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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)： | 14/22頁 |
| 文件大?。?/td> | 366K |
| 代理商： | M51996FP |
SWITCHING REGULATOR CONTROL
M51996AP/FP
MITSUBISHI (Dig./Ana. INTERFACE)
( / 22 )
14
Just after the start-up,the Icc current is supplied from
Cvcc,however,under the steady state condition ,IC will be
supplied from the third winding or bias winding of
transformer,the winding ratio of the third winding must be
designed so that the induced voltage may be higher than the
operation-stop voltage Vcc
(STOP)
.
The Vcc voltage is recommended to be 12V to 17V as the
normal and optimum gate voltage is 10 to 15V and the output
voltage(V
OH
) of type M51996AP/FP is about(Vcc-2V).
It is not necessary that the induced voltage is settled higher
than the operation start-up voltage Vcc
(START)
,and the high gate
drive voltage causes high gate dissipation,on the other hand,too
low gate drive voltage does not make the MOS-FET fully on-
state or the saturation state.
SUPPLY VOLTAGE Vcc(V)
0
10
20
30
40
0
Ta=85°C
Ta=25°C
Ta=-30°C
OVP RESET POINT
8.87V(-30°C)
8.94V(25°C)
9.23V(85°C)
1
2
3
4
5
6
7
8
Fig.16 CIRCUIT CURRENT VS. SUPPLY VOLTAGE
(OVP OPERATION)
M51996A
GND
Vcc
R1
VF
CVcc
THIRD WINDING OR
BIAS WINDING
MAIN TRANSFORMER
RECTIFIED DC
VOLTAGE FROM
SMOOTHING CAPACITOR
Fig.24 Start-up circuit diagram when it is not
necessary to set the start and stop input voltage
It is required that the output circuit have the high sink and
source abilities for MOS-FET drive.It is well known that the
"totempole circuit has high sink and source ability.However,it
has the demerit of high through current.
For example,the through current may reach such the high
current level of 1A,if type M51996A has the "conventional"
totempole circuit.For the high frequency application such as
higher than 100kHz,this through current is very important factor
and will cause not only the large Icc current and the inevitable
heat-up of IC but also the noise voltage.
This IC uses the improved totempole circuit,so without
deteriorating the characteristic of operating speed,its through
current is approximately 100mA.
Output section
Fig.17 shows one of the example circuit diagram of the start-up
circuit which is used when it is not necessary to set the start
and stop voltage.
It is recommended that the current more than 300μA flows
through R1 in order to overcome the operation start-up current
Icc
(START)
and Cvcc is in the range of 10 to 47μF.The product of
R1 by Cvcc causes the time delay of operation,so the response
time will be long if the product is too much large.
APPLICATION NOTE OF TYPE M51996AP/FP
Design of start-up circuit and the power supply
of IC
(1)The start-up circuit when it is not necessary to set the
start and stop input voltage
M51996A
GND
Vcc
R1
V
F
CVcc
THIRD WINDING OF
TRANSFORMER
PRIMARY WINDING
OF TRANSFORMER
RECTIFIED DC
VOLTAGE FROM
SMOOTHING CAPACITOR
Fig.18 Start-up circuit diagram when it is not
necessary to set the start and stop input voltage
N
P
N
B
V
IN
R2
It is recommend to use the third winding of "forward winding"
or "positive polarity" as shown in Fig.18,when the DC source
voltages at both the IC operation start and stop must be
settled at the specified values.
The input voltage(V
IN(START)
),at which the IC operation
starts,is decided by R1 and R2 utilizing the low start-up
(2)The start-up circuit when it is not necessary to set the
start and stop input voltage
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