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TOP242-249
TOPSwitch®-GX Family
Extended Power, Design Flexible,
EcoSmart®, Integrated Off-line Switcher
®
Product Highlights
Lower System Cost, High Design Flexibility
Extended power range to 250 W
Features eliminate or reduce cost of external components
Fully integrated soft-start for minimum stress/overshoot
Externally programmable accurate current limit
Wider duty cycle for more power, smaller input capacitor
Separate line sense and current limit pins on Y/R packages
Line under-voltage (UV) detection: no turn off glitches
Line overvoltage (OV) shutdown extends line surge limit
Line feed forward with maximum duty cycle (DCMAX)
reduction rejects line ripple and limits DC at high line
MAX
Frequency jittering reduces EMI and EMI filtering costs
Regulates to zero load without dummy loading
132 kHz frequency reduces transformer/power supply size
Half frequency option in Y/R packages for video applications
Hysteretic thermal shutdown for automatic fault recovery
Large thermal hysteresis prevents PC board overheating
EcoSmart - Energy Efficient
Extremely low consumption in remote off mode
(80 mW @ 110 VAC, 160 mW @ 230 VAC)
Frequency lowered with load for high standby efficiency
Allows shutdown/wake-up via LAN/input port
Description
TOPSwitch-GX uses the same proven topology as TOPSwitch,
cost effectively integrating the high voltage power MOSFET,
PWM control, fault protection and other control circuitry onto
a single CMOS chip. Many new functions are integrated to
reduce system cost and improve design flexibility, performance
and energy efficiency.
Depending on package type, the TOPSwitch-GX family has
either 1 or 3 additional pins over the standard DRAIN, SOURCE
and CONTROL terminals. allowing the following functions:
line sensing (OV/UV, line feedforward/DC max reduction),
accurate externally set current limit, remote on/off, and
synchronization to an external lower frequency and frequency
selection (132 kHz/66 kHz).
+
AC DC
IN OUT
-
DL
TOPSwitch-GX
CONTROL
C
S XF
Figure 1. Typical Flyback Application.
PI-2632-060200
OUTPUT POWER TABLE
PRODUCT3
230 VAC ±15%4
85-265 VAC
Adapter1
Open
Frame2
Adapter1
Open
Frame2
TOP242 P or G 9 W
TOP242 R 10 W
TOP242 Y 10 W
15 W
22 W
22 W
6.5 W
7W
7W
10 W
14 W
14 W
TOP243 P or G 13 W
TOP243 R 20 W
TOP243 Y 13 W
25 W
43 W
45 W
9W
15 W
15 W
15 W
23 W
30 W
TOP244 P or G 16 W
TOP244 R 28 W
TOP244 Y 30 W
30 W
52 W
65 W
11 W
18 W
20 W
20 W
28 W
45 W
TOP245 R
TOP245 Y
33 W 58 W 20 W 32 W
40 W 85 W 26 W 60 W
TOP246 R
TOP246 Y
37 W 65 W 24 W 36 W
60 W 125 W 40 W 90 W
TOP247 R
TOP247 Y
41 W 73 W 26 W 43 W
85 W 165 W 55 W 125 W
TOP248 R
TOP248 Y
43 W 78 W 28 W 48 W
105 W 205 W 70 W 155 W
TOP249 R
TOP249 Y
45 W 82 W 30 W 52 W
120 W 250 W 80 W 180 W
All package types provide the following transparent features:
Soft-start, 132 kHz switching frequency (automatically reduced
at light load), frequency jittering for lower EMI, wider DCMAX,
hywstewrewtic.DthearmtaaSl shhuetdeotw4nUa.ncdolamrger creepage packages. In
addition, all critical parameters (i.e. current limit, frequency,
PWM gain) have tighter temperature and absolute tolerance, to
simplify design and optimize system cost.
Table 1. Notes: 1. Typical continuous power in a non-ventilated
enclosed adapter measured at 50 °C ambient. Assumes 1 sq. in. of
2 oz. copper heat sink area for R package. 2. Maximum practical
continuous power in an open frame design at 50 °C ambient. See
Key Applications for detailed conditions. Assumes 3 sq. in. of 2 oz.
copper heat sink area for R package. 3. See Part Ordering Information.
4. 230 VAC or 100/115 VAC with doubler.
July 2001

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TOP242-249
Section List
Functional Block Diagram ......................................................................................................................................... 3
Pin Functional Description ........................................................................................................................................ 4
TOPSwitch-GX Family Functional Description ........................................................................................................ 5
CONTROL (C) Pin Operation ................................................................................................................................. 6
Oscillator and Switching Frequency ....................................................................................................................... 6
Pulse Width Modulator and Maximum Duty Cycle ................................................................................................. 7
Light Load Frequency Reduction ............................................................................................................................ 7
Error Amplifier ......................................................................................................................................................... 7
On-chip Current Limit with External Programmability ............................................................................................. 7
Line Under-Voltage Detection (UV) ........................................................................................................................ 8
Line Overvoltage Shutdown (OV) ........................................................................................................................... 8
Line Feed Forward with DC Reduction .............................................................................................................. 8
MAX
Remote ON/OFF and Synchronization ................................................................................................................... 9
Soft-Start ................................................................................................................................................................ 9
Shutdown/Auto-Restart .......................................................................................................................................... 9
Hysteretic Over-Temperature Protection ................................................................................................................ 9
Bandgap Reference ................................................................................................................................................ 9
High-Voltage Bias Current Source ........................................................................................................................ 10
Using Feature Pins .................................................................................................................................................... 11
FREQUENCY (F) Pin Operation........................................................................................................................... 11
LINE-SENSE (L) Pin Operation ............................................................................................................................ 11
EXTERNAL CURRENT LIMIT (X) Pin Operation ................................................................................................. 11
MULTI-FUNCTION (M) Pin Operation .................................................................................................................. 12
Typical Uses of FREQUENCY (F) Pin ...................................................................................................................... 15
Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins ....................................................... 16
Typical Uses of MULTI-FUNCTION (M) Pin ............................................................................................................. 19
Application Examples ............................................................................................................................................... 21
A High Efficiency, 30 W, Universal Input Power Supply ........................................................................................ 21
A High Efficiency, Enclosed, 70 W, Universal Adapter Supply.............................................................................. 22
A High Efficiency, 250 W, 250 - 380 VDC Input Power Supply ............................................................................. 23
Multiple Output, 60 W, 185 - 265 VAC Input Power Supply .................................................................................. 24
Processor Controlled Supply Turn On/Off ............................................................................................................ 25
Key Application Considerations .............................................................................................................................. 27
TOPSwitch-II vs. TOPSwitch-GX .......................................................................................................................... 27
TOPSwitch-FX vs. TOPSwitch-GX ....................................................................................................................... 28
TOPSwitch-GX Design Considerations ................................................................................................................ 29
TOPSwitch-GX Layout Considerations................................................................................................................. 31
Quick Design Checklist ......................................................................................................................................... 31
Design Tools ......................................................................................................................................................... 33
Product Specifications and Test Conditions .......................................................................................................... 34
Typical Performance Characteristics ...................................................................................................................... 41
Part Ordering Information ........................................................................................................................................ 45
Package Outlines ...................................................................................................................................................... 45
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CONTROL (C)
EXTERNAL
CURRENT LIMIT (X)
LINE-SENSE (L)
FREQUENCY (F)
VC
ZC
SHUNT REGULATOR/
ERROR AMPLIFIER
-
+ 5.8 V
IFB
VI (LIMIT)
CURRENT
LIMIT
SOFT
ADJUST START
ON/OFF
VBG + VT
5.8 V
4.8 V
+
-
INTERNAL UV
COMPARATOR
SOFT START
0
INTERNAL
1 SUPPLY
÷8
SHUTDOWN/
AUTO-RESTART
1V
VBG
OV/UV
LINE
SENSE DCMAX
STOP LOGIC
STOP SOFT-
START
DCMAX
DMAX
CLOCK
HYSTERETIC
THERMAL
SHUTDOWN
HALF
FREQ.
SAW
OSCILLATOR WITH JITTER
-
+
PWM
COMPARATOR
LIGHT LOAD
RE
FREQUENCY
REDUCTION
SQ
R
Figure 2a. Functional Block Diagram (Y or R Package).
TOP242-249
DRAIN (D)
-
+
CURRENT LIMIT
COMPARATOR
CONTROLLED
TURN-ON
GATE DRIVER
LEADING
EDGE
BLANKING
SOURCE (S)
PI-2639-060600
PI-2639-060600
CONTROL (C)
MULTI-
FUNCTION (M)
VC
ZC
SHUNT REGULATOR/
ERROR AMPLIFIER
-
+ 5.8 V
IFB
VI (LIMIT)
CURRENT
LIMIT
ADJUST
SOFT
START
ON/OFF
5.8 V
4.8 V
+
-
INTERNAL UV
COMPARATOR
VBG + VT
STOP LOGIC
VBG
OV/UV
LINE
SENSE DCMAX
STOP SOFT-
START
DCMAX
DMAX
CLOCK
SOFT START
0
1
÷8
SHUTDOWN/
AUTO-RESTART
HYSTERETIC
THERMAL
SHUTDOWN
SAW
-
OSCILLATOR WITH JITTER
+
PWM
COMPARATOR
LIGHT LOAD
RE
FREQUENCY
REDUCTION
INTERNAL
SUPPLY
S
R
Q
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Figure 2b. Functional Block Diagram (P or G Package).
DRAIN (D)
-
+
CURRENT LIMIT
COMPARATOR
CONTROLLED
TURN-ON
GATE DRIVER
LEADING
EDGE
BLANKING
SOURCE (S)
PI-2631-061200
PI-2641-061200
August 8, 2000
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