參數(shù)資料
型號(hào)： TPS53353DQPT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PDSO22
封裝： 5 X 6 MM, ROHS COMPLIANT, PLASTIC, SON-22
文件頁(yè)數(shù)： 14/25頁(yè)
文件大?。?/td> 556K
代理商： TPS53353DQPT
(
)
(
)
-
-
W
÷
÷
÷
è
è
W =
m
IN
OUT
OCP
DS(on)
SW
IN
TRIP
V
1
I
32
R
m
2
L
f
V
R
(k
)
I
( A)
>
OUT
ON
L
C
t
N
R7
C1
2
-
=
IN
OUT
INJ _ SW
SW
V
D
V
R7
C1
f
(
)
(
)
=
+
IND ripple
INJ _ OUT
IND ripple
OUT
SW
I
V
ESR
I
8
C
f
+
=
+
INJ _ SW
INJ _ OUT
VFB
V
0.6
2
-
=
OUT
VFB
V
R1
R2
V
SLUSAK2
– AUGUST 2011
6. CHOOSE THE OVERCURRENT SETTING RESISTOR
The overcurrent setting resistor, RTRIP, can be determined by Equation 10.
where
ITRIP is the TRIP pin sourcing current (10 A)
RDS(on) is the thermally compensated on-time resistance value of the low-side MOSFET
(10)
Use an RDS(on) value of 1.6 mΩ for an overcurrent level of approximately 20 A. Use an RDS(on) value of
1.7 m
Ω for overcurrent level of approximately 10 A.
External Component Selection Using All Ceramic Output Capacitors
When a ceramic output capacitor is used, the stability criteria in Equation 5 cannot be satisfied. The ripple
injection approach as shown in Figure 2 is implemented to increase the ripple on the VFB pin and make the
system stable. In addition to the selections made using steps 1 through step 6 in the External Component
Selection section, the ripple injection components must be selected. The C2 value can be fixed at 1 nF. The
value of C1 can be selected between 10 nF to 200 nF.
where
N is the coefficient to account for L and COUT variation
(11)
N is also used to provide enough margin for stability. It is recommended N=2 for VOUT ≤ 1.8 V and N=4 for VOUT
≥ 3.3 V or when L ≤ 250 nH. The higher VOUT needs a higher N value because the effective output capacitance is
reduced significantly with higher DC bias. For example, a 6.3-V, 22-
F ceramic capacitor may have only 8 F of
effective capacitance when biased at 5 V.
Because the VFB pin voltage is regulated at the valley, the increased ripple on the VFB pin causes the increase
of the VFB DC value. The AC ripple coupled to the VFB pin has two components, one coupled from SW node
and the other coupled from the VOUT pin and they can be calculated using Equation 12 and Equation 13 when
neglecting the output voltage ripple caused by equivalent series inductance (ESL).
(12)
(13)
It is recommended that VINJ_SW to be less than 50 mV. If the calculated VINJ_SW is higher than 50 mV, then other
parameters need to be adjusted to reduce it. For example, COUT can be increased to satisfy Equation 11 with a
higher R7 value, thereby reducing VINJ_SW.
The DC voltage at the VFB pin can be calculated by Equation 14:
(14)
And the resistor divider value can be determined by Equation 15:
(15)
Copyright
2011, Texas Instruments Incorporated
21
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TPS53355DQPR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 HI-EFF,30A,SYNC BUCK CONVERTER RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS53355DQPT 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 HI-EFF,30A,SYNC BUCK CONVERTER RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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