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参数资料
| 型号： | TPS62111RSATG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.4 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | GREEN, PLASTIC, QFN-16 |
| 文件页数： | 8/28页 |
| 文件大小： | 842K |
| 代理商： | TPS62111RSATG4 |
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O
I
L
O
L
O
V
1
V
I
V
I max
I
max
L
f
2
-
D
=
=
+
(3)
SLVS585A – JULY 2005 – REVISED FEBRUARY 2009 .................................................................................................................................................... www.ti.com
output capacitor, e.g., for a low-transient output-voltage change. From a stability point of view, the inductor value
could be decreased to keep the L × C product constant. However, there are drawbacks if the inductor value is
decreased. A low inductor value causes a high inductor ripple current, and therefore reduces the maximum dc
output current. Table 2 gives the advantages and disadvantages when designing the inductor and output
capacitor.
Table 2. Advantages and Disadvantages When Designing the Inductor and Output Capacitor
INFLUENCE ON STABILITY
ADVANTAGE
DISADVANTAGE
Less output voltage ripple
Increase Cout (>22 F)
Uncritical
None
Less output voltage overshoot /
undershoot during load transient
Higher output voltage ripple
Critical
High output voltage overshoot /
Decrease Cout (<22 F)
Increase inductor value > 6.8 H
None
undershoot during load
also
transient
Less gain and phase margin
Less inductor current ripple
More energy stored in the
inductor
→ higher voltage
overshoot during load transient
Higher dc output current possible if
Smaller current rise
→ higher
Increase L (>6.8 H)
Uncritical
operated close to the current limit
voltage undershoot during load
transient
→ do not decrease the
value of Cout due to these
effects
Critical
High inductor-current ripple
Small voltage overshoot / undershoot
especially at high input voltage
Decrease L (<6.8 H)
Increase output capacitor value >
during load transient
and low output voltage
22 F also
As shown in Table 2, the inductor value can be increased to higher values. For good performance, the
peak-to-peak inductor-current ripple should be less than 30% of the maximum dc output current. Especially at
input voltages above 12 V, it makes sense to increase the inductor value in order to keep the inductor-current
ripple low. In such applications, the inductor value can be increased to 10 H or 22 H. Values above 22 H
should be avoided in order to keep the voltage overshoot during load transient in an acceptable range.
After choosing the inductor value, two additional inductor parameters should be considered:
1. current rating of the inductor
2. dc resistance
The dc resistance of the inductance directly influences the efficiency of the converter. Therefore, an inductor with
lowest dc resistance should be selected for highest efficiency. In order to avoid saturation of the inductor, the
inductor should be rated at least for the maximum output current plus the inductor ripple current which is
calculated as:
where:
f = Switching frequency (1000 kHz typical)
L = Inductor value
ΔIL = Peak-to-peak inductor ripple current
IL(max) = Maximum inductor current
The highest inductor current occurs at maximum VI. A more-conservative approach is to select the inductor
current rating just for the maximum switch current of the TPS6211x, which is 2.4 A (typically). See Table 1 for
recommended inductors.
16
Copyright 2005–2009, Texas Instruments Incorporated
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