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參數(shù)資料
| 型號： | 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)： | 10/22頁 |
| 文件大小： | 366K |
| 代理商： | M51996FP |
SWITCHING REGULATOR CONTROL
M51996AP/FP
MITSUBISHI (Dig./Ana. INTERFACE)
( / 22 )
10
Start-up circuit section
The start-up current is such low current level as typical 100μ
A,as shown in Fig.3,when the Vcc voltage is increased
from low level to start-up voltage Vcc
(START)
.
In this voltage range,only a few parts in this IC,which has the
function to make the output voltage low level,is alive and
Icc current is used to keep output low level.The large voltage
difference between Vcc
(START)
and Vcc
(STOP)
makes start-up
easy,because it takes rather long duration from Vcc
(START)
to
Vcc
(STOP)
.
Oscillator section
The oscillation waveform is the triangle one.The ON-duration
of output pulse depends on the rising duration of the triangle
waveform and dead-time is decided by the falling duration.
The rising duration is determined by the product of external
resistor R
ON
and capacitor C
F
and the falling duration is mainly
determined by the product of resistor R
OFF
and capacitor C
F
.
(1)Oscillator operation when SOFT circuit does
not operate
Fig.4 shows the equivalent charging and discharging circuit
diagram of oscillator.
The current flows through R
ON
from the constant voltage source
of 5.8V.C
F
is charged up by the same amplitude as R
ON
current,when internal switch SW1,SW2 is switched to "charging
side".The rise rate of C
F
terminal is given as
Vcc
(STOP)
9.9V
Vcc
(START)
16.2V
Icco
11mA
~
Icc
L
100μA
~
SUPPLY VOLTAGE Vcc(V)
Fig.3 Circuit current vs.supply voltage
R
ON
X C
F
V
T
-
ON
(V/s) ................................................(1)
where V
T
-
ON
4.5V
The maximum on duration is approximately given as
(V
OSCH
-V
OSCL
) X R
ON
X C
F
(s)........................(2)
~
V
T
-
ON
C
F
is discharged by the summed-up of R
OFF
current and one
sixteenth (1/16) of R
ON
current by the function of Q2,Q3 and Q4
when SW1,SW2 are switched to "discharge side".
M51996A
SW2
Q2
Q1
5.8V
Q4
1/16
SWITCHED BY
CHARGING AND
DISCHARGING
SIGNAL
DISCHARGING
CHARGING
SW1
T-ON
T-OFF
CF
R
ON
R
OFF
C
F
FROM
VF~
Vz 4.2V
Fig.4 Schematic diagram of charging and discharging
control circuit for OSC.capacitor C
F
Fig.5 OSC.waveform at normal condition (no-
operation of intermittent action and OSC.control
circuit)
V
OH
V
OL
V
OSCH
4.4V
~
V
OSCL
2.0V
~
So fall rate of CF terminal is given as
~
R
OFF
X C
F
The minimum off duration approximately is given as
(V
OSCH
-V
OSCL
) X C
F
V
T
-
OFF
+
16 X R
ON
~
V
T
-
OFF
(V/s)
+
16 X R
ON
X C
F
V
T
-
ON
.....................(3)
R
OFF
V
T
-
ON
(s).....................................(4)
where V
T
-
OFF
3.5V
The cycle time of oscillation is given by the summation of
Equations 2 and 4.
The frequency including the dead-time is not influenced by the
temperature because of the built-in temperature compensating
circuit.
~
~
Q3
~
~
~
where V
OSCH
4.4V
2.0V
V
OSCL
~
~
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| M51996P | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:M51996P |
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| M51997FP | 制造商:MITSUBISHI 制造商全稱:Mitsubishi Electric Semiconductor 功能描述:SWITCHING REGULATOR CONTROL |
| 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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