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参数资料
| 型号： | APW7066RC-TRL |
| 厂商： | ANPEC ELECTRONICS CORP |
| 元件分类： | 稳压器 |
| 英文描述： | Dual Synchronous Buck PWM Controllers and One Linear Controller |
| 中文描述： | SWITCHING CONTROLLER, PDSO24 |
| 封装： | LEAD FREE, MO-153ADT, TSSOP-24 |
| 文件页数： | 20/33页 |
| 文件大小： | 338K |
| 代理商： | APW7066RC-TRL |
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Copyright
ANPEC Electronics Corp.
Rev. A.7 - Mar., 2008
APW7066
27
Application Information (Cont.)
Input Capacitor Selection (Cont.)
rating and the RMS current rating. For reliable
operation, select the capacitor voltage rating to be at
least 1.3 times higher than the maximum input voltage.
The maximum RMS current rating requirement is
approximately IOUT/2, where IOUT is the load current.
During power up, the input capacitors have to handle
large amount of surge current. If tantalum capacitors
are used, make sure they are surge tested by the
manufactures. If in doubt, consult the capacitors
manufacturer. For high frequency decoupling, a
ceramic capacitor 1uF can be connected between the
drain of upper MOSFET and the source of lower
MOSFET.
MOSFET Selection
The selection of the N-channel power MOSFETs are
determined by the R
DS(ON), reverse transfer capacitance
(C
RSS) and maximum output current requirement.The
losses in the MOSFETs have two components:
conduction loss and transition loss. For the upper and
lower MOSFET, the losses are approximately given
by the following :
P
UPPER = Iout
2(1+ TC)(R
DS(ON))D + (0.5)(Iout)(VIN)(tsw)FS
P
LOWER = Iout
2(1+ TC)(R
DS(ON))(1-D)
where I
OUT is the load current
TC is the temperature dependency of R
DS(ON)
F
S is the switching frequency
t
sw is the switching interval
D is the duty cycle
Note that both MOSFETs have conduction losses while
the upper MOSFET include an additional transition loss.
The switching internal, t
sw, is a function of the reverse
transfer capacitance C
RSS.
The (1+TC) term is to factor in the temperature
dependency of the R
DS(ON) and can be extracted from
the
“R
DS(ON) vs Tem perature” curve of the power
MOSFET.
Connecting One Input from Another Output
It can be connected one of the 3 outputs as the input
voltage to the 2nd. In these cases the output current
of the first output includes its own load current and the
2nd output
’s load current. Therefore, the components of
the first output must be designed and sized for the
both outputs. The soft-start of first output must be faster
than the 2nd output. If the first output is not present
when the 2nd output tries to start up, the 2nd output
cannot get smooth and controlled output voltage rise,
even cause short-circuit protection.
Short Circuit Protection
The APW 7066 provides a simple short circuit
protection function, and it is not easy to predict its
performance, since many factors can affect how well
it works. Therefore, the limitations and suggestions
of this method must be provided for users to understand
how to work it well.
The short circuit protection was not designed to
work for the output in initial short condition. In this
case, the short circuit protection may not work,
and damage the MOSFETs. If the circuit still works,
remove the short can cause an inductive kick on
the phase pin, and it may damage the IC and
MOSFETs.
If the resistance of the short is not low enough to
cause protection, the regulator will work as the load
has increased, and continue to regulate up until
the MOSFETs is damaged. The resistance of the
short should include wiring, PCB traces,
contact
resistances, and all of the return paths.
The higher duty cycle will give a higher COMP
voltage level, and it is easy to touch the trip point.
The compensation components also affect the
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相关代理商/技术参数 |
参数描述 |
|---|---|
| APW7066RC-TU | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Dual Synchronous Buck PWM Controllers and One Linear Controller |
| APW7066RC-TUL | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Dual Synchronous Buck PWM Controllers and One Linear Controller |
| APW7067N | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Synchronous Buck PWM and Linear Controller |
| APW7067N_08 | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Synchronous Buck PWM and Linear Controller |
| APW7067NKE-TR | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Synchronous Buck PWM and Linear Controller |
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