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What is FA5310BPS?

This electronic component, produced by the manufacturer "Fuji Electric", performs the same function as "Bipolar IC For Switching Power Supply Control".


FA5310BPS Datasheet PDF - Fuji Electric

Part Number FA5310BPS
Description Bipolar IC For Switching Power Supply Control
Manufacturers Fuji Electric 
Logo Fuji Electric Logo 


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FA531XFA531X series series
FA5310BP(S), FA5314P(S), FA5316P(S)
FA5311BP(S), FA5315P(S), FA5317P(S)
s Description
The FA531X series are bipolar ICs for switching power supply
control that can drive a power MOSFET.
These ICs contain many functions in a small 8-pin package.
With these ICs, a high-performance and compact power
supply can be created because not many external discrete
components are needed.
s Features
• Drive circuit for connecting a power MOSFET
• Wide operating frequency range (5 to 600kHz)
• Pulse-by-pulse overcurrent limiting function
• Overload cutoff function (Latch or non-protection mode
selectable)
• Output ON/OFF control function by external signal
• Overvoltage cutoff function in latch mode
• Undervoltage malfunction prevention function
• Low standby current (90µA typical)
• Exclusive choices by circuits (See selection guide on page 25)
• 8-pin package (DIP/SOP)
s Applications
• Switching power supply for general equipment
Bipolar IC
For Switching Power Supply Control
s Dimensions, mm
SOP-8
8
5
14
6.05
0.4±0.1 1.27±0.2
DIP-8
8
5
0.6
1 9.3 4
1.5
s Block diagram
FA5310BP(S)/FA5311BP(S)/FA5316P(S)/FA5317P(S)
2.54±0.25 0.5±0.1
0~15˚
7.6
0.3 +–00.1.05
0~15˚
Pin Pin
No. symbol
1 RT
2 FB
3 IS (+)
4 GND
5 OUT
6 VCC
7 CT
8 CS
Description
Oscillator timing resistor
Feedback
Overcurrent (+) detection
Ground
Output
Power supply
Oscillator timing capacitor
Soft-start and ON/OFF control
FA5314P(S)/FA5315P(S)
Pin Pin
No. symbol
1 RT
2 FB
3 IS (–)
4 GND
5 OUT
6 VCC
7 CT
8 CS
Description
Oscillator timing resistor
Feedback
Overcurrent (–) detection
Ground
Output
Power supply
Oscillator timing capacitor
Soft-start and ON/OFF control
1

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FA5310BPS equivalent
FA531X series
4. CS pin circuit
As shown in Figure 5 capacitor CS is connected to the CS pin.
When power is turned on, the constant current source (10µA)
begins to charge capacitor CS. Accordingly, the CS pin
voltage rises as shown in Figure 6. The CS pin is connected to
an input of the PWM comparator. The device is in soft-start
mode while the CS pin voltage is between 0.9V and 1.9V
(FA5310/14/16) and between 0.9V and 2.3V(FA5311/15/17).
During normal operation, the CS pin is clamped at 3.6V by
internal zener diode Zn. If the output voltage drops due to an
overload, etc., the clamp voltage shifts from 3.6V to 8.0V. As a
result, the CS pin voltage rises to 8.0V. The CS pin is also
connected to latch comparator C2. If the pin voltage rises
above 7.0V, the output of comparator C2 goes high to turn off
the bias circuit, thereby shutting the output down. Comparator
C2 can be used not only for shutdown in response to an
overload, but also for shutdown in response to an overvoltage.
Comparator C1 is also connected to the CS pin, and the bias
circuit is turned off and the output is shut down if the CS pin
voltage drops below 0.42V. In this way, comparator C1 can
also be used for output on/off control.
As explained above, the CS pin can be used for soft-start
operation, overload and overvoltage output shutdown and
output on/off control.
Further details on the four functions of the CS pin are given
below.
4.1 Soft start function
Figure 7 shows the soft start circuit. Figure 8 is the soft-start
operation timing chart. The CS pin is connected to capacitor
CS. When power is turned on, a 10µA constant-current source
begins to charge the capacitor. As shown in the timing chart,
the CS pin voltage rises slowly in response to the charging
current. The CS pin is connected internally to the PWM
comparator. The comparator output pulse slowly widens as
shown in the timing chart.
The soft start period can be approximately evaluated by the
period ts from the time the IC is activated to the time the output
pulse width widens to 30%. Period ts is given by the following
equation:
tS(mS)=160CS(µF)...................................(2)
Fig. 5 CS pin circuit
Fig. 6 CS pin waveform
Fig. 7 Soft-start circuit
Fig. 8 Soft-start timing chart
5


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On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for FA5310BPS electronic component.


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