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參數(shù)資料
| 型號： | TCV7100F(TE12L,Q) |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4.2 A SWITCHING REGULATOR, 960 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 5 X 5 MM, 1.27 MM PITCH, PLASTIC, HSON-8 |
| 文件頁數(shù)： | 14/17頁 |
| 文件大小： | 394K |
| 代理商： | TCV7100F(TE12L,Q) |
TCV7100F
2008-06-10
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 = 800 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 TCV7100F is 2.5 A,
ΔIL should be 0.75 A or so. The inductor should have a current
rating greater than the peak output current of 2.9 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
0.75A
800kHz
V
3.3
V
5
=
(2)
= 1.87 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 (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
CFB1 and CFB2 are intended to improve the high-frequency characteristics of the control loop. Component
values should be selected to meet this relationship: RFB1/RFB2 = CFB2/CFB1. As a guide, the series capacitance
of CFB1 and CFB2 should be 500 pF to 1000 pF. If the switching waveform is unstable depending on the output
load conditions, CFB1 and CFB2 may help improve its stability.
Δ
I L
IL
OSC
f
1
T
=
IN
OUT
ON
V
Τ
T
=
0
LX
VFB
R
FB1
R
FB2
VOUT
C
FB1
C
FB2
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