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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
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TOP242-249
Pin Functional Description
DRAIN (D) Pin:
High voltage power MOSFET drain output. The internal start-
up bias current is drawn from this pin through a switched high-
voltage current source. Internal current limit sense point for
drain current.
CONTROL (C) Pin:
Error amplifier and feedback current input pin for duty cycle
control. Internal shunt regulator connection to provide internal
bias current during normal operation. It is also used as the
connection point for the supply bypass and auto-restart/
compensation capacitor.
LINE-SENSE (L) Pin: (Y or R package only)
Input pin for OV, UV, line feed forward with DCMAX reduction,
remote ON/OFF and synchronization. A connection to SOURCE
pin disables all functions on this pin.
EXTERNAL CURRENT LIMIT (X) Pin: (Y or R package only)
Input pin for external current limit adjustment, remote
ON/OFF, and synchronization. A connection to SOURCE pin
disables all functions on this pin.
MULTI-FUNCTION (M) Pin: (P or G package only)
This pin combines the functions of the LINE-SENSE (L) and
EXTERNAL CURRENT LIMIT (X) pins of the Y package into
one pin. Input pin for OV, UV, line feed forward with DC
MAX
reduction, external current limit adjustment, remote ON/OFF
and synchronization. A connection to SOURCE pin disables all
functions on this pin and makes TOPSwitch-GX operate in
simple three terminal mode (like TOPSwitch-II).
FREQUENCY (F) Pin: (Y or R package only)
Input pin for selecting switching frequency: 132 kHz if
Y Package (TO-220-7C)
Tab Internally
Connected to
SOURCE Pin
P Package (DIP-8B)
G Package (SMD-8B)
R Package
(TO-263-7C)
7D
5F
4S
3X
2L
1C
M1
8S
S2
7S
S3
wCww4.DataShe5et4UD .com 1 2 3 4 5 7
C L X S F D PI-2724-033001
Figure 3. Pin Configuration (top view).
4E
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August 8, 2000
connected to SOURCE pin and 66 kHz if connected to
CONTROL pin. The switching frequency is internally set for
fixed 132 kHz operation in P and G packages.
SOURCE (S) Pin:
Output MOSFET source connection for high voltage power
return. Primary side control circuit common and reference point.
+
DC
Input
Voltage
-
VUV = IUV x RLS
VOV = IOV x RLS
RLS 2 MFor RLS = 2 M
VUV = 100 VDC
VOV = 450 VDC
D L DCMAX@100 VDC = 78%
CONTROL DCMAX@375 VDC = 38%
C
SX
For RIL = 12 k
ILIMIT = 69%
RIL
12 k
See fig. 55 for other
resistor values (RIL)
to select different ILIMIT
values PI-2629-040501
Figure 4. Y/R Package Line Sense and Externally Set Current
Limit.
+
DC
Input
Voltage
VUV = IUV x RLS
VOV = IOV x RLS
RLS
2 M
For RLS = 2 M
VUV = 100 VDC
VOV = 450 VDC
DCMAX@100 VDC = 78%
D M DCMAX@375 VDC = 38%
CONTROL
C
-S
Figure 5. P/G Package Line Sense.
PI-2509-040501
+
DC
Input
Voltage
RIL
For RIL = 12 k
ILIMIT = 69%
For RIL = 25 k
ILIMIT = 43%
See fig. 55 for other
resistor values (RIL)
DM
to select different
ILIMIT values
CONTROL
C
-S
PI-2517-040501
Figure 6. P/G Package Externally Set Current Limit.

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TOP242-249
TOPSwitch-GX Family Functional Description
Like TOPSwitch, TOPSwitch-GX is an integrated switched
mode power supply chip that converts a current at the control
input to a duty cycle at the open drain output of a high voltage
power MOSFET. During normal operation the duty cycle of the
power MOSFET decreases linearly with increasing CONTROL
pin current as shown in Figure 7.
In addition to the three terminal TOPSwitch features, such as the
high voltage start-up, the cycle-by-cycle current limiting, loop
compensation circuitry, auto-restart, thermal shutdown, the
TOPSwitch-GX incorporates many additional functions that
reduce system cost, increase power supply performance and
design flexibility. A patented high voltage CMOS technology
allows both the high voltage power MOSFET and all the low
voltage control circuitry to be cost effectively integrated onto a
single monolithic chip.
Three terminals, FREQUENCY, LINE-SENSE, and
EXTERNAL CURRENT LIMIT (available in Y or R package)
or one terminal MULTI-FUNCTION (available in P or G
Package) have been added to implement some of the new
functions. These terminals can be connected to the SOURCE
pin to operate the TOPSwitch-GX in a TOPSwitch-like three
terminal mode. However, even in this three terminal mode, the
TOPSwitch-GX offers many new transparent features that do
not require any external components:
1. A fully integrated 10 ms soft-start limits peak currents and
voltages during start-up and dramatically reduces or
eliminates output overshoot in most applications.
2. DCMAX of 78% allows smaller input storage capacitor, lower
input voltage requirement and/or higher power capability.
3. Frequency reduction at light loads lowers the switching
losses and maintains good cross regulation in multiple
output supplies.
4. Higher switching frequency of 132 kHz reduces the
transformer size with no noticeable impact on EMI.
5. Frequency jittering reduces EMI.
6. Hysteretic over-temperature shutdown ensures automatic
recovery from thermal fault. Large hysteresis prevents circuit
board overheating.
7. Packages with omitted pins and lead forming provide large
drain creepage distance.
8. Tighter absolute tolerances and smaller temperature vari-
ations on switching frequency, current limit and PWM gain.
The LINE-SENSE (L) pin is usually used for line sensing by
connecting a resistor from this pin to the rectified DC high
voltage bus to implement line overvoltage (OV), under-voltage
(UV) and line feed forward with DCMAX reduction. In this
mowdew, twhe.vDalauetaofSthheereesist4toUr d.ecteormmines the OV/UV thresholds
and the DCMAX is reduced linearly starting from a line voltage
above the under-voltage threshold. See Table 2 and Figure 11.
Auto-restart
ICD1
132
IB
IL = 190 µA
IL = 125 µA
IL < IL(DC)
30
Auto-restart
ICD1
78
IC (mA)
IB
Slope = PWM Gain
38 IL = 125 µA
10 IL = 190 µA
IL < IL(DC)
TOP242/5 1.6 2.0
5.2 6.0
TOP246/9 2.2 2.6
5.8 6.6
IC (mA)
Note: For P and G packages IL is replaced with IM.
PI-2633-060500
Figure 7. Relationship of Duty Cycle and Frequency to CONTROL
Pin Current.
The pin can also be used as a remote ON/OFF and a
synchronization input.
The EXTERNAL CURRENT LIMIT (X) pin is usually used to
reduce the current limit externally to a value close to the operating
peak current, by connecting the pin to SOURCE through a
resistor. This pin can also be used as a remote ON/OFF and a
synchronization input in both modes. See Table 2 and Figure 11.
For the P or G packages the LINE-SENSE and EXTERNAL
CURRENT LIMIT pin functions are combined on one MULTI-
FUNCTION (M) pin. However, some of the functions become
mutually exclusive as shown in Table 3.
The FREQUENCY (F) pin in the Y or R package sets the
switching frequency to the default value of 132 kHz when
connected to SOURCE pin. A half frequency option of 66 kHz
can be chosen by connecting this pin to CONTROL pin instead.
Leaving this pin open is not recommended.
August 8, 2000
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