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參數(shù)資料
| 型號： | FA5305APS |
| 廠商： | FUJI ELECTRIC HOLDINGS CO., LTD. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Bipolar IC For Switching Power Supply Control |
| 中文描述： | 雙極集成電路開關(guān)電源控制 |
| 文件頁數(shù)： | 9/17頁 |
| 文件大小： | 280K |
| 代理商： | FA5305APS |
9
FA5304AP(S)/FA5305AP(S)
The detection threshold is -0.17v for FA5305A with respect to
ground as shown in Figure 17.
The operation is similar to that of FA5304A except the
threshold is minus voltage compared to that which is plus
voltage for FA5304A.
Figure 18 is a timing chart which illustrates current limiting
operations.
6. Undervoltage lockout circuit
The IC incorporates a circuit which prevents the IC from
malfunctioning when the supply voltage drops. When the
supply voltage is raised from 0V, the IC starts operation with
V
CC
=16.0V.
If the supply voltage drops, the IC shuts its output down when
V
CC
=8.7V. When the undervoltage lockout circuit operates, the
CS pin goes low to reset the IC.
7. Output circuit
As shown in Figure 19, the IC’s totem-pole output can directly
drive the MOSFET. The OUT pin can source and sink currents
of up to 1.5A.
If IC operation stops when the undervoltage lockout circuit
operates, the gate voltage of the MOSFET goes low and the
MOSFET is shut down.
Fig. 17 Overcurrent limiting circuit for FA5305A
Fig. 18 Overcurrent timing chart for FA5305A
Fig. 19 Output circuit
CS pin voltage (3.6V)
DT voltage
FB pin voltage
Oscillator output
OUT pin outputH
L
IS ( – ) pin voltage
Comparator C4
Reference
voltage (– 0.17V)
Bias voltage
OFF
Overcurrent limiting
Minus
detection
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