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參數(shù)資料
| 型號(hào)： | MB3832A |
| 廠商： | Fujitsu Limited |
| 英文描述： | ECONOLINE: REC5-S_DRW(Z)/H4,H6 - Safety standards and approval: EN 60950 certified, rated for 250VAV (LVD test report)- Applied for Ul 1950 Component Recognised Certification- 5W DIP Package- 4kVDC & 6kVDC Isolation- Regulated Output- Continuous Short Circiut Protection Auto-Restarting |
| 中文描述： | 直流/直流轉(zhuǎn)換器集成電路充電 |
| 文件頁數(shù)： | 17/23頁 |
| 文件大?。?/td> | 219K |
| 代理商： | MB3832A |
17
MB3832A
I
METHODS OF SETTING THE DEAD TIME AND SOFT START
1.
Dead Time
When the device is set for step-up inverted output based on the flyback method, the output transistor is fixed to
a full-ON state (ON duty = 100%) when the power supply is turned on. To prevent this problem, you may determine
the voltage at the DTC pin (pin 16) from the V
REF
voltage so you can set the output transistor’s dead time
(maximum ON-duty period) as shown in Figure a below.
When the voltage at the DTC pin (pin 16) is higher than the triangular wave output voltage from the oscillator,
the output transistor is turned off. The dead time calculation formula assuming that triangular wave amplitude
0.6 V and triangular wave minimum voltage ..
Duty (ON) ..
×
100 [%], V
dt
=
×
V
REF
When the DTC pin is not used, connect it directly to the VREF pin.
2.
Soft Start
To prevent surge currents when the IC is turned on, you can set a soft start using the DTC pin (pin 16). You can
also set a soft start along with the dead time by making connections as shown in Figure d below.
..
0.6 V
V
dt
– 1.3 V
R
1
+ R
2
R
2
1 VREF
16 DTC
R
1
R
2
V
dt
1 VREF
16 DTC
Figure a Setting the dead time
Figure b Not setting the dead time
1 VREF
16 DTC
R
dt
C
dt
1 VREF
16 DTC
R
1
R
2
Cdt
Figure c Setting a soft start
Figure d Setting the dead time and a soft start
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