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參數(shù)資料
| 型號(hào)： | MB3825APFV |
| 廠商： | FUJITSU LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6-ch DC/DC Converter IC With Synchronous Rectifier |
| 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)： | 29/39頁(yè) |
| 文件大?。?/td> | 465K |
| 代理商： | MB3825APFV |
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MB3825A
29
I
METHOD OF SETTING THE DEAD TIME
When the device is set for step-up inverted output based on the flyback method, the output transistor is fixed to
full-on state (ON-duty = 100 %) at power switch-on.To prevent this problem, you may determine the voltages on the
DTC3 terminal (pin 31) from the V
REF
voltage so you can easily set the output transistor’s dead time (maximum ON-
duty) independently for each channel as shown Figure.12.
When the voltage on the DTC3 terminal is lower than the triangular-wave (CT1) output voltage from the oscillator,
the output transistor turns off. The dead time calculation formula assuming that triangular-wave amplitude : 0.7 V
and triangular-wave maximum voltage : 1.35 V is given below.
When you do not use this DTC3 terminal, connect then to V
REF
terminal (pin 27) as shown Figure.13..
Figure 12. When using DTC to set dead time
Duty (ON)
MAX
:
×
100 [%]
Vdt – 0.65
0.7
27
31
VREF
DTC3
Vdt
Rb
Ra
27
31
VREF
DTC3
Figure 13. When not using DTC to set dead time
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB3827 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down |
| MB3827PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down |
| MB3828 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Pentium DC/DC Converter IC |
| MB3828PFV-G-BND | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Pentium DC/DC Converter IC |
| MB3829 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:System Power Supply IC for Mobile Telephone |
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