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参数资料
| 型号： | FA3687V |
| 厂商： | FUJI ELECTRIC CO LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 0.4 A DUAL SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 1.10 MM HEIGHT, TSSOP-16 |
| 文件页数： | 7/18页 |
| 文件大小： | 378K |
| 代理商： | FA3687V |
FA3687V
15
s Design advice
1. Setting the oscillation frequency
As described in item 1 of “Description of each circuit,” a desired
oscillation frequency can be determined by the value of the
resistor connected to the RT pin. When designing an oscillation
frequency, you can set any frequency between 300kHz and
1.5MHz. You can obtain the oscillation frequency from the
characteristic curve “Oscillation frequency (fosc) vs. timing
resistor resistance (RT)” or the value can be approximately
calculated by the following expression.
This expression, however, can be used for rough calculation,
the obitained value is not guaranteed. The operation frequency
varies due to the conditions such as tolerance of the
characteristics of the ICs, influence of noises, or external
discrete components. When determining the values, examine
the effectiveness of the values in an actual circuit. The timing
resistor RT should be wired to the GND pin as shortly as
possible because the RT pin is a high impedance pin and is
easy affected by noises.
2. Operation near the maximum or the minimum output
duty cycle
As described in “Output duty cycle vs. voltage”, the output duty
cycle of this IC changes sharply near the minimum and the
maximum output duty cycle. Note that these phenomena are
conspicuous for high frequency operation (when the pulse width
is narrow).
3. Determining soft start period
The period from the start of charging the capacitor CCS to
widening n% of output duty cycle can be roughly calculated by
the following expression: (see Fig. 5 for symbols)
VCS1n and VCS2n are the voltage of the CS1 and CS2 pins in
n% of output duty cycle, and vary in accordance with operating
frequency. The value can be obtained from the characteristic
curve “Output duty cycle vs. CS voltage”
To reset the soft start function, the supply voltage VCC is
lowered below the UVLO voltage (2.1V typ.) and then the
internal switch discharges the CS capacitor. The characteristics
of the internal switch for discharge are shown in following the
characteristics curves of “Characteristics of CS1 internal
discharge switch current vs. voltage” and “Characteristics of
CS2 internal discharge switch current vs. voltage”. Therefore,
when determining the period of soft start at restarting the power
supply, consider the characteristics carefully.
CCS1, CCS2: Capacitance connected to CS1or CS2 pin [F]
R7, R9:
Resistance connected to CS1 or CS2 pin [k
]
fOSC = 4050
RT –0.86
fOSC: Oscillation frequency [kHz]
RT:
Timing resistor [k
]
(
)
RT =
4050
fOSC
1.16
For CS1 pin
()
t [ms] = R7
CCS1
1n 1 –
VCS1n
VREG
For CS2 pin
()
t [ms] = R9
CCS2
1n
VCS2n
VREG
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