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TOP266KG 데이터시트 PDF




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부품번호 TOP266KG 기능
기능 Integrated Off-Line Switcher with EcoSmart Technology
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TOP266KG 데이터시트, 핀배열, 회로
TOP264-271
TOPSwitch-JX Family
Integrated Off-Line Switcher with EcoSmartTechnology
for Highly Efficient Power Supplies
Product Highlights
EcoSmart – Energy Efficient
Ideal for applications from 10 W to 245 W
Energy efficient over entire load range
No-load consumption below 100 mW at 265 VAC
Up to 750 mW standby output power for 1 W input at 230 VAC
High Design Flexibility for Low System Cost
Multi-mode PWM control maximizes efficiency at all loads
132 kHz operation reduces transformer and power supply size
66 kHz option for highest efficiency requirements
Accurate programmable current limit
Optimized line feed-forward for line ripple rejection
Frequency jittering reduces EMI filter cost
Fully integrated soft-start for minimum start-up stress
725 V rated MOSFET
Simplifies meeting design derating requirements
AC
IN
DV
TOPSwitch-JX
CONTROL
C
S XF
Figure 1. Typical Flyback Application.
+
DC
OU-T
PI-5578-090309
Extensive Protection Features
Auto-restart limits power delivery to <3% during overload faults
Output short-circuit protection (SCP)
Output over-current protection (OCP)
Output overload protection (OPP)
Output overvoltage protection (OVP)
User programmable for hysteretic/latching shutdown
Simple fast AC reset
Primary or secondary sensed
Line undervoltage (UV) detection prevents turn-off glitches
Line overvoltage (OV) shutdown extends line surge withstand
Accurate thermal shutdown with large hysteresis (OTP)
Advanced Package Options
eDIP-12 package:
43 W / 117 W universal input power output capability with
PCB / metal heat sink
Low profile horizontal orientation for ultra-slim designs
Heat transfer to both PCB and heat sink
Optional external heat sink provides thermal impedance
equivalent to a TO-220
eSIP-7C package:
177 W universal input output power capability
Vertical orientation for minimum PCB footprint
Simple heat sink mounting using clip provides thermal
impedance equivalent to a TO-220
eSOP-12 package:
66 W universal input output power capability
Low profile surface mounted for ultra-slim designs
Heat transfer to PCB via exposed pad and SOURCE pins
Supports wave or reflow soldering
Extended creepage to DRAIN pin
Heat sink is connected to SOURCE for low EMI
eSIP-7C (E Package) eSOP-12B (K Package)
Figure 2. Package Options.
eDIP-12B (V Package)
Description
TOPSwitch-JX cost effectively incorporates a 725 V power
MOSFET, high-voltage switched current source, multi-mode
PWM control, oscillator, thermal shutdown circuit, fault
protection and other control circuitry onto a monolithic device.
Typical Applications
Notebook or laptop adapter
Generic adapter
Printer
LCD monitor
Set-top box
PC or LCD TV standby
Audio amplifier
Output Power Ratings
See next page.
www.powerint.com
August 2012




TOP266KG pdf, 반도체, 판매, 대치품
TOP264-271
+
DC
Input
Voltage
-
VUV = IUV × RLS + VV (IV = IUV)
VOV = IOV × RLS + VV (IV = IOV)
RLS
4 M
For RLS = 4 M
VUV = 102.8 VDC
VOV = 451 VDC
D
V
DCMAX@100 VDC = 76%
DCMAX@375 VDC = 41%
CONTROL
C
SX
For RIL = 12 k
ILIMIT = 61%
RIL
12 k
See Figure 37 for
other resistor values
(RIL) to select different
ILIMIT values.
Figure 5. Package Line Sense and Externally Set Current Limit.
Auto-Restart
78
Slope = PWM Gain
CONTROL
Current
100
TOP264-271 Functional Description
Like TOPSwitch-HX, TOP264-271 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 6.
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 and thermal shut-
down, the TOP264-271 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, VOLTAGE-MONITOR, and
EXTERNAL CURRENT LIMIT have been used to implement
some of the new functions. These terminals can be connected
to the SOURCE pin to operate the TOP264-271 in a TOPSwitch-
like three terminal mode. However, even in this three terminal
mode, the TOP264-271 offers many transparent features that do
not require any external components:
1. A fully integrated 17 ms soft-start significantly reduces or
eliminates output overshoot in most applications by sweeping
both current limit and frequency from low to high to limit the
peak currents and voltages during start-up.
2. sAtomraagxeimcuampadcuittoyr,clyocwleer(DinCpMuAtX)vooflt7ag8e%reaqllouwiresmsemnatllaenrdin/oprut
higher power capability.
3. Multi-mode operation optimizes and improves the power
supply efficiency over the entire load range while maintaining
good cross regulation in multi-output supplies.
4. Switching frequency of 132 kHz reduces the transformer size
with no noticeable impact on EMI.
5. Frequency jittering reduces EMI in the full frequency mode at
high load condition.
55
25
Full Frequency Mode
CONTROL
Current
132 Low
Variable
Frequency
Frequency
Mode
66 Mode
Jitter
Multi-Cycle
Modulation
30
ICD1 IB
IC01
IC02
IC03
ICOFF
CONTROL
Current
PI-5665-110609
Figure 6. Control Pin Characteristics (Multi-Mode Operation).
6. Hysteretic over-temperature shutdown ensures thermal fault
protection.
7. Packages with omitted pins and lead forming provide large
drain creepage distance.
8. Reduction of the auto-restart duty cycle and frequency to
improve the protection of the power supply and load during
open loop fault, short-circuit, or loss of regulation.
9. Tighter tolerances on I2f power coefficient, current limit
reduction, PWM gain and thermal shutdown threshold.
The VOLTAGE-MONITOR (V) pin is usually used for line sensing
by connecting a 4 MW resistor from this pin to the rectified DC
high-voltage bus to implement line overvoltage (OV), under-
voltage (UV) and dual-slope line feed-forward with DCMAX
reduction. In this mode, the value of the resistor determines the
OV/UV thresholds and the DCMAX is reduced linearly with a dual
slope to improve line ripple rejection. In addition, it also
provides another threshold to implement the latched and
4
Rev. E 08/12
www.powerint.com

4페이지










TOP266KG 전자부품, 판매, 대치품
TOP264-271
VLINE
0V
VUV
VC
0V
VDRAIN
0V
S15 S14
S13 S12
S0 S15 S14 S13 S12
S0 S15
S14 S13 S12 S0 S15 S15 5.8 V
4.8 V
VOUT
0V
12
3
Note: S0 through S15 are the output states of the auto-restart counter
2
Figure 8. Typical Waveforms for (1) Power Up (2) Normal Operation (3) Auto-Restart (4) Power Down.
4
PI-4531-121206
UV prevents auto-restart attempts after the output goes out of
regulation. This eliminates power down glitches caused by slow
discharge of the large input storage capacitor present in
applications such as standby supplies. A single resistor
connected from the VOLTAGE-MONITOR pin 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 44% 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 (S15), 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 the OV feature.
Line Overvoltage Shutdown (OV)
The same resistor used for UV also sets an overvoltage
threshold, which, once exceeded, will force TOP264-271 to
stop switching instantaneously (after completion of the current
switching cycle). If this condition lasts for at least 100 ms, the
TOP264-271 output will be forced into off state. When the line
voltage is back to normal with a small amount of hysteresis
provided on the OV threshold to prevent noise triggering, the
state machine sets to S13 and forces TOP264-271 to go
through the entire auto-restart sequence before attempting to
switch again. The ratio of OV and UV thresholds is preset at
4.5, as can be seen in Figure 9. When the MOSFET is off, the
rectified DC high-voltage surge capability is increased to the
voltage rating of the MOSFET (725 V), due to the absence of the
reflected voltage and leakage spikes on the drain. The OV
feature can be disabled independent of the UV feature.
In order to reduce the no-load input power of TOP264-271
designs, the V pin operates at very low currents. This requires
careful layout considerations when designing the PCB to avoid
noise coupling. Traces and components connected to the V pin
should not be adjacent to any traces carrying switching currents.
These include the drain, clamp network, bias winding return or
power traces from other converters. If the line sensing features
are used, then the sense resistors must be placed within 10 mm
of the V pin to minimize the V pin node area. The DC bus
should then be routed to the line sense resistors. Note that
external capacitance must not be connected to the V pin as this
may cause misoperation of the V pin related functions.
Hysteretic or Latching Output Overvoltage Protection (OVP)
The detection of the hysteretic or latching output overvoltage
protection (OVP) is through the trigger of the line overvoltage
threshold. The V pin voltage will drop by 0.5 V, and the
controller measures the external attached impedance immediately
alofntegretrhtishavnol1ta0g0emdsr,oTpOs.P2If6I4V -e2x7c1eewdilsl laIOtVc(LhS)
(336 mA typical)
into a permanent
off
=s(VtaC-2(tRe7ESfEmoTAr)) ta(htneydpla)tthocerhnVinCbggaOcokeVsPto.bneItoloorwmnlyathl.ceaIpfnoIVbwdeeorree-usspent-orieft sIeXexetcxtehceeredesdIhOsVo(LIlXdS()ToH)r
exceeds no longer than 100 ms, TOP264-271 will initiate the line
overvoltage and the hysteretic OVP. Their behavior will be
identical to the line overvoltage shutdown (OV) that has been
described in detail in the previous section. During a fault
condition resulting from loss of feedback, output voltage will
rapidly rise above the nominal voltage. The increase in output
voltage will also result in an increase in the voltage at the output
of the bias winding. A voltage at the output of the bias winding
that exceeds of the sum of the voltage rating of the Zener diode
connected from the bias winding output to the V pin and V pin
voltage, will cause a
the V pin, which will
current in
trigger the
eOxVcePsfseaotfuIrVet.o
be
injected
into
www.powerint.com
7
Rev. E 08/12

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TOP266KG

Integrated Off-Line Switcher with EcoSmart Technology

Power Integrations
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