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參數(shù)資料
| 型號： | TCV7101F(TE12L,Q) |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 720 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 5 X 5 MM, 1.27 MM PITCH, PLASTIC, HSON-8 |
| 文件頁數(shù)： | 15/17頁 |
| 文件大?。?/td> | 461K |
| 代理商： | TCV7101F(TE12L,Q) |
TCV7101F
2010-03-18
7
Output Filter Capacitor Selection
Use a low-ESR electrolytic or ceramic capacitor as the output filter capacitor. Since a capacitor is generally
sensitive to temperature, choose one with excellent temperature characteristics. As a rule of thumb, its
capacitance should be 47
μF or greater for applications where VOUT ≥ 2 V, and 100 μF or greater for applications
where VOUT < 2 V. The capacitance should be set to an optimal value that meets the system’s ripple voltage
requirement and transient load response characteristics. The phase margin tends to decrease as the output
voltage is getting low. Enlarge a capacitance for output flatness when phase margin is insufficient, or the
transient load response characteristics cannot be satisfied. 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.
Output filter capacitors with a smaller value mentioned above can be used by adding a phase compensation
circuit to the VFB pin. For example, suppose using three 10 μF ceramic capacitors as output filter capacitors;
then the phase compensation circuit should be programmed as follows:
CP1 (μF) = 2 / RFB1 (Ω) (4)
CP2 (μF) = CP1 (μF) × 10 (5)
RFB2 // RP = RFB1 / 2 (6)
* Set the upper cut-off frequency of CP1 and
RFB1 to approx. 60 kHz (fosc/10). (4)
* Choose the value of CP2 to produce zero-frequency
at 1/10th the upper cut-off frequency. (5)
* If RFB2 is less than half of RFB1, RP and CP2
are not necessary. (6)
(Only CP1 allows programming of VOUT above
1.8 V.)
Figure 4 Phase Compensation Circuit
Examples of Component Values in the Phase Compensation Circuit (For Reference Only)
The following values need tuning, depending on the TCV7101F’s I/O conditions and the board layout.
VOUT
COUT
RFB1
RFB2
RP
CP1
CP2
1.2 V
10
μF × 3
7.5 k
Ω
15 k
Ω
4.7 k
Ω
330 pF
3300 pF
1.51 V
10
μF × 3
16 k
Ω
18 k
Ω
15 k
Ω
150 pF
1500 pF
1.8 V
10
μF × 3
15 k
Ω
12 k
Ω
220 pF
2.5 V
10
μF × 3
5.1 k
Ω
2.4 k
Ω
470 pF
3.3 V
10
μF × 3
7.5 k
Ω
2.4 k
Ω
330 pF
The phase compensation circuit shown above delivers good transient load response characteristics with
small-value output filter capacitors by programming f0 (the frequency at which the open-loop gain is equal to
0 dB) to a high frequency. For output filter capacitors, use low-ESR ceramic capacitors with excellent
temperature characteristics (such as the JIS B characteristic). Although the external phase compensation circuit
improves noise immunity, they should be thoroughly evaluated to ensure that the system’s ripple voltage
requirement and transient load response characteristics are met.
LX
VFB
R
FB1
R
FB2
VOUT
C
P1
C
P2
R
P
C
OUT
30
μF
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