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TPS658620ZQZT датащи(PDF) 93 Page - Texas Instruments

номер детали TPS658620ZQZT
подробное описание детали  Advanced Power Management Unit
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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TPS658620ZQZT датащи(HTML) 93 Page - Texas Instruments

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RMSCout
Vout
1
1
Vin
I
= Vout
L
f
2
3
-
´
´
´
´
(4-2)
Vout
1
1
Vin
Vout = Vout
+ ESR
L
8
Cout
-
æ
ö
D
´
´ ç
÷
´ ¦
´
´ ¦
è
ø
(4-3)
4.1.3
Input Capacitor Selection
4.2 XTAL OSCILLATOR PCB – GENERAL GUIDELINES
TPS658620
Advanced Power Management Unit
www.ti.com
SLVS993 – OCTOBER 2009
If ceramic output capacitors are used the capacitor RMS ripple current rating will always meet the
application requirements. Just for completeness the RMS ripple current is calculated as:
At nominal load current the inductive converters operate in PWM mode and the overall output voltage
ripple is the sum of the voltage spike caused by the output capacitor ESR plus the voltage ripple caused
by charging and discharging the output capacitor:
Where the highest output voltage ripple occurs at the highest input voltage Vin.
At light load currents the converters operate in Power Save Mode and the output voltage ripple is
dependent on the output capacitor value. The output voltage ripple is set by the internal comparator delay
and the external capacitor. The typical output voltage ripple is less than 1% of the nominal output voltage.
Because of the nature of the buck converter having a pulsating input current, a low ESR input capacitor is
required for best input voltage filtering and minimizing the interference with other circuits caused by high
input voltage spikes. The converters need a ceramic input capacitor of 10
µF. The input capacitor can be
increased without any limit for better input voltage filtering.
Table 4-2. Capacitors
22
µF
0805
TDK C2012X5R0J226MT
Ceramic
22
µF
0805
Taiyo Yuden JMK212BJ226MG
Ceramic
10
µF
0805
Taiyo Yuden JMK212BJ106M
Ceramic
10
µF
0805
TDK C2012X5R0J106M
Ceramic
Table 4-3. External Crystal Specifications
External Crystal Requirements [Typ crystal – Epson MC146]
PARAMETER
DESCRIPTION
MIN
TYP
MAX
UNIT
FOSC
Nominal crystal resonant frequency
32.768
kHz
Frequency Tolerance
ΔF/FOSC
–20
20
ppm
B
Parabolic Temp Co
0.04
×10–6
1/
°C2
ESR
Equivalent Series Resistance
65
k
Ω
CLOAD
Load Capacitance
7
pF
CSHUNT
Shunt capacitance
0.5
0.8
1.2
pF
PDRIVE
Drive power
0.5
1
µW
Aging
–3
3
ppm/Yr
The jitter observed in the OUT32K pin is heavily dependent on the board layout close to the XTAL1 and
XTAL2 pins. The following layout/assembly procedures are recommended :
• Layout a good ground plane around the oscillator pins.
• Prevent crosstalk from other clock or data lines into oscillator pins XIN and XOUT.
• Avoid running PCB traces underneath or adjacent to the XIN and XOUT pins.
Submit Documentation Feedback
APPLICATION INFORMATION
93


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