參數(shù)資料
型號(hào)： TPS65270RGET
廠(chǎng)商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 1400 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 4 X 4 MM, PLASTIC, VQFN-24
文件頁(yè)數(shù)： 4/20頁(yè)
文件大?。?/td> 1432K
代理商： TPS65270RGET
T
ms
V
ss
REF
(
) =
( )
(C nF
ss
(
)
-
I
A
ss
( )
)
0.8
2
1
0.8
O
V
R
V
=
×
÷
-
è
FB
0.8V
Vo
+
-
TPS65270
R1
R2
SLVSAX7
– AUGUST 2011
Soft Start Time
The device has an internal pull-up current source of 5
A that charges an external slow start capacitor to
implement a slow start time. Equation 2 shows how to select a slow start capacitor based on an expected slow
start time. The voltage reference (VREF) is 0.8 V and the slow start charge current (Iss) is 5 A. The soft start
circuit requires 1 nF per 160
s to be connected at the SS pin. An 800-s soft-start time is implemented for all
converters fitting 4.7 nF to the relevant pins.
(2)
Adjusting the Output Voltage
The output voltage is set with a resistor divider from the output node to the FB pin. It is recommended to use 1%
tolerance or better divider resistors. In order to improve efficiency at light load, start with 40.2 k
for the R1
resistor and use the Equation 3 to calculate R2.
(3)
Figure 15. Voltage Divider Circuit
Input Capacitor
Use 10-
μF X7R/X5R ceramic capacitors at the input of the converter inputs. These capacitors should be
connected as close as physically possible to the input pins of the converters.
Bootstrap Capacitor
The device has two integrated boot regulators and requires a small ceramic capacitor between the BST and LX
pin to provide the gate drive voltage for the high side MOSFET. The value of the ceramic capacitor is
recommended to be 0.047
μF. A ceramic capacitor with an X7R or X5R grade dielectric is desired because of
the stable characteristics over temperature and voltage.
Error Amplifier
The device has a transconductance error amplifier. The transconductance of the error amplifier is 130
A/V
during normal operation. The frequency compensation network is connected between the COMP pin and ground.
Loop Compensation
TPS65270 is a current mode control dc/dc converter. The error amplifier has 130-
A/V transconductance.
12
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS65270
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