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參數(shù)資料
| 型號： | LM3101 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Secondary-Side PWM Controller |
| 中文描述： | 二次側(cè)PWM控制器 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 319K |
| 代理商： | LM3101 |
Application Hints
Pulse Feedback Section
During steady-state operation, the LM3101 delivers pulse-
width modulated signals to the feedback circuit. The feed-
back circuit will convert that signal into a series of AC-cou-
pled pulse signals and apply them to the LM3001 via the
pulse transformer (the first positive-edged pulse from the
LM3101 will cause the LM3001 to disconnect its internal
oscillator from its PWM and Output Driver circuits). The
feedback pulses will trigger the LM3001 Output Driver to
apply PWM drive signals to the Power MOSFET gate. The
timing diagram in Figure 12 demonstrates the feedback
communication.
Pulse Interface Circuit
The pulse interface circuit provides isolation for the feed-
back circuit of the Offline Flyback Regulator. The differentia-
tor circuit converts the PWM waveform into a pulse train.
The differentiator delivers a train of 1V
PK
, 15 ns wide pulses
to the pulse transformer. The core should have high perme-
ability (typically 10,000) at the switching frequency to allow
the transfer of energy with a very small transformer (size).
This one-to-one transformer transfers the pulse train to the
LM3001 via a 200
X
resistor, which is used mainly to filter
noise from the system.
TL/H/11436–18
FIGURE 12. Pulse Feedback Timing Diagram
TL/H/11436–19
FIGURE 13. Pulse Interface Circuit
17
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