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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)： | 14/20頁 |
| 文件大?。?/td> | 319K |
| 代理商： | LM3101 |
Typical Applications
(Continued)
The duty cycle will reach the R
DL
limit for several cycles,
letting energy build up in the transformerDsee the drain cur-
rent waveform in Figure 9. When the residual energy builds
up enough, the duty cycle starts to decrease because it is
now determined by the CLIM circuit. A voltage of 0.38V or
greater at this pin will toggle a pulse-by-pulse comparator
on every cycle (see the LM3001 block diagram). In the ap-
plication circuit, a 0.167
X
resistor will generate the current
limit threshold voltage when a 2.28A (peak) current flows
through it. With the CLIM circuit in control of the duty cycle,
the duty cycle will decrease with each successive cycle.
The duty cycle will continue to shrink until the pulse feed-
back from the LM3101 takes control.
As the LM3001 switches the Power MOSFET on and off,
the Power Transformer starts delivering power to the sec-
ondary side of the circuit. This action will cause the supply
voltage of the LM3101 and the output voltage to gradually
rise. When the supply voltage reaches the Undervoltage
Lockout Threshold (of 3.9V), the LM3101 starts supplying a
pulse train to the differentiator circuit on pin 8. The resulting
PWM signals are fed back to the LM3001 via the pulse
transformer. The first pulse signal to the LM3001 will cause
it to disconnect its internal oscillator from its PWM and Out-
put Driver circuits and trigger the Output Driver from the
pulse feedback signals (of the LM3101). At this point, con-
trol of the frequency and the duty cycle changes from the
LM3001 to the LM3101.
The LM3101 also exercises Soft-Start capability (pin 3). An
RC network connected to this pin allows the LM3101 to
gradually increase the duty cycle to its nominal value (in the
example, the secondary Soft-Start time delay is 500
m
s ap-
proximately).
The method of Soft-Start used by the LM3101 ensures that
the error amplifier is in its linear region before the output
voltage reaches its nominal value, thus yielding a smooth
start-up of the output without any overshoot (seeFigure 10).
(Representative not to scale)
TL/H/11436–15
FIGURE 9. Start-Up Timing Sequence
14
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM3101M | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Secondary-Side PWM Controller |
| LM3101N | 制造商:Texas Instruments 功能描述: |
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