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參數(shù)資料
| 型號(hào)： | MB3778P |
| 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： | 0.075 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 15/29頁 |
| 文件大?。?/td> | 276K |
| 代理商： | MB3778P |
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MB3778
15
I
SETTING THE IDLE PERIOD
When voltage step-up, fly-back step-up or inverted output are set, the voltage at the FB terminal may go higher
than the triangular wave voltage due to load fluctuation, etc. In this case the output transistor will be in full-on
state(ON duty 100
%
). This can be prevented by setting the maximum duty for the output transistor. This is done
by setting the DTC1 terminal (pin 6) voltage using resistance division of the V
REF
voltage as illustrated below.
When the DTC1 terminal voltage is higher than the triangular waveform voltage, the output transistor is turned
on. If the triangular waveform amplitude specified by the maximum duty calculation formula is 0.6 V, and the
lower voltage limit of the triangular waveform is 1.3 V, the formula would be as follows (other channels are similar) :
Duty (ON) max (
%
) : (V
dt
1.3 V)
/
0.6 V
×
100, V
dt
(V)
=
Rb
/
(Ra
+
Rb)
×
V
REF
Also, if no output duty setting is required, the voltage should be set greater than the upper limit voltage of the
triangular waveform, which is 1.9 V.
Setting the idle time at DTC1 (DTC2 is similar)
V
REF
Ra
Rb
V
dt
DTC1
16
6
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB3778PF | 制造商:Panasonic Industrial Company 功能描述:IC |
| MB3778PF-E1 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Switching Regulator Controller |
| MB3778PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Switching Regulator Controller |
| MB3778PFV-E1 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Switching Regulator Controller |
| MB-378 | 制造商:Maxxtro 功能描述: |
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