參數(shù)資料
型號(hào)： HA16107P
廠商： Hitachi,Ltd.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： Isolated Flyback Switching Regulator with 9V Output
中文描述： 隔離反激式開(kāi)關(guān)穩(wěn)壓9V輸出
文件頁(yè)數(shù)： 8/38頁(yè)
文件大?。?/td> 170K
代理商： HA16107P
HA16107P/FP, HA16108P/FP
8
3. Programming of Maximum ON-Duty (Du Max)
The preceding equations should be used to program the deadband or maximum ON-duty. The
following table gives a summary.
Condition
R
T1
> R
T2
R
T1
= R
T2
R
T1
< R
T2
Triangle
waveform
Du max
Note:
Less than 50%
50%
Greater than 50%*
In a primary-control switching regulator, Du Max > 50% is dangerous because the transformer will
saturate.
Soft Start and Quick Shutdown
One purpose of the soft-start function is to protect the switching controller and power MOSFET from
surges at power-up. Another purpose is to let the secondary-side DC voltage rise smoothly.
When power goes off, the quick-shutdown function rapidly discharges the capacitor in the soft-start circuit
(and at the same time switches the PWM output off) to prepare for the next power-on.
The soft-start function in these ICs lets the PWM output develop smoothly from zero to the designated
pulse width at power-up. The soft-start voltage is the 3.8 V voltage value of an internal Zener diode, so the
PWM output is able to start widening gradually as soon as the soft-start function starts operating. The soft-
start function will start promptly even if C
ST
is large.
The soft-start and quick-shutdown modes are selected automatically in the IC, under control of the UVL
signal.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HA16107P-E 制造商:Renesas Electronics Corporation 功能描述:Pwr management,SW Reg.Control
HA16108FP 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:600kHz PWM Switching Regulator Controller
HA16108FP-E 制造商:RENE 功能描述:
HA16108FP-EL-E 制造商:Renesas Electronics Corporation 功能描述:
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