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參數(shù)資料
| 型號： | TDA8380A |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Control circuit for switched mode power supplies |
| 中文描述： | SWITCHING CONTROLLER, PDIP16 |
| 封裝： | 0.300 INCH, PLASTIC, MO-001AE, SOT-38-1, DIP-16 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大小： | 158K |
| 代理商： | TDA8380A |
November 1993
7
Philips Semiconductors
Product specification
Control circuit for switched mode power supplies
TDA8380A
Synchronization
The synchronisation input (pin 11) can be driven by either an optocoupler or a loosely coupled pulse transformer.
Figure 5 illustrates synchronization using the 0.85 V threshold and a digital signal connected to the SYNC input (for
example, an optocoupler between pin 11 and V
CC
); the duty factor of the pulse is not very important. The oscillator starts
at the first negative going edge of the sync. signal after the low voltage level has been reached. The synchronization
frequency must be lower than the free running frequency. Synchronization must never affect the period time as this will
corrupt the setting of the maximum duty factor.
In Fig.6 the disabling threshold (5.6 V) is used for synchronization. In this case the oscillator starts at the positive going
edge of the sync. signal.
Fig.5 DC coupled synchronization using the 0.85 V level.
Fig.6 DC coupled synchronization using the 5.6 V level.
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