參數(shù)資料
型號(hào)： TPS61081DRCTG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 1.3 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO10
封裝： 3 X 3 MM, 1 MM HEIGHT, GREEN, PLASTIC, QFN-10
文件頁(yè)數(shù)： 5/25頁(yè)
文件大小： 925K
代理商： TPS61081DRCTG4
www.ti.com
APPLICATION INFORMATION
PROGRAM OUTPUT VOLTAGE
TPS61080/1
OUT
FB
R1
R2
C 1
R3
100 W
C2
4.7
F
m
R1 + R2
Vout
1.229V *
1
(4)
FEED FORWARD CAPACITOR
Fz +
1
2pR1
C1
(5)
F
P +
1
R1 )
1
R2
1
2pC1
(6)
F
P +
1
2pR2C1
when R1 u u R2.
(7)
SLVS644B – FEBRUARY 2006 – REVISED JANUARY 2007
If the calculated duty cycle is less than 5%, minimum load should be considered to the boost output to ensure
regulation. Figure 19 provides quick reference to identify the minimum load requirements for two input voltages.
Figure 20. Feed Forward Capacitor Connecting With Feedback Resistor Divider
To program the output voltage, select the values of R1 and R2 (See Figure 20) according to the following
equation.
A optimum value for R2 is around 50k
which sets the current in the resistor divider chain to 1.229V/50k =
24.58
A. The output voltage tolerance depends on the V
FB accuracy and the resistor divider.
A feed forward capacitor on the feedback divider, shown in Figure 20, improves transient response and phase
margin. This network creates a low frequency zero and high frequency pole at
The frequency of the pole is determined by C1 and paralleled resistance of R1 and R2. For high output voltage,
R1 is much bigger than R2. So
The loop gains more phase margin from this network when (Fz+Fp)/2 is placed right at crossover frequency,
which is approximately 15kHz with recommended L and C. The typical value for the zero frequency is between
1kHz to 10KHz. For high output voltage, the zero and pole are further apart which makes the feed forward
capacitor very effective. For low output voltage, the benefit of the feed forward capacitor is less visible. Table 2
gives the typical R1, R2 and the feed forward capacitor values at the certain output voltage. However, the
transient response is not greatly improved which implies that the zero frequency is too high or low to increase
the phase margin.
Table 2. Recommended Feed Forward Capacitor
Values With Different Output Voltage
C1(Feed
Output Voltage
R1
R2
Forward)
12V
437k
49.9k
33pF
16V
600k
49.9k
42pF
20V
762k
49.9k
56pF
25V
582k
30.1k
120pF
13
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