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參數(shù)資料
| 型號： | 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)： | 11/22頁 |
| 文件大?。?/td> | 366K |
| 代理商： | M51996AP |
SWITCHING REGULATOR CONTROL
M51996AP/FP
MITSUBISHI (Dig./Ana. INTERFACE)
( 11
(2)Oscillator operation when the SOFT(soft
start) circuit is operating.
Output transistor is protected from rush current by CLM function
at the start time of power on.SOFT terminal is used to improve
the rising response of the output voltage of power
supply(prevention of overshooting).
The ON duration of output is kept constant,and the OFF
duration is extended as the SOFT terminal voltage becomes
lower by the soft start circuit of this IC.
The maximum value of extension is set internally at
approximately sixteen times of the maximum ON duartion.
The features of this method are as follows:
1 It is ideal for primary control as IC driving current is supplied
from the third widing of the main transformer at the start-up
because constant ON duration is obtained from start-up.
2 It is possible to get a wide dynamic range for ON/OFF ratio
by pulse-by-pulse current limit circuit.
3 The response characteristics at power-on is not affected by
input voltage as the pulse-by-pulse limit current value is not
affected by the input voltage.
Fig.6 shows the circuit diagram of the soft start.If SOFT terminal
voltage is low,T-OFF terminal voltage bocomes low and V
T-OFF
in equations (3) and (4) become low.
Fig.7 Oscillator waveform when the SOFT circuit is
operating
V
OH
V
OL
V
OSCH
4.4V
~
V
OSCL
2.0V
~
Fig.8 Relationship between oscillator waveform and
output waveform at start-up
V
OH
V
OL
V
OSCH
V
OSCL
0
START FROM 0V
THE FIRST
OUTPUT PULSE
NO OUTPUT
PULSE
0
PWM comparator, PWM latch and current limit
latch section
Fig.9 shows the scematic diagram of PWM comparator and
PWM latch section. The on-duration of output waveform
coincides with the rising duration of CF terminal waveform,when
the no output current flows from F/B terminal.
When the F/B terminal has finite impedance and current flows
out from F/B terminal,"A" point potential shown in Fig.9 depends
on this current.So the "A" point potential is close to GND level
when the flow-out current becomes large.
"A" point potential is compared with the CF terminal oscillator
waveform and PWM comparator,and the latch circuit is set
when the potential of oscillator waveform is higher than "A"
point potential.
The latch circuit is reset during the dead-time of oscillation
(falling duration of oscillation current).So the "B" point potential
or output waveform of latch circuit is the one shown in Fig.10.
The final output waveform or "C" point potential is got by
combining the "B" point signal and dead-time signal
logically.(please refer to Fig.10)
C
SOFT
Vz~
Fig.6 Circuit diagram of SOFT terminal section and T-
OFF terminal section
DISCHARGING TRANSISTOR*
IC's INTERNAL CIRCUIT
*Active when operation stops.
GND
TERMINAL
T-OFF
TERMINAL
R
SOFT
SOFT
TERMINAL
TO REG
TERMINAL
Fig.7 shows the relationship between oscillator waveform and
output pulse.
If the SOFT terminal voltage is V
SOFT
,the rise rate of CF
terminal given as
The fall rate of oscillation waveform is given as
where
V
SOFT
;SOFT terminal applied voltage
V
BE
~ 0.65V
If V
SOFT
- V
BE
< 0, V
SOFT
- V
BE
= 0
If V
SOFT
- V
BE
> V
T
-
OFF
(~3.5V), V
SOFT
- V
BE
=V
T
-
OFF
~
R
ON
C
F
V
T
-
ON
(V/S) ..............................................................(5)
~
R
ON
C
F
V
T
-
ON
16 R
ON
C
F
(V/S)
V
SOFT
- V
BE
+
.............................(6)
TO REG
TERMINAL
t
t
t
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| M51996FP | 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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