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TPS54521RHLR Datasheet(PDF) 10 Page - Texas Instruments |
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TPS54521RHLR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 35 page V – Input Voltage – V I 7 8 9 10 11 3 8 13 18 T = –40 C J ° T = 25 C J ° T = 125 C J ° T – Junction Temperature – C J ° 70 80 90 100 110 –50 –25 0 25 50 75 100 125 120 VIN = 12 V IOUT = 2 A T – Junction Temperature – C J ° 3 4 5 6 –50 –25 0 25 50 75 100 125 RT = 100 K VIN = 12 V IOUT = 2 A 150 T – Junction Temperature – C J ° 2.0 2.1 2.2 –50 –25 0 25 50 75 100 125 TPS54521 SLVS981 – JUNE 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) HIGH-SIDE CURRENT LIMIT THRESHOLD vs MINIMUM CONTROLLABLE ON TIME vs INPUT VOLTAGE TEMPERATURE Figure 13. Figure 14. MINIMUM CONTROLLABLE DUTY RATIO vs JUNCTION TEMPERATURE BOOT-PH UVLO THRESHOLD vs TEMPERATURE Figure 15. Figure 16. OVERVIEW The device is a 17-V, 5-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 also simplifies external frequency compensation. The wide switching frequency of 200 kHz to 900 kHz allows for efficiency and size optimization when selecting the output filter components. The switching frequency is adjusted using a resistor to ground on the RT/CLK pin. The device also has an internal phase lock loop (PLL) controlled by the RT/CLK pin that can be used to synchronize the switching cycle to the falling edge of an external system clock. The device has been designed for safe monotonic startup into pre-biased loads. The default start up is when VIN is typically 4.0V. The EN pin has an internal pull-up current source that can be used to adjust the input voltage under voltage lockout (UVLO) with two external resistors. In addition, the EN pin can be left floating for the device to automatically start with the internal pull-up current. The total operating current for the device is approximately 600mA when not switching and under no load. When the device is disabled, the supply current is typically less than 2mA. The integrated MOSFETs allow for high efficiency power supply designs with continuous output currents up to 5 amperes. The MOSFETs have been sized to optimize efficiency for lower duty cycle applications. 10 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s) :TPS54521 |
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