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參數(shù)資料
| 型號： | MB3789PFV |
| 廠商： | FUJITSU LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 0.07 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 214K |
| 代理商： | MB3789PFV |
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16
MB3789
I
SETTING THE DEAD TIME
When the device is set for step-up inverting 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 12) from the V
REF
voltage so you can set the output transistor’s dead
time (maximum ON-duty period) as shown in Figure 7 below.
Setting the dead time
1.
When setting the dead time, use resistors as shown in Figure 7 to connect the V
REF
and DTC pins to GND. When
the voltage at the DTC pin (pin 12) is lower than the sawtooth wave output voltage from the oscillator, the output
transistor is turned off.
To set the dead time, see “Duty vs. DTC pin voltage” (in “
I
STANDARD CHARACTERISTIC CURVES”).
2.
Connection without setting the dead time
If you do not set the dead time, connect the V
REF
and DTC pins as shown in Figure 8.
V
dt
=R1 + R2
×
V
REF
R2
2
R2
V
dt
12 DTC
V
REF
R1
2
12 DTC
V
REF
Figure 7 Connection for setting the dead time
Figure 8 Connection without setting the dead time
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