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參數資料
| 型號： | TPS53851RHHT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC36 |
| 封裝： | PLASTIC, VQFN-36 |
| 文件頁數： | 40/66頁 |
| 文件大小： | 1264K |
| 代理商： | TPS53851RHHT |
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(
)
(
)
(
)
PK
IN
SW
DRV
SW
SW sw
GT drv
I
V
f
R
Qgd
Qgs
P
0.066 W
V
+
=
( )
(
)
(
)
SW tot
SW cond
SW SW
P
0.361W
=
+
=
I
SRrms +
(1 * D)
I
OUT
2
)
I
RIPPLE
2
12
+ 18.7 A
(
)
(
)
(
)
( ) ( )
2
DS on
SR cond
SR rms
R
sr
P
I
0.315 W
N
=
+
=
(
)
DIODE
OUT
D1
D2
SW
P
I
t
Vr
f
0.85W
=
+
=
( )
(
)
DIODE
SR tot
SR cond
P
1.165 W
=
+
=
R + 1.33
39.2
103
f*1.041
SW
* 7 + 71.5 kW
BIAS
OUT
R1
R
= 0.7 ×
= 8.75k
V
- 0.7
L
R1//R2 =
= 5k
DCR × C1
R 1 = R 2 = 1 0 k
www.ti.com
SLUS985 – DECEMBER 2009
(29)
The calculated total loss in the high-side MOSFET is calculated in Equation 30.
(30)
The power losses in the low-side SR MOSFET are calculated in the following equations.
The RMS current in the low-side MOSFET is shown in Equation 31.
(31)
The RDS(on) is 1.8 m when the MOSFET gate voltage is 4.5 V.
The total conduction loss in the two low-side MOSFETs is shown in Equation 32.
(32)
N is the number of MOSFETs. Here, it is equal to 2.
The total power loss in the body diode is:
(33)
So the calculated total loss in the SR MOSFET is:
(34)
6.1.5
Step 5: Peripheral Component Design
6.1.5.1
Switching Frequency Setting (RT pin 5):
(35)
In the design, a 62-k
resistor is selected. The actual switching frequency is 510kHz.
6.1.5.2
Output Voltage Setting (FB1 pin 36):
Substitute R1 with 10 k
and then calculate RBIAS.
(36)
6.1.5.3
Current Sensing Network Design (CS1 pin 31 and CSRT1 pin32)
For small pulse width, to avoid the sub-harmonics brought by the loop delay, a resistor divider is usually
used to attenuate the current feedback information as described in the Inductor DCR Current Sense
section.
Choosing C1 a value for 0.1-
μF, and let R1 and R2 be equal, calculating R1 and R2 with the following
equations:
(37)
(38)
A simplified equation to determine if the design produces sub-harmonics is shown in Equation 39.
Copyright 2009, Texas Instruments Incorporated
DESIGN EXAMPLES
45
Product Folder Link(s): TPS53851
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