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參數(shù)資料
| 型號(hào)： | EV3213DH-00A |
| 廠商： | Monolithic Power Systems, Inc. |
| 英文描述： | 700KHz/1.3MHz Boost Converter with a 3.5A Switch |
| 中文描述： | 700KHz/1.3MHz可以顯著提高3.5A的開(kāi)關(guān)轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 6/10頁(yè) |
| 文件大小： | 465K |
| 代理商： | EV3213DH-00A |
MP3213 – 700KHZ/1.3MHZ BOOST CONVERTER WITH A 3.5A SWITCH
MP3213 Rev. 1.1
5/12/2006
www.MonolithicPower.com
6
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
At the beginning of each cycle, the N-Channel
MOSFET switch is turned on, forcing the
inductor current to rise. The current at the
source of the switch is internally measured and
converted to a voltage by the current sense
amplifier. That voltage is compared to the error
voltage at COMP. The voltage at the output of
the error amplifier is an amplified version of the
difference between the 1.25V reference voltage
and the feedback voltage. When these two
voltages are equal, the PWM comparator turns
off the switch forcing the inductor current to the
output capacitor through the external rectifier.
This causes the inductor current to decrease.
The peak inductor current is controlled by the
voltage at COMP, which in turn is controlled by
the output voltage. Thus the output voltage is
regulated by the inductor current to satisfy the
load. The use of current mode regulation
improves transient response and control loop
stability.
APPLICATION INFORMATION
Components referenced below apply to Typical Application Circuit on page 1.
Selecting the Soft-Start Capacitor
The MP3213 includes a soft-start timer that
limits the voltage at COMP during startup to
prevent excessive current at the input. This
prevents fault tripping of the input voltage at
startup due to input current overshoot. When
power is applied to the MP3213, and enable is
asserted, a 6μA internal current source charges
the external capacitor at SS. As the SS
capacitor is charged, the voltage at SS rises.
The MP3213 internally clamps the voltage at
COMP to 700mV above the voltage at SS. The
soft-start ends when the voltage at SS reaches
0.45V. This limits the inductor current at startup,
forcing the input current to rise slowly to the
current required to regulate the output voltage.
The soft-start period is determined by the
equation:
SS
SS
C
7
t
×
=
Where C
SS
(in nF) is the soft-start capacitor
from SS to GND, and t
SS
(in
μ
s) is the soft-start
period.
Determine the capacitor required for a given
soft-start period by the equation:
SS
SS
t
×
0133
.
C
=
Setting the Output Voltage
Set the output voltage by selecting the resistive
voltage divider ratio. Use 10k
for the low-side
resistor R2 of the voltage divider. Determine the
high-side resistor R1 by the equation:
FB
FB
OUT
V
)
V
V
(
R
1
R
=
where V
OUT
is the output voltage.
For R2 = 10k
and V
FB
= 1.25V, then
R1 (k
) = 8k
(V
OUT
– 1.25V).
Selecting the Input Capacitor
An input capacitor (C1) is required to supply the
AC ripple current to the inductor, while limiting
noise at the input source. A low ESR capacitor
is required to keep the noise at the IC to a
minimum. Ceramic capacitors are preferred, but
tantalum or low-ESR electrolytic capacitors may
also suffice.
Use an input capacitor value greater than
4.7μF. The capacitor can be electrolytic,
tantalum or ceramic. However since it absorbs
the input switching current it requires an
adequate ripple current rating. Use a capacitor
with RMS current rating greater than the
inductor ripple current (see Selecting The
Inductor to determine the inductor ripple
current).
To ensure stable operation, place the input
capacitor as close to the IC as possible.
Alternately a smaller high quality ceramic 0.1μF
capacitor may be placed closer to the IC with
the larger capacitor placed further away. If
using this technique, the larger capacitor can be
a tantalum or electrolytic type. All ceramic
capacitors should be placed close to the
MP3213.
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