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參數(shù)資料
| 型號(hào)： | MB3827PFV |
| 廠商： | FUJITSU LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down |
| 中文描述： | 0.2 A SWITCHING CONTROLLER, 800 kHz SWITCHING FREQ-MAX, PQFP64 |
| 封裝： | PLASTIC, LQFP-64 |
| 文件頁(yè)數(shù)： | 32/41頁(yè) |
| 文件大?。?/td> | 557K |
| 代理商： | MB3827PFV |
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MB3827
32
I
METHOD OF SETTING THE DEAD TIME
When setting step-up/step-down switching, Zeta type, or fly-back type step-up or inverter output, the output
transistor at start-up is in full-on (ON duty cycle = 100%) state. To prevent this, the DTC voltage from the DTC1-
1 terminal (pin 43) to the DTC6 terminal (pin 15) voltage is determined from the VREF voltage, as shown in
following figure , so that the output transistor dead time (the maximum value of the ON interval) can be set easily.
When the voltage on the DTC5 and DTC6 terminals is lower than the triangular-wave output voltage from the
oscillator, the output transistor turns off. The dead time calculation formula assuming that triangular-wave am-
plitude : 0.7
V
and triangular-wave maximum voltage : 1.8 V is given below.
When you do not use these DTC5 and DTC6 terminals, connect then to VREF terminal (pin 24) as shown
following figure (Not setting the channel 5,6 dead time).
Vdt
1.1
0.7
Rb
DUTY(ON)max :
×
100[%], Vdt
=
×
VREF
Ra
+
Rb
24
16
VREF
DTC5
Ra
Rb
Vdt
24
15
VREF
DTC6
Ra
Rb
Vdt
Setting the channel 5, 6 dead time (same as for other channels)
16
VREF
DTC5
15
VREF
DTC6
24
24
Not setting the channel 5,6 dead time (same as for other channels)
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相關(guān)代理商/技術(shù)參數(shù) |
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