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TPS2500 датащи(PDF) 24 Page - Texas Instruments

номер детали TPS2500
подробное описание детали  INTEGRATED USB POWER SWITCH WITH BOOST CONVERTER
PDF  43 Pages
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производитель  TI2 [Texas Instruments]
домашняя страница  https://www.ti.com
Logo TI2 - Texas Instruments

TPS2500 датащи(HTML) 24 Page - Texas Instruments

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AUX
TOTAL
IN
IN
V
I
5.1 V
1 A
I
2.1 A
V
2.7 V
0.9
´
´
=
=
=
´ h
´
Time
Di
I
L
I
IN
I
L_pk
IN
i
0.3
I
0.3
2.1 A
630 mA
D =
´
=
´
=
L_pk
IN
i
I
I
2.42 A
3 A
2
D
=
+
=
<
(
)
(
)
(
)
(
)
AUX
IN
IN
SYNC
L
on
on
off
AUX
IN
SYNC
PWM
V
V
I
R
R
t
D
t
t
V
I
R
R
5.1 V
2.7 V
2.1 A
0.1.
0.07.
0.54
5.1 V
2.1 A
0.1.
0.1.
é
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+
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ú
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+
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IN
6
V
D
2.7 V 0.54
L
2.31. H
f
i
1 10 Hz 0.63 A
´
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´
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TPS2500, TPS2501
SLVS886C – OCTOBER 2008 – REVISED AUGUST 2010
www.ti.com
AUX Voltage
The AUX voltage of the TPS2500 is internally fixed at 5.1 V.
Determine Maximum Total Current (IAUX + IUSB)
Using Figure 12, the maximum total current at VIN = 2.7 V is 1 A using the conservative line. The design
requirements are met for this application.
Power Inductor
The inductor ripple current,
Δi, should be at least 20% of the average inductor current to avoid erratic operation
of the peak-current-mode PWM controller. Assume an inductor ripple current,
Δi, which is 30% of the average
inductor current and a power-converter efficiency, h, of 90%. Using the minimum input voltage, the average
inductor current at VIN = 2.7 V is:
Figure 23. Waveform of Current in Boost Inductor
The corresponding inductor ripple current is:
Verify that the peak inductor current is less than the 3-A peak switch current:
The following equation estimates the duty cycle of the low-side PWM MOSFET:
where RPWM is the low-side control MOSFET on-resistance, RSYNC is the high-side synchronous MOSFET
on-resistance, and RL is an estimate of the inductor dc resistance.
The following equation calculates the recommended inductance for this design.
24
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Copyright © 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS2500 TPS2501



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