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| 型號： | TOP249FN-TL |
| 廠商： | POWER INTEGRATIONS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8.64 A SWITCHING REGULATOR, 140 kHz SWITCHING FREQ-MAX, PZIP6 |
| 封裝： | LEAD FREE, PLASTIC, TO-262, 7/6 PIN |
| 文件頁數(shù)： | 13/52頁 |
| 文件大小： | 2175K |
| 代理商： | TOP249FN-TL |
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TOP242-250
N
4/05
20
Figure 41. 30 W Power Supply using External Current Limit Programming and Line Sensing for UV and OV.
12 V @
2.5 A
D2
1N4148
T1
C5
47
F
10 V
U2
LTV817A
VR2
1N5240C
10 V, 2%
R6
150
R15
150
C14
1 nF
D1
UF4005
R3
68 k
2 W
C3
4.7 nF
1 kV
CY1
2.2 nF
U1
TOP244Y
D
L
S
X
F
C
R8
150
C1
68
F
400 V
C6
0.1
F
D8
MBR1060
C10
560
F
35 V
C12
220
F
35 V
C11
560
F
35 V
RTN
R5
6.8
R1
4.7 M
1/2 W
R4
2 M
1/2 W
R2
9.09 k
PI-2657-081204
L3
3.3
H
BR1
600 V
2A
F1
3.15 A
J1
L1
20 mH
L
N
CX1
100 nF
250 VAC
CONTROL
TOPSwitch-GX
PERFORMANCE SUMMARY
Output Power:
30 W
Regulation:
± 4%
Efficiency:
≥ 79%
Ripple:
≤ 50 mV pk-pk
Application Examples
A High Efciency, 30 W, Universal Input Power Supply
The circuit shown in Figure 41 takes advantage of several of
the TOPSwitch-GX features to reduce system cost and power
supply size and to improve efciency. This design delivers
30 W at 12 V, from an 85 VAC to 265 VAC input, at an ambient
of 50 °C, in an open frame conguration. Anominal efciency
of 80% at full load is achieved using TOP244Y.
The current limit is externally set by resistors R1 and R2 to a
value just above the low line operating peak DRAIN current
of approximately 70% of the default current limit. This
allows use of a smaller transformer core size and/or higher
transformer primary inductance for a given output power,
reducing TOPSwitch-GX power dissipation, while at the same
time avoiding transformer core saturation during startup and
output transient conditions. The resistors R1 & R2 provide a
signalthatreducesthecurrentlimitwithincreasinglinevoltage,
which in turn limits the maximum overload power at high input
line voltage. This function in combination with the built-in
soft-startfeatureofTOPSwitch-GX,allowstheuseofalowcost
RCD clamp (R3, C3 and D1) with a higher reected voltage,
by safely limiting the TOPSwitch-GX drain voltage, with
adequate margin under worst case conditions. Resistor R4
provides line sensing, setting UV at 100 VDC and OV at
450 VDC. The extended maximum duty cycle feature of
TOPSwitch-GX
(guaranteed minimum value of 75% vs. 64%
for TOPSwitch-II) allows the use of a smaller input capacitor
(C1). The extended maximum duty cycle and the higher
reected voltage possible with the RCD clamp also permit
the use of a higher primary to secondary turns ratio for T1,
which reduces the peak reverse voltage experienced by the
secondary rectier D8. As a result a 60 V Schottky rectier
can be used for up to 15 V outputs, which greatly improves
power supply efciency.The frequency reduction feature of the
TOPSwitch-GX
eliminates the need for any dummy loading
for regulation at no load and reduces the no-load/standby
consumption of the power supply. Frequency jitter provides
improved margin for conducted EMI, meeting the CISPR 22
(FCC B) specication.
Output regulation is achieved by using a simple Zener sense
circuit for low cost. The output voltage is determined by the
Zener diode (VR2) voltage and the voltage drops across the
optocoupler (U2) LED and resistor R6. Resistor R8 provides
bias current to Zener VR2 for typical regulation of ±5% at
the 12 V output level, over line and load and component
variations.
AHigh Efciency, Enclosed, 70 W, UniversalAdapter Supply
The circuit shown in Figure 42 takes advantage of several of the
TOPSwitch-GX
features to reduce cost, power supply size and
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TOP249F-TL | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher |
| TOP249G- | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher |
| TOP249GN- | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher |
| TOP249GN-TL | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher |
| TOP249G-TL | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher |
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