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參數(shù)資料
| 型號： | TPS40180RGER |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | GREEN, PLASTIC, VQFN-24 |
| 文件頁數(shù)： | 31/52頁 |
| 文件大?。?/td> | 1291K |
| 代理商： | TPS40180RGER |
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SW(tot)
SW(cond)
SW(SW )
P
0.82 W
=
+
=
(29)
2
RIPPLE
SRrms
OUT
I
(1 D)
I
18.7A
12
÷
=
-
+
=
÷
è
(30)
(
)
2
DS(on)(sr)
SR(cond)
SRrms
R
P
I
0.77 W
2
=
=
÷
÷
è
(31)
D IO D E
O U T
D
f
S W
P
2
I
t
V
f
0 .3 9 W
=
=
(32)
SR(tot)
SR(cond)
DIODE
P
1.16 W
=
+
=
(33)
Peripheral Component Design
(
)
5
4
T
2
SW
3.675 10
2.824 10
R
5.355
100k
f
=
+
-
=
W
(34)
BIAS
OUT
R1
R
0.7
8.66k
V
0.7
=
=
W
-
(35)
L
R
6k
DCR C1
=
W
(36)
SLVS753B – FEBRUARY 2007 – REVISED NOVEMBER 2007
The RMS current in the low-side MOSFET is:
The RDS(on)(sr) of each HAT2164 is 4.4 m when the gate voltage is 4.5 V. Two HAT2164 FETs are used in this
design.
The conduction loss in the low-side MOSFETs is:
The total power loss in the body diode is:
Therefore, the calculated total loss in the SR MOSFETs is:
Switching Frequency Setting (RT)
In the design, a 95.3 k
resistor is selected. The actual switching frequency is 280 kHz.
Output Voltage Setting (FB)
Substitute the top resistor R1 with 10 k
in the following equation , and then calculate the bottom bias resistor.
Current Sensing Network Design (CS+, CS-)
Choosing C1 a value for 0.1
F, and calculating R with the following equations.
Overcurrent Protection (ILIM)
ILIM pin is connected to VSH and VOUT pins with R1 and R2 respectively. Equation 15 and Equation 16 are
used to calculate the over current setting resistors. The DC over current rating is set at 28 A. The calculated
values are 41 k
and 830 k for R1 and R2 respectively. In the final design, R1 and R2 are chosen as 36.5 k
and 787 k
for temperature and other tolerances compensation.
VREG (PVCC)
A 4.7-
F capacitor is recommended to filter noise.
Copyright 2007, Texas Instruments Incorporated
37
Product Folder Link(s): TPS40180
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