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參數(shù)資料
| 型號(hào)： | M51996AP |
| 廠商： | Mitsubishi Electric Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 19/22頁 |
| 文件大?。?/td> | 366K |
| 代理商： | M51996AP |
SWITCHING REGULATOR CONTROL
M51996AP/FP
MITSUBISHI (Dig./Ana. INTERFACE)
( 19
The DC output voltage of SMPS depends on the Vcc voltage of
type M51996A when the polarity of the third winding is negative
and the system is fly back.So the operation of type M51996A
will stop when the Vcc becomes lower than "Operation-stop
voltage" of M51996A when the DC output voltage of SMPS
decreases under specified value at over load condition.
However,the M51996A will non-operate and operate
intermittently,as the Vcc voltage rises in accordance with the
decrease of Icc current.
The fly back system has the constant output power
characteristics as shown in Fig.32 when the peak primary
current and the operating frequency are constant.
Toavoid anincrease of the output current,the frequency is
lowered when the DC output voltage of SMPS starts to drop
using the SOFT terminal.Vcc is divided and is input to the SOFT
terminal as shown in Fig.33,because the voltage in proportional
to the output voltage is obtained from the bias winding.In this
application example,the current flowing to R3 added to the start-
up current.So please use high resistance or 100k
to 200k
for
R3.
The start-up current is not affected by R3 if R3 is connected to
Cvcc2 in the circuit shown in Fig.20.
(b)In case of fly back system
DC OUTPUT CURRENT
POINT THAT Vcc VOLTAGE
OR THIRD WINDING
VOLTAGE DECREASES
UNDER "OPERATION-STOP
VOLTAGE"
Fig.32 Over current limitting curve on fly back system
M51996A
CVcc
Vcc
Fig.33 Current to lower the frequency during the
over current in the fly back system
R3
R4
SOFT
COLLECTOR
The output terminal has the current sink ability even though the
Vcc voltage lower than the "Operation-stop" voltage or Vcc(
STOP
)
(It means that the terminal is "Output low state" and please refer
characteristics of output low voltage versus sink current.)
This characteristics has the merit not to damage the MOS-FIT
at the stop of operation when the Vcc voltage decreases lower
than the voltage of Vcc(
STOP
),as the gate charge of MOS-
FIT,which shows the capacitive load characteristics to the
output terminal,is drawn out rapidly.
The output terminal has the draw-out ability above the Vcc
voltage of 2V,however,lower than the 2V,it loses the ability and
the output terminal potential may rise due to the leakage
current.
In this case, it is recommended to connect the resistor of 100k
between gate and source of MOS-FIT as shown in Fig.34.
(1)The output terminal characteristics at the Vcc voltage
lower than the "Operation-stop" voltage
Output circuit
M51996A
R
CLM
Fig.34 Circuit diagram to prevent the MOS-FIT gate
potential rising
V
OUT
100k
TO MAIN
TRANSFORMER
(2)MOS-FIT gate drive power dissipation
Fig.35 shows the relation between the applied gate voltage
and the stored gate charge.
In the region 1 ,the charge is mainly stored at C
GS
as the
depletion is spread and C
GD
is small owing to the off-state of
MOS-FIT and the high drain voltage.
In the region 2 ,the C
GD
is multiplied by the "mirror effect" as
the characteristics of MOS-FIT transfers from off-state to on-
state.
In the region 3 ,both the C
GD
and C
GS
affect to the
characteristics as the MOS-FIT is on-state and the drain
voltage is low.
The charging and discharging current caused by this gate
charge makes the gate power dissipation.The relation between
gate drive current I
D
and total gate charge Q
GSH
is shown by
following equation;
I
D
=Q
GSH
f
OSC
.....................................(11)
Where
f
OSC
is switching frequency
R1
R2
F/B
REG
To photo-coupler for feed back signal
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M51996FP | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| M51997 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| M51997FP | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| M51997P | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M51996AP(#TF0J) | 制造商:Renesas Electronics Corporation 功能描述: |
| M51996FP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:M51996P |
| M51996P | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:M51996P |
| M51997 | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SWITCHING REGULATOR CONTROL |
| M51997FP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SWITCHING REGULATOR CONTROL |
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