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TPS53353 데이터시트(PDF) 22 Page - Texas Instruments

부품명 TPS53353
상세설명  TPS53353 High-Efficiency 20-A Synchronous Buck Converter With Eco-mode?
PDF  37 Pages
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI - Texas Instruments

TPS53353 데이터시트(HTML) 22 Page - Texas Instruments

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IN
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OCP
DS(on)
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TRIP
TRIP
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2 L f
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R2
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60
TPS53353
SLUSAK2B – AUGUST 2011 – REVISED FEBRUARY 2015
www.ti.com
4. CHOOSE THE OUTPUT CAPACITORS
When organic semiconductor capacitors or specialty polymer capacitors are used, for loop stability,
capacitance and ESR should satisfy Equation 6. For jitter performance, Equation 10 is a good starting point
to determine ESR.
where
•
D is the duty factor.
•
The required output ripple slope is approximately 10 mV per tSW (switching period) in terms of VFB terminal
voltage.
(10)
5. DETERMINE THE VALUE OF R1 AND R2
The output voltage is programmed by the voltage-divider resistor, R1 and R2 shown in Figure 37. R1 is
connected between VFB pin and the output, and R2 is connected between the VFB pin and GND.
Recommended R2 value is from 1 k
Ω to 20 kΩ. Determine R1 using Equation 11.
(11)
6. CHOOSE THE OVERCURRENT SETTING RESISTOR
The overcurrent setting resistor, RTRIP, can be determined by .
where
•
ITRIP is the TRIP pin sourcing current (10 µA).
•
RDS(on) is the thermally compensated on-time resistance value of the low-side MOSFET.
(12)
Use an RDS(on) value of 1.6 mΩ for an overcurrent level of approximately 20 A. Use an RDS(on) value of
1.7 m
Ω for overcurrent level of approximately 10 A.
8.2.1.3 Application Curves
Figure 39. Enable Turnon
Figure 40. Enable Turnoff
22
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Product Folder Links: TPS53353



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