25-A converter with over efficiency using LFPAK MOSFETs This smal
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LFPAK MOSFETs PH2525L PH5525L application
25-A converter with over efficiency using LFPAK MOSFETs
This small, low-cost design, which combines MOSFETs LFPAK packages with controller from Texas Instruments, uses industry-standard construction operating conditions deliver output current amps efficiency over 90%.
features Output current amps Efficiency above Input from volts Output voltage from volts Selectable output voltage Components used: sync PH2525L control PH5525L Texas Instruments controller TPS40071 This point-of-load (POL) converter combines MOSFETs, housed loss-free packages (LFPAK), controller TPS40071 from Texas Instruments. SOT669 LFPAK package same compact footprint package. using underside thermal electrically connected Drain, NXP's LFPAK MOSFETs enable superior level on-resistance thermal performance.
With adequate airflow, converter provides continuous output currents with efficiency over 90%. Using LFPAK MOSFETs reduces footprint design. Implemented four-layer board, converter measures Large areas Drain Source used dissipate heat generated MOSFETs. converter uses 25-V MOSFETs create single-phase buck converter that full operating range from with nominal input voltage PH2525L 2.5-m sync FET, PH5525L 5.5-m control FET. output voltage (VO) adjustable from with single resistor. Changes output voltage should accompanied adjustments current-limit resistor.
efficiency diagram plotted voltages input voltage both sweeps switching frequency kHz. maximum current swept level that produces case temperatures Airflow (200 LFM). With greater airflow, higher currents achieved.
Texas Instruments controller provides several benefits, including voltage operating range high-side current limit, source sink drivers, anti-cross conduction protection.
3.3-V efficiency
Efficiency
1.2-V efficiency
Load current
Implemented four-layer board, 25-A converter measures
Efficiency 25-A converter over
(empty) (empty)
90.9
46.4
1180
LVBP SGND COMP
ILIM BOOST HDRV TPS40071 LDRV PGND
PH6325L LFPAK
(empty) (empty)
16.2
8.66 ROS(1) 12.1
PH2625L LFPAK
RTEST 49.9
001aae417
reference voltage
Block diagram 25-A converter
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2007 B.V. rights reserved. Reproduction whole part prohibited without prior written consent copyright owner. information presented this document does form part quotation contract, believed accurate reliable changed without notice. liability will accepted publisher consequence use. Publication thereof does convey imply license under patent- other industrial intellectual property rights. Date release: January 2007 Document order number: 9397 15885 Printed Netherlands
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