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PDF FA5311BP Data sheet ( Hoja de datos )

Número de pieza FA5311BP
Descripción Bipolar IC For Switching Power Supply Control
Fabricantes Fuji Electric 
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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
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FA5311BP pdf
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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FA5311BP arduino
FA531X series
2. Disabling overload shutdown function
As shown in Figure 24, connect a 11kresistor 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.
65µA < 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)
Լ 467 (µA) < 500 (µA)
Fig. 25 Independent setting of soft-start period
and OFF latch delay
Fig. 26 Vcc line and ground line (1) for FA5310B/11B/16/17
Fig. 24 Disabling overload shutdown function
11
Fig. 27 Vcc line and ground line (2) for FA5314/15
CS
VCC
7.5k18V Zener diode
Under 500µA
Fig. 28 Setting sink current for CS terminal

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