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參數(shù)資料
| 型號： | MC44605P |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RW-S Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 05V; Output Voltage (Vdc): 05V; Power: 2W; DIP24 Low Profile Miniature Package; 1kVDC Isolation; Feedback Regulated Output; 2:1 Wide Range Voltage Input; Continuous Short Circuit Protection; Less than 7mm Height; SMD Pinning Option; Efficiency to 87% |
| 中文描述： | 0.75 A SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 328K |
| 代理商： | MC44605P |
MC44605
http://onsemi.com
8
Summary of the Main Design Equations
The following table consists of equations enabling to dimension a multisynchronized SMPS operating in discontinuous
mode.
Pinmax
Poutmax
η
Poutmax is the maximum power the load may draw in normal working.
The maximum input power Pinmax is easily deducted by dividing Poutmax
by the efficiency (
η
). In this kind of application, the efficiency is generally
taken equal to 80%.
Lpmax
2·Vacmin
2·Vacmin
Pinmax
NVo
NVo
2
fsyncmax
2
The inductor value Lp must be chosen lower than Lpmax or ideally equal to
this value (to optimize the application design–in).
In effect, if Lp was higher than Lpmax, a synchronized and discontinuous
working could not be guaranteed (in some cases, the demagnetization
phase would not be finished while a new conduction phase should start to
follow the synchronization).
Ipkmax
2
Pinmax
fsyncmin
L
Ipkmax is the maximum inductor peak current. This current is obtained
when the power to transfer is maximum at the minimum synchronization
frequency (60 W output, 30 kHz in the proposed application).
dmax
Pinmax
Lp
fsyncmax
Vacmin
dmax is the maximum duty cycle. The duty cycle is maximum at the lowest
input voltage when the power demand is maximum while the
synchronization frequency also is maximum.
Ponmax
1
3
Rdson
Ipkmax2
dmax
Ponmax is the maximum Mosfet on–time losses that are proportional to
Ipkmax, dmax and Rdson (on–time Mosfet resistor).
This conduction losses estimation enables to dimension the power Mosfet.
(VDS)max
2
Vacmax
(N
Vout)
(
VDS)max is the maximum voltage the power switch must be able to face.
In fact, this calculation does not take into account the turnings off spikes.
So, it is necessary to take a margin of at least about 50 V.
(VD)max
2
Vacmax
N
Vout
(VD)max is the maximum voltage the high voltage secondary diode must
be able to face. Because of the turning off spikes, a margin must also be
taken.
(ni)max
N
nVout
Ipkmax
(AL) and (ni) are the magnetic parameters.
(ni)max must not exceed the ferrite (ni). Otherwise, the transformer may get
saturated when the peak current is high.
AL
LP
nVout)2
(N
(AL) is the ferrite constant that links the primary inductor value to the
squared number of primary turns: Lp = AL x np2.
Error Amplifier
A fully compensated Error Amplifier with access to the
inverting input and output is provided. It features a typical
DC voltage gain of 70 dB. The non inverting input is
internally biased at 2.5 V and is not pinned out. The
converter output voltage is typically divided down and
monitored by the inverting input. The maximum input bias
current with the inverting input at 2.5 V is –2.0
μ
A. This can
cause an output voltage error that is equal to the product of
the input bias current and the equivalent input divider source
resistance.
+
1.0 mA
2.5 V
Figure 1. Error Amplifier Compensation
Compensation
RFB
Cf
R1
R2
From Power Supply Output
Rf
13
14
Voltage
Feedback
Input
Error
Amplifier
2R
R
1.0 V
Current
Sense
Comparator
Gnd
4
MC44605
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