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PDF ( 数据手册 , 数据表 ) TOP262EN

零件编号 TOP262EN
描述 Integrated Off Line Switcher
制造商 Power Integrations
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TOP262EN 数据手册, 描述, 功能
TOP252-262
TOPSwitch-HX Family
Enhanced EcoSmart, Integrated Off-Line Switcher with
Advanced Feature Set and Extended Power Range
Product Highlights
Lower System Cost, Higher Design Flexibility
Multi-mode operation maximizes efficiency at all loads
New eSIP-7F and eSIP-7C packages
Low thermal impedance junction-to-case (2 °C per watt)
Low height is ideal for adapters where space is limited
Simple mounting using a clip to aid low cost manufacturing
Horizontal eSIP-7F package ideal for ultra low height adapter
and monitor applications
Extended package creepage distance from DRAIN pin to
adjacent pin and to heat sink
No heat sink required up to 35 W using P, G and M packages
with universal input voltage and up to 48 W at 230 VAC
Output overvoltage protection (OVP) is user programmable for
latching/non-latching shutdown with fast AC reset
Allows both primary and secondary sensing
Line undervoltage (UV) detection prevents turn-off glitches
Line overvoltage (OV) shutdown extends line surge limit
Accurate programmable current limit
Optimized line feed-forward for line ripple rejection
132 kHz frequency (254Y-258Y and all E/L packages) reduces
transformer and power supply size
Half frequency option for video applications
Frequency jittering reduces EMI filter cost
+
AC DC
IN OU-T
DV
TOPSwitch-HX
CONTROL
C
S XF
Figure 1. Typical Flyback Application.
PI-4510-100206
Heat sink is connected to SOURCE for low EMI
Improved auto-restart delivers <3% of maximum power in
short circuit and open loop fault conditions
Accurate hysteretic thermal shutdown function automatically
recovers without requiring a reset
Fully integrated soft-start for minimum start-up stress
Extended creepage between DRAIN and all other pins
improves field reliability
Output Power Table
Product5
230 VAC ±15%4
Adapter1
Open
Frame2
Peak3
TOP252PN/GN
TOP252MN
9W
15 W
21 W
21 W
85-265 VAC
Adapter1
Open
Frame2
6 W 10 W
Peak3
13 W
13 W
TOP253PN/GN
TOP253MN
15 W
25 W
38 W
43 W
9W
15 W
25 W
29 W
TOP254PN/GN
TOP254MN
16 W
28 W
47 W
62 W
11 W
20 W
30 W
40 W
TOP255PN/GN
TOP255MN
19 W
30 W
54 W
81 W
13 W
22 W
35 W
52 W
TOP256PN/GN
TOP256MN
21 W
34 W
63 W
98 W
15 W
26 W
40 W
64 W
TOP257PN/GN
TOP257MN
25 W
41 W
70 W
119 W
19 W
30 W
45 W
78 W
TOP258PN/GN
TOP258MN
29 W
48 W
77 W
140 W
22 W
35 W
50 W
92 W
Product5
TOP252EN/EG
230 VAC ±15%
Adapter1
Open
Frame2
10 W 21 W
85-265 VAC
Adapter1
Open
Frame2
6 W 13 W
TOP253EN/EG
21 W 43 W 13 W 29 W
TOP254EN/YN/EG 30 W 62 W 20 W 43 W
TOP255EN/YN/EG 40 W 81 W 26 W 57 W
TOP255LN
40 W 81 W 26 W 57 W
TOP256EN/YN/EG 60 W 119 W 40 W 86 W
TOP256LN
60 W 88 W 40 W 64 W
TOP257EN/YN/EG 85 W 157 W 55 W 119 W
TOP257LN
85 W 105 W 55 W 78 W
TOP258EN/YN/EG 105 W 195 W 70 W 148 W
TOP258LN
105 W 122 W 70 W 92 W
TOP259EN/YN/EG 128 W 238 W 80 W 171 W
TOP259LN
128 W 162 W 80 W 120 W
TOP260EN/YN/EG 147 W 275 W 93 W 200 W
TOP260LN
147 W 190 W 93 W 140 W
TOP261EN/YN/EG 177 W 333 W 118 W 254 W
TOP261LN
177 W 244 W 118 W 177 W
TOP262EN6
177 W 333 W 118 W 254 W
TOP262LN6
177 W 244 W 118 W 177 W
Table 1. Output Power Table. (for notes see page 2).
www.powerint.com
June 2013







TOP262EN pdf, 数据表
TOP252-262
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.
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. 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
OsloVp/UeVtothimrepsrhoovldeslinaendripthpeleDreCjeMcAXtioisnr.edInucaeddditliinoena, ritlyawlsioth a dual
provides another threshold to implement the latched and
hysteretic output overvoltage protection (OVP). The pin can
also be used as a remote ON/OFF using the IUV threshold.
The EXTERNAL CURRENT LIMIT (X) pin can be 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 input.
For the P and G package the VOLTAGE-MONITOR and
EXTERNAL CURRENT LIMIT pin functions are combined on
one MULTI-FUNCTION (M) pin. However, some of the functions
become mutually exclusive.
The FREQUENCY (F) pin in the TOP254-258 Y and E/L packages
set the switching frequency in the full frequency PWM mode 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 the CONTROL pin instead. Leaving this pin open is
not recommended. In the P, G and M packages and the
TOP259-261 Y packages, the frequency is set internally at
66 kHz in the full frequency PWM mode.
CONTROL (C) Pin Operation
The CONTROL pin is a low impedance node that is capable of
receiving a combined supply and feedback current. During
normal operation, a shunt regulator is used to separate the
feedback signal from the supply current. CONTROL pin voltage
VC is the supply voltage for the control circuitry including the
MOSFET gate driver. An external bypass capacitor closely
connected between the CONTROL and SOURCE pins is
required to supply the instantaneous gate drive current. The
total amount of capacitance connected to this pin also sets the
auto-restart timing as well as control loop compensation.
When rectified DC high voltage is applied to the DRAIN pin
during start-up, the MOSFET is initially off, and the CONTROL
pin capacitor is charged through a switched high voltage
current source connected internally between the DRAIN and
CONTROL pins. When the CONTROL pin
approximately 5.8 V, the control circuitry is
avoclttiavagteedVCarnedacthhees
soft-start begins. The soft-start circuit gradually increases the
drain peak current and switching frequency from a low starting
value to the maximum drain peak current at the full frequency
over approximately 17 ms. If no external feedback/supply
current is fed into the CONTROL pin by the end of the soft-start,
the high voltage current source is turned off and the CONTROL
pin will start discharging in response to the supply current
drawn by the control circuitry. If the power supply is designed
properly, and no fault condition such as open loop or shorted
output exists, the feedback loop will close, providing external
CONTROL pin current, before the CONTROL pin voltage has
had a chance to discharge to the lower threshold voltage of
approximately 4.8 V (internal supply undervoltage lockout
threshold). When the externally fed current charges the
CONTROL pin to the shunt regulator voltage of 5.8 V, current in
excess of the consumption of the chip is shunted to SOURCE
through an NMOS current mirror as shown in Figure 3. The
output current of that NMOS current mirror controls the duty
cycle of the power MOSFET to provide closed loop regulation.
The
sets
shunt regulator
the gain of the
ehrarosraafminpitleifileorwwohuetnpuutseimdpinedaapnrcime aZrCythat
feedback configuration.
CONTROL pin together
The
with
tdhyeneaxmteicrnimal pCeOdNanTcReOZLC
of the
pin
capacitance sets the dominant pole for the control loop.
When a fault condition such as an open loop or shorted output
prevents the flow of an external current into the CONTROL pin,
the capacitor on the CONTROL pin discharges towards 4.8 V.
At 4.8 V, auto-restart is activated, which turns the output
MOSFET off and puts the control circuitry in a low current
standby mode. The high-voltage current source turns on and
charges the external capacitance again. A hysteretic internal
supply undervoltage
typically 4.8 V to 5.8
comparator
V by turning
ktheeephsigVhC-vwoiltthaigneacwurinrednotw
of
source on and off as shown in Figure 11. The auto-restart
circuit has a divide-by-sixteen counter, which prevents the
output MOSFET from turning on again until sixteen discharge/
charge cycles have elapsed. This is accomplished by enabling
the output MOSFET only when the divide-by-sixteen counter
reaches the full count (S15). The counter effectively limits
TOPSwitch-HX power dissipation by reducing the auto-restart
duty cycle to typically 2%. Auto-restart mode continues until
output voltage regulation is again achieved through closure of
the feedback loop.
Oscillator and Switching Frequency
The internal oscillator linearly charges and discharges an
internal capacitance between two voltage levels to create a
triangular waveform for the timing of the pulse width modulator.
This oscillator sets the pulse width modulator/current limit latch
at the beginning of each cycle.
The nominal full switching frequency of 132 kHz was chosen to
minimize transformer size while keeping the fundamental EMI
frequency below 150 kHz. The FREQUENCY pin (available only
in TOP254-258 Y and E, L packages), when shorted to the
CONTROL pin, lowers the full switching frequency to 66 kHz
8
Rev. H 06/13
www.powerint.com







TOP262EN equivalent, schematic
TOP252-262
Typical Uses of VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) Pins
TOP252-258M TOP254-258Y
+
D CXV
DC
Input
Voltage
S S SS S
VXCS F D
D
DV
CONTROL
C
SC
C SD
- S XF
PI-4716-020508
Figure 16a. Three Terminal Operation (VOLTAGE MONITOR and EXTERNAL
CURRENT LIMIT Features Disabled. FREQUENCY Pin Tied to
SOURCE or CONTROL Pin) for TOP254-258 Y Packages.
+
TOP259-261Y
DC
Input
Voltage
DV
CONTROL
C
VXCSG D
CS D
- S XG
PI-4984-020708
Figure 16b. Three Terminal Operation (VOLTAGE MONITOR and EXTERNAL
CURRENT LIMIT Features Disabled for TOP259-261 Y Packages.
+
eSIP L Package eSIP E Package
DC
Input
Voltage
VXC FS D
C SD
DV
CONTROL
C
VXC FS D
C SD
- S XF
PI-4956-071708
Figure 16c. Three Terminal Operation (VOLTAGE MONITOR and EXTERNAL
CURRENT LIMIT Features Disabled. FREQUENCY Pin Tied to
SOURCE or CONTROL Pin) for TOP252-262 L and E Packages.
+
DC
Input
Voltage
VVUOVV
=
=
IIUOVV
×
×
RRLLSS
+
+
VVVV
((IIVV
=
=
IIUOVV))
RLS
4
M
For
VVRUOLVVS
=
=
=
4 M
102.8 VDC
451 VDC
DDCCMMAAXX@@130705
VDC
VDC
=
=
76%
41%
DV
CONTROL
C
-S
PI-4717-120307
Figure 17. Line-Sensing for Undervoltage, Overvoltage and Line Feed-Forward.
+
DC
Input
Voltage
Reset 10 k
VUV = IUV × RLS + VV (IV = IUV)
VOV = IOV × RLS + VV (IV = IOV)
For RLS = 4 M
RLS 4 M
VUV = 102.8 VDC
VOV = 451 VDC
Sense Output Voltage
D
QR
DCMAX @ 100 VDC = 76%
V DCMAX @ 375 VDC = 41%
CONTROL
C
-S
PI-4756-121007
Figure 18. Line-Sensing for Undervoltage, Overvoltage, Line Feed-Forward and
Latched Output Overvoltage Protection.
+
DC
Input
Voltage
VUV = IUV × RLS + VV (IV = IUV)
VOV = IOV × RLS + VV (IV = IOV)
For RLS = 4 M
VUV = 102.8 VDC
VOV = 451 VDC
RLS 4 M
Sense Output Voltage
VROVP
ROVP
DCMAX @ 100 VDC = 76%
DCMAX @ 375 VDC = 41%
DV
CONTROL
C
ROVP >3k
-S
PI-4719-120307
Figure 19. Line-Sensing for Undervoltage, Overvoltage, Line Feed-Forward and
Hysteretic Output Overvoltage Protection.
16
Rev. H 06/13
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