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參數(shù)資料
| 型號(hào)： | TCV7104FN |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1800 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 X 3 MM, 0.65 MM PITCH, PLASTIC, SON-8 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 272K |
| 代理商： | TCV7104FN |
TCV7104FN
2010-03-23
6
Application Notes
Inductor Selection
The inductance required for inductor L can be calculated as follows:
IN
OUT
L
OSC
OUT
IN
V
I
f
V
L
Δ
=
(1)
VIN: Input voltage (V)
VOUT: Output voltage (V)
fOSC: Oscillation frequency = 1500 kHz (typ.)
ΔIL: Inductor ripple current (A)
*: Generally,
ΔIL should be set to approximately 30% of the maximum output current. Since the maximum
output current of the TCV7104FN is 2.0 A,
ΔIL should be 0.6 A or so. The inductor should have a current
rating greater than the peak output current of 2.3 A. If the inductor current rating is exceeded, the inductor
becomes saturated, leading to an unstable DC-DC converter operation.
When VIN = 5 V and VOUT = 3.3 V, the required inductance can be calculated as follows. Be sure to select an
appropriate inductor, taking the input voltage range into account.
IN
OUT
L
OSC
OUT
IN
V
I
f
V
L
Δ
=
V
5
V
3.3
0.6A
1500kHz
V
3.3
V
5
=
(2)
= 1.25μH
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 (0.8 V typ.), which is connected to the Feedback pin, VFB.
RFB1 should be up to 30 kΩ or so, because an extremely large-value RFB1 incurs a delay due to parasitic
capacitance at the VFB pin. 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
LX
VFB
R
FB1
R
FB2
VOUT
Δ
I L
IL
OSC
f
1
T
=
IN
OUT
ON
V
Τ
T
=
0
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