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(kāi)關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 18/22頁(yè)
文件大?。?/td> 366K
代理商： M51996AP
SWITCHING REGULATOR CONTROL
M51996AP/FP
MITSUBISHI (Dig./Ana. INTERFACE)
( / 22 )
18
Fig.30 Method to control the knee point of
frequency drop
V
OUT
V
OUT
V
OUT
TO MAKE THE KNEE POINT HIGH
TO MAKE THE KNEE POINT LOW
M51996A
CVcc
Vcc
Fig.29 Current to lower frequency during over current
R3
SOFT
COLLECTOR
R1
R2
F/B
REG
PHOTO-COUPLER
FOR FEED BACK SIGNAL
REG
F/B
500
3K
1S
6S
M51996A
Fig.28 Relationship between REG terminal and
F/B terminal
If the curve becomes vertical because of an excess current, the
output voltage is lowered and no feedback current flows from
feedback photo-coupler;the PWM comparator operates to
enlarge the duty sufficiently,but the signal from the CLM+
section operates to make the pulse width narrower.
Under the condition in which I2 in Fig.26 does not become 0,the
output voltage is proportional to the product of the input voltage
VIN(primary side voltage of the main transformer) and on duty.If
the bias winding is positive,Vcc is approximately proportional to
VIN.The existance of feed back current of the photo-coupler is
known by measuring the F/B terminal voltage which becomes
less than 2VBE in the internal circuit of REG terminal and F/B
terminal if the output current flows from the F/B terminal.
Fig.29 shows an application example.
Q1 is turned on when normal output voltage is controlled at a
certain value.The SOFT terminal is clampedto a high-level
voltage.If the output voltage decreases and the curve starts to
drop,no feed back current flows,Q1 is turned off and the SOFT
terminal responds to the smoothed output voltage.
It is recommended to use an R1 and R2 of 10k
~30k
.An R3
of 20 to 100k
and C of 1000pF to 8200pF should be used.
To change the knee point of frequency drop,use the circuit in
Fig.30.
To have a normal SOFT start function in the circuit in Fig.29,use
the circuit in Fig.31.It is recommended to use an R4 of 10k
.
Q1
D1
V
OUT
BIAS WINDING OF
THE MAIN TRANSFORMER
C
TO OUTPUT TRANSISTOR
SOFT
SOFT
SOFT
M51996A
CVcc
Vcc
Fig.31 Circuit to use frequency drop during the over
current and normal soft start
R3
SOFT
COLLECTOR
R1
R2
F/B
REG
PHOTO-COUPLER
FOR FEED BACK SIGNAL
Q1
D1
V
OUT
BIAS WINDING OF
THE MAIN TRANSFORMER
C
TO OUTPUT TRANSISTOR
R
SOFT
C
SOFT
Q2
R4
D2
D2
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