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參數資料
| 型號： | TPS57114QRTERQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, WQFN-16 |
| 文件頁數： | 17/37頁 |
| 文件大小： | 1309K |
| 代理商： | TPS57114QRTERQ1 |
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Tss(ms)
Iss( A)
Css(nF) =
Vref(V)
m
-
Vref
R7 =
R6
Vo
Vref
(
)
(
)
Voutmin
Ontimemin
Fsmax
Vinmax
Ioutmin
2
RDS
Ioutmin
RL
RDS
=
-
-
+
(
) (
)
(
)
Voutmax
1
Offtimemax
Fsmax
Vinmin
Ioutmax
2
RDS
Ioutmax
RL
RDS
=
-
-
-
+
SLVSAH5A
– DECEMBER 2010 – REVISED MARCH 2011
nominal programmed value during power up. This is useful if a load requires a controlled voltage slew rate. This
is also used if the output capacitance is large and would require large amounts of current to quickly charge the
capacitor to the output voltage level. The large currents necessary to charge the capacitor may make the
TPS57114 -Q1 reach the current limit or excessive current draw from the input power supply may cause the
input voltage rail to sag. Limiting the output voltage slew rate solves both of these problems.
The slow start capacitor value can be calculated using Equation 32. For the example circuit, the slow start time is
not too critical since the output capacitor value is 44
μF which does not require much current to charge to 1.8 V.
The example circuit has the slow start time set to an arbitrary value of 4ms which requires a 10 nF capacitor. In
TPS57114 -Q1, Iss is 2.2
μA and Vref is 0.800 V.
(32)
BOOTSTRAP CAPACITOR SELECTION
A 0.1
μF ceramic capacitor must be connected between the BOOT to PH pin for proper operation. It is
recommended to use a ceramic capacitor with X5R or better grade dielectric. The capacitor should have 10 V or
higher voltage rating.
OUTPUT VOLTAGE AND FEEDBACK RESISTORS SELECTION
For the example design, 100 k
was selected for R6. Using Equation 33, R7 is calculated as 80 k. The nearest
standard 1% resistor is 80.5 k
.
(33)
Due to the internal design of the TPS57114 -Q1, there is a minimum output voltage limit for any given input
voltage. The output voltage can never be lower than the internal voltage reference of 0.827 V. Above 0.827 V,
the output voltage may be limited by the minimum controllable on time. The minimum output voltage in this case
is given by Equation 34
Where:
Voutmin = minimum achievable output voltage
Ontimemin = minimum controllable on-time (65 ns typical. 120 nsec no load)
Fsmax = maximum switching frequency including tolerance
Vinmax = maximum input voltage
Ioutmin = minimum load current
RDS = minimum high side MOSFET on resistance (15 - 19 m
)
RL = series resistance of output inductor
(34)
There is also a maximum achievable output voltage which is limited by the minimum off time. The maximum
output voltage is given by Equation 35
Where:
Voutmax = maximum achievable output voltage
Offtimeman = maximum off time (60 nsec typical)
Fsmax = maximum switching frequency including tolerance
Vinmin = minimum input voltage
Ioutmax = maximum load current
RDS = maximum high side MOSFET on resistance (19 - 30 m
)
RL = series resistance of output inductor
(35)
24
Copyright
2010–2011, Texas Instruments Incorporated
Product Folder Link(s): TPS57114 -Q1
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