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| 型號： | AN-32 |
| 英文描述： | TOPSwitch-GX Flyback Design Methodology |
| 中文描述： | 的TOPSwitch - GX系列反激式設(shè)計方法 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 134K |
| 代理商： | AN-32 |
December 2002
Designing an off-line power supply involves many aspects of
electrical engineering: analog and digital circuits, bipolar and
MOS power device characteristics, magnetics, thermal
considerations, safety requirements, control loop stability, etc.
This represents an enormous challenge involving complex
trade-offs with a large number of design variables. As a result,
new off-line power supply development has always been tedious
and time consuming even for the experts in the field. This
application note introduces a simple, yet highly efficient
methodology for the design of
TOPSwitch-GX
family based
off-line power supplies. For
TOPSwitch-GX
Flyback designs,
Power Integrations recommends the use of
PI Expert
which
implements this design methodology and also includes a
knowledge base and optimization feature for making key design
choices, further reducing design time.
Introduction
The design of a switching power supply, by nature, is an
iterative process with many variables requiring adjustment to
optimize the design. The design method described in this
document consists of two major sections: A design flow chart
and a step-by-step design procedure. The flow chart shows the
design sequence at a conceptual level for
TOPSwitch-GX
flyback power supply design. The step-by-step procedure gives
details within each step of the design flow chart, including
empirical design guidelines and look-up tables. All key equations
and guidelines are provided wherever possible to assist the
readers in better understanding and/or further optimization.
Basic Circuit Configuration
Because of the high level integration of
TOPSwitch-GX
, many
power supply design issues are resolved in the chip. Far fewer
issues are left to be addressed externally, resulting in one
common circuit configuration for all applications. Different
output power levels may require different values for some
circuit components, but the circuit configuration stays
unchanged.
TOPSwitch-GX
is a feature-rich product family.
Advanced features like under-voltage, overvoltage, external
I
, line feed forward, and remote ON/OFF are easily
implemented with a minimal number of external components,
but do involve additional design considerations. Please refer to
the
TOPSwitch-GX
data sheet for details. Other application
Figure 1. Typical TOPSwitch-GX Flyback Power Supply.
D
S
C
CONTROL
L
F
X
+VD-
VAC
+VDB-
Clamp Zener
PI-3038-091102
VO
-
CIN
VB
-
+
Output Capacitor
Output Post Filter L, C
Bias Capacitor
Blocking Diode
CONTROL Pin Capacitor
and Series Resistor
External I
Resistor
(optional)
Line Sense
Resistor
f
S
= 132 kHz if connected as shown.
For f
= 66 kHz, connect "F" Pin to "C" Pin
(f
S
option not available with P or G package)
Feedback Circuit
TOPSwitch-GX
+
+
TOPSwitch-GX
Flyback
Design Methodology
Application Note AN-32
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