Texas Instruments TPS65810 Evaluation Module TPS65810EVM TPS65810EVM 数据表
产品代码
TPS65810EVM
www.ti.com
OUTPUT CAPACITOR SELECTION, SM1, SM2 CONVERTERS
I
RMSCout
+
1
*
V
OUT
V
IN
2
L
f
1
3
Ǹ
(13)
V
RMSCout
+
1
*
V
OUT
V
IN
L
f
ǒ
1
8
Cout
f
)
ESR
Ǔ
(14)
SLVS658B – MARCH 2006 – REVISED FEBRUARY 2007
Table 16. Inductors for Typical Operation Conditions (continued)
DEVICE
INDUCTOR VALUE
TYPE
COMPONENT SUPPLIER
DCDC2 converter
3.3
µ
H
CDRH2D18/HPNP-3R3
Sumida
3.3
µ
H
VLF4012AT-3R3M1R3
TDK
2.2
µ
H
VLCF4020-2R2
TDK
DCDC1 converter
3.3
µ
H
CDRH3D14/HPNP-3R2
Sumida
3.3
µ
H
CDRH4D28C-3R2
Sumida
3.3
µ
H
MSS5131-332
Coilcraft
2.2
µ
H
VLCF4020-2R2
TDK
The advanced Fast Response voltage mode control scheme of the SM1, SM2 converters implemented in the
TPS65020 allow the use of small ceramic capacitors with a typical value of 10
TPS65020 allow the use of small ceramic capacitors with a typical value of 10
µ
F for a 3.3-
µ
H inductor, without
having large output voltage under and overshoots during heavy load transients.
Ceramic capacitors having low ESR values have low output voltage ripple, and recommended values and
manufacturers are listed in
manufacturers are listed in
. Often, due to the low ESR, the ripple current rating of the ceramic capacitor
is adequate to meet the inductor’s currents requirements.
The RMS ripple current is calculated as:
At nominal load current, the inductive converters operate in PWM mode. 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: The output voltage ripple is maximum at the highest input voltage Vin.
sum of the voltage spike caused by the output capacitor ESR plus the voltage ripple caused by charging and
discharging the output capacitor: The output voltage ripple is maximum at the highest input voltage Vin.
At light load currents, the converters operate in PFM and the output voltage ripple is dependent on the output
capacitor value. The output voltage ripple is set by the internal PFM output voltage comparator delay and the
external capacitor. The typical output voltage ripple is less than 1% of the nominal output voltage.
capacitor value. The output voltage ripple is set by the internal PFM output voltage comparator delay and the
external capacitor. The typical output voltage ripple is less than 1% of the nominal output voltage.
Table 17. Input/Output Capacitors for Typical Operation Conditions
CAPACITOR VALUE
CASE SIZE
COMPONENT SUPPLIER
COMMENTS
22
µ
F
1260
TDK C3216X5R0J226M
Ceramic
22
µ
F
1260
Taiyo Yuden JMK316BJ226ML
Ceramic
10
µ
F
0805
Taiyo Yuden JMK212BJ106M
Ceramic
10
µ
F
0805
TDK C2012X5R0J106M
Ceramic
22
µ
F
0805
TDK C2012X5R0J226MT
Ceramic
22
µ
F
0805
Taiyo Yuden JMK212BJ226MG
Ceramic
Copyright © 2006–2007, Texas Instruments Incorporated
91
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