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FA5316PS Datasheet(PDF) 11 Page - Fuji Electric |
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FA5316PS Datasheet(HTML) 11 Page - Fuji Electric |
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11 / 17 page  11 FA531X series 2. Disabling overload shutdown function As shown in Figure 24, connect a 11k Ω 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 µA < Ics(sink) < 500µA 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 Ω) 467 ( µA) < 500 (µA) 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 Ω 18V Zener diode Under 500 µA |
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