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| 型号： | MP8650DN-Z |
| 厂商： | MONOLITHIC POWER SYSTEMS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 19 A SWITCHING REGULATOR, 400 kHz SWITCHING FREQ-MAX, QCC20 |
| 封装： | 3 X 4 MM, MO-220VGED, QFN-20 |
| 文件页数： | 6/8页 |
| 文件大小： | 233K |
| 代理商： | MP8650DN-Z |
MP8650 – 15A, 28V, HIGH FREQUENCY STEP-DOWN WITH SYNCHRONOUS GATE DRIVER
MP8650 Rev. 0.2
www.MonolithicPower.com
6
12/13/2007
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2007 MPS. All Rights Reserved.
APPLICATION INFORMATION
Setting the Output Voltage
The external resistor divider is used to set the
output voltage (see the Typical Application
Circuit on the front page). The feedback resistor
R1 also sets the feedback loop bandwidth with
the internal compensation capacitor (see Figure
1). Choose R1 to be around 40.2k for optimal
transient response. R2 is then given by:
1
V
8
.
0
V
1
R
2
R
OUT
=
Table 1—Resistor Selection for Common
Output Voltages
VOUT (V)
R1 (k)
R2 (k)
1.8
40.2 (1%)
32.4 (1%)
2.5
40.2 (1%)
19.1 (1%)
3.3
40.2 (1%)
13 (1%)
5
40.2 (1%)
7.68 (1%)
Selecting the Inductor
A 1H to 10H inductor with a DC current rating
of at least 25% percent higher than the
maximum load current is recommended for
most applications. For highest efficiency, the
inductor DC resistance should be less than
7m. For most designs, the inductance value
can be derived from the following equation.
OSC
L
IN
OUT
IN
OUT
f
I
V
)
V
(
V
L
×
Δ
×
×
=
Where ΔIL is the inductor ripple current.
Choose inductor current to be approximately
30% of the maximum load current, 15A. The
maximum inductor peak current is:
2
I
L
LOAD
)
MAX
(
L
Δ
+
=
Under light load conditions below 200mA, larger
inductance is recommended for improved
efficiency.
Synchronous MOSFET
The external synchronous MOSFET is used to
supply current to the inductor when the internal
high-side switch is off. It reduces the power loss
significantly when compared against a Schottky
rectifier.
Table 2 lists example synchronous MOSFETs
and manufacturers.
Table 2—Diode Selection Guide
Manufacture
Part No.
Siliconix
TBD
IR
TBD
Selecting the Input Capacitor
The input capacitor reduces the surge current
drawn from the input and also the switching
noise from the device. The input capacitor
impedance at the switching frequency should
be less than the input source impedance to
prevent high frequency switching current from
pass to the input. Ceramic capacitors with X5R
or X7R dielectrics are highly recommended
because
of
their
low
ESR
and
small
temperature coefficients. For most applications,
a 22F capacitor is sufficient.
Selecting the Output Capacitor
The output capacitor keeps output voltage small
and ensures regulation loop stability. The
output capacitor impedance should be low at
the switching frequency. Ceramic capacitors
with X5R or X7R dielectrics are recommended.
PC Board Layout
The high current paths (GND, IN and SW)
should be placed very to the device with short,
direct and wide traces. The input capacitor
needs to be as close as possible to the IN and
GND pins. The external feedback resistors
should be placed next to the FB pin. Keep the
switching node SW short and away from the
feedback network.
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