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參數(shù)資料
| 型號(hào)： | MB3883PV |
| 廠商： | FUJITSU LTD |
| 元件分類(lèi)： | 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, 1000 kHz SWITCHING FREQ-MAX, PBCC48 |
| 封裝： | PLASTIC, BCC-48 |
| 文件頁(yè)數(shù)： | 28/39頁(yè) |
| 文件大小： | 473K |
| 代理商： | MB3883PV |
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MB3883
28
I
SETTING THE DEAD TIME
When the device is set for step-up inverted output based on the step-up or step-up/down Zeta method or flyback
method, the FB pin voltage may reach and exceed the rectangular wave voltage due to load fluctuation. If this
is the case, the output transistor is fixed to a full-ON state (ON duty = 100 %). To prevent this, set the maximum
duty of the output transistor. To set it, set the voltage at the DTC1 terminal (pin 36) by applying a resistive voltage
divider to the VREF voltage as shown below.
When the voltage at the DTC1 terminal (pin 36) is higher than the triangular wave voltage (CT1), the output
transistor is turned on. The maximum duty calculation formula assuming that triangular wave amplitude : 0.7
V and triangular wave minimum voltage : 1.1 V is given below. (Same to other channels.)
DUTY (ON) max : Vdt
1.1 V
0.7 V
When the DTC1 terminal is not used, connect it directly to the VREF terminal (pin 16) as shown below (when
no dead time is set). (Same to other channels.)
When using DTC to set dead time
(Same to other channels.)
( CH1)
When no dead time is set
( Same to other channels.)
( CH 1)
×
100 (%) , Vdt
=
Rb
Ra
+
Rb
×
VREF
16
36
VREF
DTC1
Ra
Rb
Vdt
16
36
VREF
DTC1
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相關(guān)代理商/技術(shù)參數(shù) |
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| MB3885 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:1-channel DC/DC Converter IC with Synchronous Rectifier |
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| MB3886 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type |
| MB3886PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type |
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