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參數(shù)資料
| 型號： | TPS40132RHBT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 40 A SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | GREEN, PLASTIC, QFN-32 |
| 文件頁數(shù)： | 14/40頁 |
| 文件大?。?/td> | 1032K |
| 代理商： | TPS40132RHBT |
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f
PK
IN
SW
DRV
sw
SW (sw )
I
V
R
(Qgd
Qgs
)
P
0.438 W
Vgtdrv
+
=
(26)
SW (tot)
(cond)
SW (SW )
P
Psw
P
0.935 W
=
+
=
(27)
(
)
(
)
2
RIPPLE
SRrms
OUT
I
(1
D)
I
18.7A
12
÷
=
-
+
=
÷
è
(28)
(
)
2
DS(on)(sr )
SR(cond)
SRrms
R
P
I
0.77 W
2
=
=
÷
÷
è
(29)
f
DIODE
OUT
D
f
SW
P
2
I
t
V
0.49 W
=
=
(30)
SR(tot)
SR(cond)
DIODE
P
1.26 W
=
+
=
(31)
Step 5: Peripheral Component Design
f
3
T
SW
36
10
R
0.8
9
75 k
=
-
=
W
÷
÷
è
(32)
3
SS
3
t
3
10
C
25 nF
120
10
120
10
-
=
(33)
3
BIAS
OUT
10
R
0.6
6.67 k
V
0.6
=
=
W
÷
÷
-
è
(34)
SLUS776A – DECEMBER 2007 – REVISED FEBRUARY 2008
The calculated total loss is the high-side MOSFET is shown in Equation 27.
The power losses in the low-side SR MOSFET is calculated using <CR>.
The RMS current in the low-side MOSFET is calculated using Equation 28.
The RDS(on)(sr) of each HAT2164H is 4.4m when the gate voltage is 4.5 V. Two HAT2164H are used in parallel
to reduce the conduction loss. The conduction loss in the low-side MOSFETs is shown in Equation 29.
The total power loss in the body diode is shown in Equation 30.
Therefore, the calculated total loss in the SR MOSFETs is as described in Equation 31.
RT (Pin 17) Switching Frequency Setting
In Equation 32, the phase switching frequency and it is 350 kHz here.
SS (Pin 23) Soft-Start
To obtain a 3-ms soft-start time, calculate CSS which is connected between SS and GND.
FB (Pin 11) Output Voltage Setting
Select the top resistor to be 10 k
(Pin 6, Pin 7, Pin 18 and Pin 19) Current Sensing Network Design
In this design, the lossless inductor DCR sensing is applied. Choose the sense capacitor a value for 0.1
F, and
calculate the sense resistor R with Equation 35 and Equation 36.
Copyright 2007–2008, Texas Instruments Incorporated
21
Product Folder Link(s) :TPS40132
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