參數(shù)資料
型號(hào)： TPS53314RGFR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 1070 kHz SWITCHING FREQ-MAX, PQCC40
封裝： 5 X 7 MM, GREEN, PLASTIC, VQFN-40
文件頁(yè)數(shù)： 16/29頁(yè)
文件大?。?/td> 800K
代理商： TPS53314RGFR
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-
-
=
=
IN
OUT
IN
OUT
max
SW
IN
OUT
SW
IN(max)
IND ripple
max
V
1
3
L
I
f
V
I
f
V
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( )
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(
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-
=
+
IN
OUT
max
TRIP
IND peak
SW
IN
DS on
max
V
1
I
8
R
L
f
V
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( )
(
)
(
)
( )
-
=
W
OUT
SW
IND ripple
V
10 mV
(1
D)
10 mV
L
f
L
f
ESR
0.6 V
I
0.6 V
60
(
)
-
=
IND ripple
OUT
I
ESR
V
0.6
2
R1
R2
0.6
SLUSAK3
– MAY 2011
External Parts Selection
The external components selection is a simple process using D-CAP
Mode.
1. CHOOSE THE INDUCTOR
The inductance value should be determined to give the ripple current of approximately 1/4 to
of maximum
output current. Larger ripple current increases output ripple voltage and improves signal-to-noise ratio and
helps stable operation.
(6)
The inductor requires a low DCR to achieve good efficiency. It also requires enough room above peak
inductor current before saturation. The peak inductor current can be estimated in Equation 7.
(7)
2. CHOOSE THE OUTPUT CAPACITOR(S)
When organic semiconductor capacitor(s) or specialty polymer capacitor(s) are used, for loop stability,
capacitance and ESR should satisfy Equation 2. For jitter performance, Equation 8 is a good starting point to
determine ESR.
where
D is the duty factor
tSW is the switching period
the required output ripple slope is approximately 10 mV per tSW in terms of VVFB
(8)
3. DETERMINE THE VALUE OF R1 AND R2
The output voltage is programmed by the voltage-divider resistor, R1 and R2 shown in Figure 37. R1 is
connected between VFB pin and the output, and R2 is connected between the VFB pin and GND.
Recommended R2 value is from 10k
Ω to 20kΩ. Determine R1 using Equation 9.
(9)
Copyright
2011, Texas Instruments Incorporated
23
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