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參數(shù)資料
| 型號： | MB3881PFF |
| 廠商： | FUJITSU LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8-ch DC/DC Converter IC with Synchronous Rectifier 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 |
| 文件頁數(shù)： | 29/40頁 |
| 文件大?。?/td> | 509K |
| 代理商： | MB3881PFF |
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MB3881
29
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 48) by applying a resistive voltage
divider to the VREF voltage as shown below.
When the voltage at the DTC1 terminal (pin 48) is higher than the triangular wave voltage (CT1), the output
transistor is turned on. The maximum duty calculation formula assuming that triangular wave amplitude : 0.73
V and triangular wave minimum voltage : 1.0 V is given below. (Same to other channels.)
When the DTC1 terminal (pin 48) is not used, connect it directly to the VREF terminal (pin 24) as shown below.
(Same to other channels.)
When using DTC to set dead time
(Same to other channels.)
( CH1)
When no soft start time is set
( Same to other channels.)
( CH 1)
DUTY (ON) max : Vdt
1.0 V
0.73 V
×
100[%], Vdt
=
Rb
Ra
+
Rb
×
VREF
24
48
VREF
Ra
Rb
Vdt
DTC1
24
48
VREF
DTC1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB3881PFF-G-BND-E1 | 制造商:Fujitsu 功能描述:u[Xg/tCobN/obN/] 8 1.8V to 13V 64LQFP Tray |
| MB3881PMC2-G-BNDE1 | 制造商:Fujitsu 功能描述:Bulk |
| MB3882 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:2-channel DC/DC Converter IC with Synchronous Rectifier |
| MB3882PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:2-channel DC/DC Converter IC with Synchronous Rectifier |
| MB3882PFV-G-BND(E1) | 制造商:Fujitsu 功能描述: |
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