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參數(shù)資料
| 型號： | T0P243G |
| 廠商： | Power Integrations, Inc. |
| 英文描述： | Family Extended Power, Design Flexible,Integrated Off-line Switcher |
| 中文描述： | 家庭擴展的電源，設計靈活，集成的離線切換 |
| 文件頁數(shù)： | 29/48頁 |
| 文件大?。?/td> | 771K |
| 代理商： | T0P243G |
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TOP242-249
29
August 8, 2000
E
7/01
Table 5 (cont). Comparison Between TOPSwitch-FX and TOPSwitch-GX.
*Not available
TOPSwitch-GX
Design Considerations
Power Table
Datasheet power table represents the maximum practical
continuous output power based on the following conditions:
TOP242 to TOP246: 12 V output, Schottky output diode,
150 V reflected voltage (VOR) and efficiency estimates from
curves contained in application note AN-29. TOP247 to TOP249:
Higher output voltages used with a maximum output current of
6 A.
For all devices a 100 VDC minimum for 85-265 VAC and 250
VDC minimum for 230 VDC are assumed and sufficient heat
sinking to keep device temperature
≤
100
°
C. Power levels
shown in the power table for the R package device assume
6.45 cm
2
of 610 g/m
2
copper heat sink area in an enclosed
adapter, or 19.4 cm
2
in an open frame.
TOPSwitch-GX
Selection
Selecting the optimum
TOPSwitch
-
GX
depends upon required
maximum output power, efficiency, heat sinking constraints
and cost goals. With the option to externally reduce current
limit, a larger
TOPSwitch
-
GX
may be used for lower power
Function
TOPSwitch-FX
TOPSwitch-GX
TOPSwitch-GX
Advantages
P/G Package Current
Limits
Identical to Y
packages
TOP243P or G and
TOP244P or G internal
current limits reduced
Matches device current limit to
package dissipation capability
Allows more continuous design to
lower device dissipation (lower RMS
currents)
Minimizes transformer core size
Optimizes efficiency for most
applications
Allows higher output powers in
high ambient temperature
applications
Reduces output line frequency
ripple at low line
D
reduction optimized for
forward design
Provides a well defined turn-off
threshold as the line voltage falls
Y/R Package Current
Limits
100%
(R package N/A*)
90% (for equivalent R
DS (ON)
)
Thermal Shutdown
125
°
C min.
70
°
C hysteresis
130
°
C min. 75
°
C
hysteresis
Maximum Duty Cycle
Reduction Threshold
90
μ
A
60
μ
A
Line Under-Voltage
Negative (turn-off)
Threshold
Soft-Start
N/A*
40% of positive (turn-on)
threshold
10 ms (duty cycle) 10 ms (duty cycle + current
limit)
Gradually increasing current limit
in addition to duty cycle during soft-
start further reduces peak current
and voltage
Further reduces component
stresses during start up
applications where higher efficiency is needed or minimal heat
sinking is available.
Input Capacitor
The input capacitor must be chosen to provide the minimum
DC voltage required for the
TOPSwitch
-
GX
converter to maintain
regulation at the lowest specified input voltage and maximum
output power. Since
TOPSwitch
-
GX
has a higher DC
than
TOPSwitch-II
, it is possible to use a smaller input capacitor.
For
TOPSwitch
-
GX,
a
capacitance of 2
μ
F per watt is possible
for universal input with an appropriately designed transformer.
Primary Clamp and Output Reflected Voltage V
A primary clamp is necessary to limit the peak
TOPSwitch
-
GX
drain to source voltage. A Zener clamp requires few parts and
takes up little board space. For good efficiency, the clamp
Zener should be selected to be at least 1.5 times the output
reflected voltage V
as this keeps the leakage spike conduction
time short. When using a Zener clamp in a universal input
application, a V
of less than 135 V is recommended to allow
for the absolute tolerances and temperature variations of the
Zener. This will ensure efficient operation of the clamp circuit
and will also keep the maximum drain voltage below the rated
breakdown voltage of the
TOPSwitch
-
GX
MOSFET.
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