design. The TPS5402’s switching frequency is adjustable with an external resistor or fixed by connecting the frequency program pin to GND or leaving it unconnected. The TPS5402 starts switching at VIN equal to 3.5 V. The operating current is 100 μA typically when not switching and under no load. When the device is disabled, the supply current is 1 μA typically. The integrated 120-m Ω high-side MOSFET allows for high efficiency power supply designs with continuous output currents up to 1.7 A. The TPS5402 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. By adding an external capacitor, the slow start time of the TPS5402 can be adjustable which enables flexible output filter selection. To improve the efficiency at light load conditions, the TPS5402 enters a special pulse skipping mode when the peak inductor current drops below 300 mA typically. The frequency foldback reduces the switching frequency during startup and over current conditions to help control the inductor current. The thermal shut down gives the additional protection under fault conditions. DETAILED DESCRIPTION Adjustable Frequency PWM Control The TPS5402 uses an external resistor to adjust the switching frequency. Connecting the ROSC pin to ground fixes the switching frequency at 70 kHz, leaving it open gives 120-kHz switching frequency. Figure 11. ROSC vs Switching Frequency (1) For operation at 300 kHz, an 85.5-k Ω resistor is required. 8 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: TPS5402 |
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