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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)： | 16/20頁 |
| 文件大小： | 319K |
| 代理商： | LM3101 |
Typical Applications
(Continued)
The maximum average current through the secondary and
the diode, when the switch is off, is the maximum load cur-
rent divided by the inverse of the duty cycle:
I
SEC(OFF)
e
I
LOAD
/(1–D
(MAX)
)
e
10A/0.72
e
13.90A
&
15A.
The maximum average secondary current for the entire peri-
od is the maximum load current (10A).
The maximum reverse-bias voltage on the output rectifier is:
V
RV
e
V
IN(MAX)
#
(N
S
/N
P
)
a
V
O
a
V
F
e
(185V) (1/8.5)
a
5.7V
e
27.47V
&
30V.
A suitable diode for this circuit is the SR1606, which has a
reverse voltage rating of 60V and an average current rating
of 16A.
Telecom Converter
The schematic of a flyback regulator, used in Telecom appli-
cations, is shown in Figure 11. The circuit has many of the
component values that are in the offline converter. Notable
exceptions are the power transformer, in which the turns
ratio and primary inductance has changed (due to the
change in the input voltage range), and the Power MOS-
FET, which has a lower on-resistance and a lower break-
down voltage rating.
The most significant difference in the circuit design is the
change in the mode of operationDfrom voltage mode to
current mode. For current mode operation, the LM3101
Mode Control pin (MC–pin 2) is connected to ground by a
6 k
X
resistor, and the Control Mode pin (CMI– pin 6) is
connected to the current sense transformer through a half-
wave rectifier circuit and a low-pass filter. The filter is need-
ed to remove the leading edge spike on the current wave-
form, caused by the rectifier recovery and interwinding ca-
pacitance of the power transformer.
Smaller component differences include reducing the current
sensing resistor in the primary side ground path (to allow for
the larger primary current), and removing a primary side
snubber circuit (due to smaller peak voltages at the drain).
Also, the output rectifier and Power MOSFET snubbers are
modified.
TL/H/11436–17
FIGURE 11. Telecom Current Mode Flyback Regulator
16
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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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