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TPS62231DRY Datasheet(PDF) 20 Page - Texas Instruments

No. de Pieza. TPS62231DRY
Descripción  3 MHz Ultra Small Step Down Converter in 1x1.5 SON Package
Descarga  28 Pages
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Fabricante  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS62231DRY Datasheet(HTML) 20 Page - Texas Instruments

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APPLICATION INFORMATION
TPS62230
L
1/2.2
H
m
VIN
EN
MODE
GND
FB
SW
2.5V
V
OUT
2.7V-6V
V
IN
2.2
C
IN
mF
4.7
F
m
C
OUT
1.8V
V
OUT
2.05V-6V
V
IN
2.2
F
m
C
IN
L
1/2.2
H
m
C
4.7
F
OUT
m
TPS62231
VIN
EN
MODE
SW
FB
GND
1.2V
V
OUT
2.05V-6V
V
IN
2.2
F
m
C
IN
L
1/2.2
H
m
C
4.7
F
OUT
m
TPS62232
VIN
EN
MODE
SW
FB
GND
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
INDUCTOR SELECTION
L
Vout
1
Vin
I
= Vout
L
-
D
´
´ ¦
(4)
L
Lmax
outmax
I
I
= I
+
2
D
(5)
TPS62230
TPS62231
TPS62232
SLVS941 – APRIL 2009 ..................................................................................................................................................................................................... www.ti.com
Figure 41. TPS62230 2.5V Output
Figure 42. TPS62231 1.8V Output
Figure 43. TPS62232 1.2V Output
The TPS6223X is optimized to operate with effective inductance values in the range of 0.7
µH to 4.3µH and with
effective output capacitance in the range of 2.0
µF to 15µF. The internal compensation is optimized to operate
with an output filter of L = 1.0
µH/2.2µH and C
OUT = 4.7µF. Larger or smaller inductor/capacitor values can be
used to optimize the performance of the device for specific operation conditions. For more details, see the
CHECKING LOOP STABILITY section.
The inductor value affects its peak-to-peak ripple current, the PWM-to-PFM transition point, the output voltage
ripple and the efficiency. The selected inductor has to be rated for its dc resistance and saturation current. The
inductor ripple current (
ΔIL) decreases with higher inductance and increases with higher VIN or VOUT. Equation 4
calculates the maximum inductor current under static load conditions. The saturation current of the inductor
should be rated higher than the maximum inductor current as calculated with Equation 5. This is recommended
because during heavy load transient the inductor current will rise above the calculated value.
With:
f = Switching Frequency
L = Inductor Value
ΔIL= Peak to Peak inductor ripple current
ILmax = Maximum Inductor current
20
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Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS62230 TPS62231 TPS62232


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