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参数资料
| 型号： | FA5502P |
| 厂商： | FUJI ELECTRIC CO LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A POWER FACTOR CONTROLLER, 150 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封装： | DIP-16 |
| 文件页数： | 10/23页 |
| 文件大小： | 217K |
| 代理商： | FA5502P |
18
Quality is our message
FA5502P/M
9. Design advice
(1) Vcc circuit
Vcc voltage can be supplied from an auxiliary
winding of the inductor. An example circuit is shown in
Fig.15.
FA5502
10
7
GND
VCC
Rs
R8
L
(sub)
D3
Q1
D1
Co
C5
Vac
Fig.15 Vcc circuit (1)
In this circuit, R8 is a start up resistor. The start up
resistor R8 should be satisfied the following formula in
order to supply with at least 30A of IC start up
current.
6
10
30
5
.
17
(min)
Vac
2
8
R
×
×
<
(11)
Note that this formula is a minimum condition for
starting the IC. Practically, determine the value upon
taking into account the start up time required for
converter. The start up time must be determined upon
measurement at actual circuit operation.
In steady state, Vcc is supplied from the auxiliary
winding (sub) of inductor. When the IC is just starting
up, however, it takes time for the voltage from auxiliary
winding to rise enough. The value of capacitor C5
connected to Vcc pin should be determined to prevent
Vcc from falling below the OFF threshold voltage of
UVLO during this period. The capacity of C5 should be
determined by evaluation in the actual circuit because
the time lag is different in each circuit.
UVLO
ON
UVLO
OFF
Auxiliary winding voltage
Vcc
t
Vcc must not drop
below UVLO OFF.
Fig.16 Vcc voltage at start up
Even after PFC starts up, Vcc may fall due to step
changes of the load or inputs. To prevent the IC from
stopping in those cases, the circuit shown in Fig.17 is
effective to prolong the hold time of the Vcc voltage.
After the PFC converter starts up, Vcc is supplied
through C6. Therefore, you can prolong the hold time
of Vcc by using a large capacity for C6.
R8
D3
D4
C5
C6
sub
VCC
Fig.17 Vcc circuit (2)
In some case, the Vcc voltage cannot be supplied
enough in light load condition. In this case, the circuit
shown in Fig.18 may be effective to improve the Vcc.
The appropriate value of C7 and R9 should be
determined by evaluation in actual circuit because
they depend on each circuit.
R8
D3
D5
C5
C7
sub
VCC
R9
Fig.18 Vcc circuit (3)
(2) Supplying Vcc from external power supply
If Vcc is not supplied from the auxiliary winding of
inductor but from an external power supply, pay
attention to the followings.
In order to start up the IC, Vcc must be above the ON
threshold voltage VTHUON (17.5V (max.)) of
undervoltage lockout circuit (UVLO). When starting
up, apply at least this VTHUON. After starting up,
the operation is available within the recommended
range of 10 to 28V.
If a noise is applied to Vcc pin, it may cause
malfunction. To avoid a noise, connect a capacitor
near VCC pin even when Vcc is supplied from an
external power supply. To prevent a malfunction,
suppress the noise below about ±0.6V. And, make
sure there is no malfunction attributable to noise.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FA5502P/M | 制造商:未知厂家 制造商全称:未知厂家 功能描述:FA5502P/M is a control IC for a power factor correction system. |
| FA5502P-A2 | 制造商:Fuji Electric 功能描述: |
| FA5504P-D1 | 制造商:Fuji Electric 功能描述: |
| FA551 | 制造商:Black Box Corporation 功能描述:TRANSCEIVER CONNECTOR KITFEMAL |
| FA5510N | 制造商:未知厂家 制造商全称:未知厂家 功能描述:CMOS IC For Switching Power Supply Control |
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