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MP2235 数据表(PDF) 14 Page - Monolithic Power Systems

部件名 MP2235
功能描述  High-Efficiency, 3A, 16V, 800kHz Synchronous, Step-Down Converter
Download  21 Pages
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制造商  MPS [Monolithic Power Systems]
网页  http://www.monolithicpower.com
标志 MPS - Monolithic Power Systems

MP2235 数据表(HTML) 14 Page - Monolithic Power Systems

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MP2235
– SYNCHRONOUS STEP-DOWN CONVERTER
crossover frequency below one-tenth of the
switching frequency.
To optimize the compensation components, the
following procedure can be used.
1. Choose high-side feedback resistor R1 and
calculate the value of low-side resistor R2
according to desired output voltage. Suggest
choosing R1 around 40kΩ for >1.2V output
condition.
2. Choose the T-Type resistor RT to set the
desired crossover frequency. Determine the RT
value by the following equation:
FB
Z
1
2
T
OUT
i
C
OUT
1
2
V
R
R
R
R
V
R
2
f
C
R
R


   
RZ is the internal compensation resistor, which
equals to 300kΩ. f
C
is the desired crossover
frequency which is typically one tenth of the
switching frequency. Ri is the current sense
resistance, 0.22Ω.
3. Choose feed forward capacitor CF to achieve
sufficient phase margin especially for large
output inductor condition. In theory there is no
need to add type III zero for peak current mode
control, but in real circuit there are some parasitic
capacitors or filters internal which induces poles
into the control loop. Fortunately, those poles are
locating at high frequency range which won’t
affect the step 2 bandwidth calculation while it
affects the phase margin. For applications with
typical inductor values (<4.7µH), setting the
compensation zero, fZ3 (formed by R1 and CF)
around 1.5 times of crossover frequency fC. Then
the CF value can be calculated by following
equation:
F
1C
1
C
3
R
f

If electrolytic capacitor is used or the output
capacitor has large ESR, the feed forward
capacitor CF is not needed any more since there
is already one ESR zero in the loop.
If large output inductor is used, like 22µH, the
phase margin will decrease a lot due to the half
switching
frequency
pole
moves
towards
crossover
frequency.
In
th
is condition, it’s
suggested increasing feed forward capacitor
value of CF to get enough phase margins while
it’s better to keep the feed forward zero
frequency
higher
than
half
of
crossover
frequency.
Figure 7: T-Type Network
Table 1 lists the recommended resistors and
compensation
values
for
common
output
voltages (refer to Figure 7).
Table 1: Resistor Selection for Common Output
Voltages
VOUT
(V)
R1 (kΩ)
R2 (kΩ) Rt (kΩ) Cf(pF) L(μH)
1
20.5
84.5
34
33
1
1.2
30.1
61.9
24
33
1
1.8
40.2
32.4
15
33
2.2
2.5
40.2
19.1
6.8
33
2.2
3.3
40.2
13
5.6
33
3.3
5
40.2
7.68
2
33
3.3
For more accurate control loop design, visit MPS
website and run the online bode plot simulation
by DC/DC designer.
Selecting the Inductor
Use a 1µH-to-22µH inductor with a DC current
rating of at least 25% percent higher than the
maximum load current for most applications. For
highest efficiency, use an inductor with a DC
resistance
less than 15mΩ. For most designs,
the inductance value can be derived from the
following equation.
OUT
IN
OUT
1
IN
L
OSC
V
(V
V
)
L
V
I
f

  
Where ΔI
L is the inductor ripple current.


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