參數(shù)資料
型號: TPS55010RTET
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: SWITCHING REGULATOR, PQCC16
封裝: 3 X 3 MM, GREEN, PLASTIC, WQFN-16
文件頁數(shù): 9/40頁
文件大小: 1417K
代理商: TPS55010RTET
(
)
SEC
IN
OUT
PRI
OPRI
sw
N
V
× D × 1-D
1 + D
ILpri _ negpk
- I
×
-
N
1 - D
2 ×
× L
÷
÷
÷
è
f
(
)
IN
OPRI
sw
V
× D × 1 - D
Im_ ripple =
× L
f
1
2
SEC
OUT
PRI
N
D
Ihs _ rms
D × I
+
× Im_ ripple
N
12
÷
÷
÷
÷
÷
÷
÷
è
÷
è
(
)
1
2
SEC
2
SEC
PRI
OUT
Im_ripple x I
x N
N
3 × D-1
1 - D
Ils _ rms
× I
x
+
× Im_ripple
3 × 1-D
N
3 x N
12
÷
÷
÷
÷
÷
÷
÷
è
÷
è
HS
LS
ILrms
I
_ rms+ I
_ rms
CPRI_rms
I
= ILrms
PRI
CPRI_ch
CPRI
IL
_pospk
D + (1 - D) x
IL
_pospk - IL
_negpk
I
IL
_pospk x
3
PRI
CPRI
PRI
SW
IL
_pospk
D
(1 - D)
t
+
x
f
IL
_pospk - IL
_negpk
CPRI_ch
CPRI
PRI
I
× t
C
V
=
D
SLVSAV0A
– APRIL 2011 – REVISED JUNE 2011
(17)
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(20)
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(21)
PRIMARY SIDE CAPACITOR
The
ΔVPRI voltage should be less than 10% of VPRI. The rated RMS current of CPRI should be greater than
Equation 22. It is desirable to have a larger primary capacitance to minimize ripple but this will slow the transient
response. For this design example, assuming the
ΔVPRI is 0.22 V, the primary side capacitance is 4.74 F and
the rms current is 1.04 A. A 4.7
F/10V X5R ceramic capacitor is used.
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(22)
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(25)
Copyright
2011, Texas Instruments Incorporated
17
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