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参数资料
| 型号： | FA5311BP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封装： | DIP-8 |
| 文件页数： | 2/17页 |
| 文件大小： | 263K |
| 代理商： | FA5311BP |
10
FA531X series
(2) Startup circuit connected to rectified line
This method is not suitable for FA531X, especially concerned
with re-startup operation just after power-off or startup which
AC input voltage goes up slowly. Fig. 21 shows a startup
circuit that a startup resistor RA is connected to rectified line
directly.
The period from power-on to startup is determined by RA, RB
and CA. RA, RB and CA must be designed to satisfy the
following equations.
dVcc/dt(V/s)=
(1/CA){( VIN –Vccon )/RA– Vccon/RB–Iccst } >
1.8/(Cs(
F))..........................................(8)
RA(k
) < ( VIN– 9.2(V) )/{ 0.4(mA) + ( 9.2(V)/RB(k) ) }....(9)
VIN :
2 (AC input effective voltage)
After power-off, once VCC falls down below OFF threshold
voltage, VCC rises up again and re-startup occurs while the
capacitor C1 is discharged until approximately zero because
VCC voltage rises up by the current flowing RA.
This operation is repeated several times.
After the repeated operation, IC stops in the condition that VCC
voltage is equal to Vccon (=ON threshold) because capacitor
C1 is discharged gradually and the decreased VCC inclination
is out of the condition required by equation (4). After that, re-
startup by power-on can not be guaranteed even when
equation (8) is satisfied.
The image of that the startup is impossible is shown in Fig. 22.
It is necessary to startup IC that supply current Icc(startup) to
VCC is over 4mA in the condition of Tj < 100
°C during Vcc is
kept at Vccon( 16V, balance state at Vccon after the repeated
operation.
Icc(start-up) > 4mA
at Vcc=Vccon, Tj<100
°C, after power-off
This balance state that startup is impossible tends to occur at
higher temperature. If power-on is done when Vcc is not kept
at Vccon (for example:power-off is done and after enough time
that C1 is discharged until Vcc can not be pulled up to Vccon),
the IC can startup in the condition given by equation(8).
In some cases, such as when the load current of power supply
is changed rapidly, you may want to prolong the hold time of
the power supply output by means of maintaining Vcc over the
off threshold.
For this purpose, connect diode D4 and electrolytic capacitor
C4 as shown in Fig. 23. This prolongs the hold time of the
power supply voltage Vcc regardless of the period from power-
on to startup.
Fig. 21 Startup circuit example(2)
Fig. 22 A image of waveform when re-startup is impossible
Fig. 23 Startup circuit example(3)
Startup is impossible
Power ON
Power OFF
Vccon
Vccoff
Startup is impossible (dVcc/dt <1.8/Cs
just before Vcc reaches Vccon).
Icc>4mA is necessary for startup at
Tj <100
°C and dVcc/dt=0.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FA5311BP(S) | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| FA5311BPS | 制造商:FUJI 制造商全称:Fuji Electric 功能描述:Bipolar IC For Switching Power Supply Control |
| FA5311BS | 制造商:未知厂家 制造商全称:未知厂家 功能描述:(374.50 k) |
| FA5311P | 制造商:Panasonic Industrial Company 功能描述:IC |
| FA5314 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:(374.50 k) |
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