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PDF ( 数据手册 , 数据表 ) T0P246

零件编号 T0P246
描述 (T0P242 - T0P2439) Family Extended Power
制造商 Power Integrations
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T0P246 数据手册, 描述, 功能
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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







T0P246 pdf, 数据表
www.DataSheet4U.com
TOP242-249
second resistor connected between the EXTERNAL CURRENT
LIMIT (X) pin (Y or R package) or MULTI-FUNCTION (M)
pin (P or G package) and the rectified DC high voltage bus, the
current limit is reduced with increasing line voltage, allowing
a true power limiting operation against line variation to be
implemented. When using an RCD clamp, this power limiting
technique reduces maximum clamp voltage at high line. This
allows for higher reflected voltage designs as well as reducing
clamp dissipation.
The leading edge blanking circuit inhibits the current limit
comparator for a short time after the output MOSFET is turned
on. The leading edge blanking time has been set so that, if a
power supply is designed properly, current spikes caused by
primary-side capacitances and secondary-side rectifier reverse
recovery time should not cause premature termination of the
switching pulse.
The current limit is lower for a short period after the leading
edge blanking time as shown in Figure 52. This is due to
dynamic characteristics of the MOSFET. To avoid triggering
the current limit in normal operation, the drain current waveform
should stay within the envelope shown.
Line Under-Voltage Detection (UV)
At power up, UV keeps TOPSwitch-GX off until the input line
voltage reaches the under voltage threshold. At power down,
UV prevents auto-restart attempts after the output goes out of
regulation. This eliminates power down glitches caused by the
slow discharge of large input storage capacitor present in
applications such as standby supplies. A single resistor connected
from the LINE-SENSE pin (Y or R package) or MULTI-
FUNCTION pin (P or G package) to the rectified DC high
voltage bus sets UV threshold during power up. Once the power
supply is successfully turned on, the UV threshold is lowered to
40% of the initial UV threshold to allow extended input voltage
operating range (UV low threshold). If the UV low threshold
is reached during operation without the power supply losing
regulation the device will turn off and stay off until UV (high
threshold) has been reached again. If the power supply loses
regulation before reaching the UV low threshold, the device
will enter auto-restart. At the end of each auto-restart cycle (S7),
the UV comparator is enabled. If the UV high threshold is not
exceeded the MOSFET will be disabled during the next cycle (see
figure 8). The UV feature can be disabled independent of OV
feature as shown in Figure 19 and 23.
Line Overvoltage Shutdown (OV)
The same resistor used for UV also sets an overvoltage threshold
which, once exceeded, will force TOPSwitch-GX output into
off-state. The ratio of OV and UV thresholds is preset at 4.5 as
can be seen in Figure 11. When the MOSFET is off, the rectified
DC high voltage surge capability is increased to the voltage
rating of the MOSFET (700 V), due to the absence of the
reflected voltage and leakage spikes on the drain. A small
amount of hysteresis is provided on the OV threshold to prevent
noise triggering. The OV feature can be disabled independent
of the UV feature as shown in Figure 18 and 32.
Line Feed Forward with DCMAX Reduction
The same resistor used for UV and OV also implements line
voltage feed forward which minimizes output line ripple and
reduces power supply output sensitivity to line transients. This
feed forward operation is illustrated in Figure 7 by the different
values of IL (Y or R package) or IM (P or G Package). Note that
for the same CONTROL pin current, higher line voltage results
in smaller operating duty cycle. As an added feature, the
maximum duty cycle DCMAX is also reduced from 78% (typical)
at a voltage slightly higher than the UV threshold to 38%
(typical) at the OV threshold (see Figures 7, 11). Limiting
Oscillator
(SAW)
DMAX
Enable from
X, L or M Pin (STOP)
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Figure 10. Synchronization Timing Diagram.
8E
7/01
August 8, 2000
Time
PI-2637-060600







T0P246 equivalent, schematic
www.DataSheet4U.com
TOP242-249
Typical Uses of LINE-SENSE (L) and EXTERNAL CURRENT LIMIT (X) Pins
+
DC
Input
Voltage
DL
CONTROL
C
CLXS F D
CS D
- S XF
PI-2617-050100
Figure 16. Three Terminal Operation (LINE-SENSE and
EXTERNAL CURRENT LIMIT Features Disabled.
FREQUENCY Pin can be tied to SOURCE or
CONTROL Pin).
+
DC
Input
Voltage
VUV = IUV x RLS
VOV = IOV x RLS
For RLS = 2 M
RLS 2MVUV = 100 VDC
VOV = 450 VDC
DCMAX@100 VDC = 78%
DCMAX@375 VDC = 38%
DL
CONTROL
C
-S
PI-2618-040501
Figure 17. Line-Sensing for Under-Voltage, Overvoltage and
Line Feed Forward.
+
DC
Input
Voltage
6.2 V
2 M
VUV = RLS x IUV
For Value Shown
RLS VUV = 100 VDC
22 k
DM
CONTROL
C
-S
PI-2510-040501
Figure 18. Line-Sensing for Under-Voltage Only (Overvoltage
Disabled).
+
DC
Input
Voltage
2 M
VOV = IOV x RLS
For Values Shown
RLS VOV = 450 VDC
30 k
DL
CONTROL
C
1N4148
-S
PI-2620-040501
Figure 19. Line-Sensing for Overvoltage Only (Under-Voltage
Disabled). Maximum Duty Cycle will be reduced at
Low Line.
+
DC
Input
Voltage
For RIL = 12 k
ILIMIT = 69%
For RIL = 25 k
ILIMIT = 43%
See fig. 55 for other
D resistor values (RIL)
CONTROL
C
SX
RIL
-
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Figure 20. Externally Set Current Limit.
PI-2623-040501
16 E
7/01
August 8, 2000
+
RLS 2.5 M
ILIMIT = 100% @ 100 VDC
ILIMIT = 63% @ 300 VDC
DC
Input
Voltage
D
CONTROL
C
SX
RIL
- 6 k
PI-2624-040501
Figure 21. Current Limit Reduction with Line Voltage.










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