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參數(shù)資料
| 型號： | TPS65257RHAT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, VQFN-40 |
| 文件頁數(shù)： | 10/34頁 |
| 文件大?。?/td> | 2100K |
| 代理商： | TPS65257RHAT |
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ind
Vin Vout
Vout
Lo
Io K
Vin fsw
-
=
×
Vin Vout
Vout
Iripple
Lo
Vin fsw
-
=
×
2
OUT
o
out
I
L
Co
V
Vout
D
×
>
× D
1
8
RIPPLE
Co
V
fsw
V
>
×
(
)
min
Vin
Vout
Icirms
Iout
Vin
-
=
×
SLVSB32
– SEPTEMBER 2011
Output Inductor Selection
To calculate the value of the output inductor, use Equation 2.
(2)
KIND is a coefficient that represents the amount of inductor ripple current relative to the maximum output current.
In general, KIND is normally from 0.1 to 0.3 for the majority of applications. A value of 0.1 will improve the
efficiency at light load, while a value of 0.3 will provide the lowest possible cost solution. The ripple current is:
(3)
Output Capacitor
There are two primary considerations for selecting the value of the output capacitor. The output capacitors are
selected to meet load transient and output ripple
’s requirements. If a minimum transient specification is required
use the following equation:
(4)
The following equation calculates the minimum output capacitance needed to meet the output voltage ripple
specification.
(5)
Where fSW is the switching frequency, VRIPPLE is the maximum allowable output voltage ripple, and VRIPPLE is the
inductor ripple current.
Input Capacitor
A minimum 10-
F X7R/X5R ceramic input capacitor is recommended to be added between VIN and GND of
each converter. The input capacitor must handle the RMS ripple current shown in the following equation.
(6)
Bootstrap Capacitor
The device has two integrated boot regulators and requires a small ceramic capacitor between the BST and LX
pins to provide the gate drive voltage for the high side MOSFET. The value of the ceramic capacitor should be
0.047
F. A ceramic capacitor with an X7R or X5R grade dielectric is recommended because of the stable
characteristics over temperature and voltage.
Push Button
The push button control is an optional feature. The user can power on and off the PMU without push button by
connecting the PB pin to GND. Alternatively, the user can power on and off the PMU by using a push button
on/off controller. When the 3.3V LDO
’s output is more than 2.6V, the internal logic will detect the voltage at PB to
determine whether the PB pin is used. When the voltage at PB is zero, the PMU will be activated after detecting
PB staying low for at least 20ms. On the other hand, if the voltage at PB is high, the PMU will keep off until the
first solid push button signal. After a valid push button signal is asserted, the PMU will follow each dc/dc
converter
’s EN and power up from a valid push button signal.
During power off, once the PB has been pressed, INT is switched low. This warns the system to shut down all
housekeeping tasks. During the off period, the PMU will keep off until a new PB signal is received. This
“off”
state can be overridden by recycling the input power.
18
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS65257
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