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参数资料
| 型号： | FA5310BS |
| 厂商： | FUJI ELECTRIC CO LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 3/19页 |
| 文件大小： | 2198K |
| 代理商： | FA5310BS |
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CO
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2
35
FA531X series
2. Disabling overload shutdown function
As shown in Figure 24, connect a 11k
resistor between the
FB pin and ground. Then, the CS pin voltage does not rise
high enough to reach the reference voltage (7.0V) of the latch
comparator, and the IC does not enter the OFF latch mode.
With this connection, the overvoltage shutdown function is
available.
3. Setting soft start period and OFF latch delay
independently
Figure 25 shows a circuit for setting the soft start period and
OFF latch delay independently. In this circuit, capacitance CS
determines the soft start period, and capacitance CL
determines the OFF latch delay. If the overload shutdown and
overvoltage shutdown functions raise the CS pin voltage to
around 5V, zener diode Zn becomes conductive to charge CL.
The OFF latch delay can be thus prolonged by CL.
4. Laying out VCC and ground lines
Figure 26 and 27 show the recommended layouts of VCC and
ground lines. The bold lines represent paths carrying large
currents. The lines must have an adequate thickness.
5.Sink current setting for CS terminal
A sink current to CS terminal must be satisfied the following
condition to prevent from the malfunction which uncontrolled
pulse output generates at OUT terminal when latch-mode
protection should be operated for overvoltage.
65
A < Ics(sink) < 500A at Vcs= 6.5(V)
Ics(sink) : Sink current to CS terminal
Example (for the circuit shown in Fig. 28 )
Ics(sink) = (28(V)–18(V)– 6.5(V) )/7.5(k
)
467 (
A) < 500 (A)
Fig. 24 Disabling overload shutdown function
Fig. 25 Independent setting of soft-start period
and OFF latch delay
Fig. 27 Vcc line and ground line (2) for FA5314/15
Fig. 26 Vcc line and ground line (1) for FA5310B/11B/16/17
Fig. 28 Setting sink current for CS terminal
CS
VCC
7.5k
18V Zener diode
Under 500
A
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