參數(shù)資料
型號(hào)： MB3883
廠商： Fujitsu Limited
英文描述： 6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down
中文描述： 6通道DC / DC轉(zhuǎn)換集成電路同步的電壓升壓和步驟整風(fēng)式
文件頁(yè)數(shù)： 28/39頁(yè)
文件大小： 473K
代理商： MB3883
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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