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參數(shù)資料
| 型號(hào)： | M51996FP |
| 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)： | 12/22頁 |
| 文件大小： | 366K |
| 代理商： | M51996FP |
SWITCHING REGULATOR CONTROL
M51996AP/FP
MITSUBISHI (Dig./Ana. INTERFACE)
( 12
Fig.9 PWM comparator PWM latch and
current limit latch section
+
-
F/B
CF
FROM
OSC
TO
OUTPUT
POINT C
POINT B
LATCH
CURRENT
PWM
COMP
POINT A
5.8V
M51996
6S
1S
7.1V
~
WAVEFORM AT POINT A
OSC WAVEFORM
WAVEFORM
OF O.S.C. &
POINT A
POINT B
POINT C
Fig.10 Waveforms of PWM comparator input point A,
latch circuit points B and C
OSC WAVEFORM
OF CF TERMINAL
WAVEFORM OF
CLM+ TERMINAL
V
THCLM
200mV
~
CURRENT LIMIT
SIGNAL TO SET
LATCH
WAVEFORM OF
V
OUT
TERMINAL
Current limiting section
When the current-limit signal is applied before the crossing
instant of "A" pint potential and CF terminal voltage shown in
Fig.9,this signal makes the output "off" and the off state will
continue until next cycle.Fig.11 shows the timing relation among
them.
If the current limiting circuit is set,no waveform is generated at
output terminal, however this state is reset during the
succeeding dead-time.
So this current limiting circuit is able to have the function in
every cycle,and is named "pulse-by-pulse current limit".
There happen some noise voltage on R
CLM
during the switching
of power transistor due to the snubber circuit and stray
capacitor of the transformer windings.
To eliminate the abnormal operation by the noise voltage,the
low pass filter,which consists of R
NF
and C
NF
is used as shown
in Fig.12.
It is recommended to use 10 to 100
for R
NF
because such
range of R
NF
is not influenced by the flow-out current of some
200μA from C
LM+
terminal and C
NF
is designed to have the
enough value to absorb the noise voltage.
M51996
V
OUT
CLM+
GND
R
NF
C
NF
R
CLM
Fig.12 Connection diagram of current limit circuit
Voltage detector circuit(DET) section
The DET terminal can be used to control the output voltage
which is determined by the winding ratio of fly back transformer
in fly-back system or in case of common ground circuit of
primary and secondary in feed forward system.
The circuit diagram is quite similar to that of shunt regulator
type 431 as shown in Fig.13.As well known from Fig.13 and
Fig.14,the output of OP AMP has the current-sink ability,when
the DET terminal voltage is higher than 2.5V
*2
*1
*1 Resistor to determine current limit sensitivety
*2 High level during dead time
CLM+
Fig.11 Operating waveform of current limiting circuit
POINT D
POINT
D
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
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| M51997P | 制造商:Panasonic Industrial Company 功能描述:IC |
| M51998FP | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:SWITCHING REGULATOR CONTROL |
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