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參數(shù)資料
| 型號： | TB7102F(TE85L,F) |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1150 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 X 3 MM, 0.65 MM PITCH, PLASTIC, SON-8 |
| 文件頁數(shù)： | 15/17頁 |
| 文件大?。?/td> | 253K |
| 代理商： | TB7102F(TE85L,F) |
TB7102F
2009-10-26
7
IN
OUT
L
osc
OUT
IN
V
I
f
V
L
Δ
=
V
5
V
3.3
mA
300
MHz
1
V
3.3
V
5
=
(2)
= 3.7 μH
Figure 2 Inductor Current Waveform
Setting the Output Voltage
A resistive voltage divider is connected as shown in Figure 3 to set the output voltage; it is given by Equation 3
based on the reference voltage of the error amplifier, which is connected to the Feedback pin, VFB. RFB1 should
be up to 10 k
Ω or so, because an extremely large value RFB1 incurs a delay due to parasitic capacitance at the
VFB pin. If the difference between the input and output voltages is small, the output voltage may drop,
depending on the load current conditions. For optimal operation, output voltage should be set to 0.8 V (typ.) at
the minimum and to (VIN 1) V at the maximum. It is recommended that resistors with a precision of ±1% or
higher be used for RFB1 and RFB2.
+
=
FB2
FB1
FB
OUT
R
1
V
+
×
.
=
FB2
FB1
R
1
V
8
0
(3)
Figure 3 Output Voltage Setting Resistors
Output Capacitor Selection
Use a ceramic capacitor as the output filter capacitor. Since a ceramic capacitor is generally sensitive to
temperature, choose one with excellent temperature characteristics (such as the JIS B characteristic). As a rule
of thumb, its capacitance should be 10
μF or greater for applications where VOUT ≥ 2.0 V, and 20 μF or greater
for applications where VOUT < 2.0 V. The capacitance should be set to an optimal value that meets the system's
ripple voltage requirement and transient load response characteristics. Since the ceramic capacitor has a very
low ESR value, it helps reduce the output ripple voltage; however, because the ceramic capacitor provides less
phase margin, it should be thoroughly evaluated.
Component Values (@VIN = 5 V, Ta = 25°C)
These values are presented only as a guide.
The following values may need tuning depending on the TB7102F’s input/output conditions and the board
layout.
Output Voltage
Setting
Inductance
Input Capacitance
Output Capacitance Feedback Resistor
Feedback Resistor
VOUT
L
CIN
COUT
RFB1
RFB2
1.2 V
3.3
μH
10
μF
22
μF
1.2 k
Ω
2.4 k
Ω
1.5 V
3.3
μH
10
μF
22
μF
2.1 k
Ω
2.4 k
Ω
1.8 V
3.3
μH
10
μF
22
μF
3.0 k
Ω
2.4 k
Ω
2.5 V
3.3
μH
10
μF
10
μF
5.1 k
Ω
2.4 k
Ω
3.3 V
3.3
μH
10
μF
10
μF
7.5 k
Ω
2.4 k
Ω
LX
FB
R
FB1
R
FB2
VOUT
Δ
I L
IL
osc
f
1
T
=
IN
OUT
ON
V
Τ
T
=
0
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