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參數(shù)資料
| 型號： | AN-37 |
| 英文描述： | LinkSwitch-TN Design Guide |
| 中文描述： | 的LinkSwitch - TN設(shè)計(jì)指南 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 155K |
| 代理商： | AN-37 |
LinkSwitch-TN
Design Guide
Application Note AN-37
January 2004
Figure 1 (a). Basic Configuration using LinkSwitch-TN in a Buck Converter. Figure 1 (b) Basic Configuration using LinkSwitch-TN in a
Buck-Boost Converter.
Introduction
LinkSwitch-TN
combines a high voltage power MOSFET switch
with an ON/OFF controller in one device. It is completely self-
powered from the DRAIN pin, has a jittered switching frequency
for low EMI and is fully fault protected. Auto-restart limits
device and circuit dissipation during overload and output short
circuit while over temperature protection disables the internal
MOSFET during thermal faults. The high thermal shutdown
threshold is ideal for applications where the ambient temperature
is high while the large hysteresis protects the PCB and
surrounding components from high average temperatures.
LinkSwitch-TN
is designed for any application where a non-
isolated supply is required such as appliances (coffee machines,
rice cookers, dishwashers, microwave ovens etc.), nightlights,
emergency exit signs and LED drivers.
LinkSwitch-TN
can be
configured in all common topologies to give a line or neutral
referenced output and an inverted or non-inverted output voltage
- ideal for applications using triacs for AC load control. Using
a switching power supply rather than a passive dropper
(capacitive or resistive) gives a number of advantages, some of
which are listed below.
Universal input – the same power supply/product can be
used worldwide
High power density – smaller size, no
μ
F’s of X class
capacitance needed
High efficiency – Full load efficiencies >75% typical for
12 V output
Excellent line and load regulation
High efficiency at light load – ON/OFF control maintains
high efficiency even at light load
Extremely energy efficient – input power <100 mW at no
load
Entirely manufacturable in SMD
More robust to drop test mechanical shock
Fully fault protected (overload, short circuit and thermal
faults)
Scalable –
LinkSwitch-TN
family allows the same basic
design to be used from <50 mA to 360 mA
Scope
This application note is for engineers designing a non-isolated
power supply using the
LinkSwitch-TN
family of devices. This
1 (a)
1 (b)
V
O
R
F
D
IN2
L
IN
D
IN2
C
IN1
C
IN2
R
FB
D
FB
R
BIAS
C
FB
C
BP
D
FW
C
O
R
PL
AC
Input
PI-3764-121003
+
FB
BP
S
D
LinkSwitch-TN
L
V
O
+
AC
Input
PI-3765-121003
FB
BP
S
D
LinkSwitch-TN
C
IN2
R
F
D
IN1
L
IN
C
BP
R
BIAS
C
FB
R
FB
L
D
FW
C
O
R
PL
D
FB
D
IN2
C
IN1
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