參數(shù)資料
型號(hào)： TOP243Y
廠商： POWER INTEGRATIONS INC
元件分類： 穩(wěn)壓器
英文描述： Family Extended Power, Design Flexible,Integrated Off-line Switcher
中文描述： 1.44 A SWITCHING REGULATOR, 140 kHz SWITCHING FREQ-MAX, PZFM6
封裝： PLASTIC, TO-220, 7/6 PIN
文件頁數(shù)： 24/48頁
文件大?。?/td> 771K
代理商： TOP243Y
TOP242-249
24
E
7/01
August 8, 2000
Multiple Output, 60 W, 185-265 VAC Input Power Supply
Figure 44 shows a multiple output supply typical for high end
set-top boxes or cable decoders containing high capacity hard
disks for recording. The supply delivers an output power of
45 W cont./60 W peak (thermally limited) from an input voltage
of 185 to 265 VAC. Efficiency at 45 W, 185 VAC is
≥
75%.
The 3.3 V and 5 V outputs are regulated to
±
5% without the need
for secondary linear regulators. DC stacking (the secondary
winding reference for the other output voltages is connected to
the cathode of D10 rather than the anode) is used to minimize
the voltage error for the higher voltage outputs.
Due to the high ambient operating temperature requirement
typical of a set-top box (60
°
C) the TOP246Y is used to reduce
conduction losses and minimize heat sink size. Resistor R2 sets
the device current limit to 80% of typical to limit overload
power. The line sense resistor (R1) protects the
TOPSwitch-GX
from line surges and transients by sensing when the DC rail
voltage rises to above 450 V. In this condition the
TOPSwitch-GX
stops switching, extending the input voltage
withstand to 496 VAC which is ideal for countries with poor
power quality. A thermistor (RT1) is used to prevent premature
failure of the fuse by limiting the inrush current (due to the
relatively large size of C2). An optional MOV (RV1) extends
the differential surge protection to 6 kV from 4 kV.
Leakage inductance clamping is provided by VR1, R5 and C5,
keeping the DRAIN voltage below 700 V under all conditions.
Resistor R5 and capacitor C5 are selected such that VR1
dissipates very little power except during overload conditions.
The frequency jittering feature of
TOPSwitch-GX
allows the
circuit shown to meet CISPR22B with simple EMI filtering
(C1, L1 and C6) and the output grounded.
The secondaries are rectified and smoothed by D7 to D11, C7,
C9, C11, C13, C14, C16 and C17. Diode D11 for the 3.3 V
output is a Schottky diode to maximize efficiency. Diode D10
for the 5 V output is a PN type to center the 5 V output at 5 V.
The 3.3 V and 5 V output require two capacitors in parallel to
meet the ripple current requirement. Switching noise filtering
is provided by L2 to L5 and C8, C10, C12, C15 and C18.
Resistor R6 prevents peak charging of the lightly loaded 30 V
output. The outputs are regulated using a secondary reference
(U3). Both the 3.3 V and 5 V outputs are sensed via R11 and
R10. Resistor R8 provides bias for U3 and R7 sets the overall
DC gain. Resistor R9, C19, R3 and C4 provide loop
compensation. A soft-finish capacitor (C20) eliminates output
overshoot.
Figure 44. 60 W Multiple Output Power Supply using TOP246.
1D6
D7
D8
D9
D11
D10
T1
LU2
U3
C20
22
μ
F
10 V
1R7
R12
C19
0.1
μ
F
k
k
R9
3.3 k
R8
1 k
C6
2.Y1
C7
47
μ
F
50 V
C9
325 V
μ
F
C11
335 V
μ
F
C14
125 V
μ
F
30 V @
18 V @
12 V @
5 V @
3.3 V @
RTN
D1-D4
1N4007 V
F1
3.15 A
1RV1
J1
L1
20 mH
0.8A
t
°
L
N
R3
6.8
C5
47
μ
F
10 V
TOP246Y
U1
D
L
S
C
TOPSwitch-GX
R1
2 M
R5
2 W
R6
10
RT1
10
C2
μ
F
68
4C5
C3
μ
F
1
C1
0.1
μ
F
X1
PI-2693-033001
CONTROL
C3
0.1
μ
F
50 V
9..R2
X
F
D6
1N4937
VR1
P6KE170
C16
125 V
μ
F
C13
125 V
μ
F
C17
125 V
μ
F
C15
165 V
μ
F
C18
216 V
μ
F
C12
125 V
μ
F
C10
125 V
μ
F
C8
10
μ
F
50 V
L2
3.3
μ
H
3A
L3
3.3
μ
H
3A
L4
3.3
μ
H
5A
L5
3.3
μ
H
5A
PERFORMANCE SUMMARY
Output Power:
Regulation:
3.3 V:
5 V:
12 V:
18 V:
30 V:
Efficiency:
No Load Consumption:
45 W Cont./60 W Peak
±
5%
±
5%
±
7%
±
7%
±
8%
≥
75%
0.6 W
1
相關(guān)PDF資料
PDF描述
TOP244R Family Extended Power, Design Flexible,Integrated Off-line Switcher
TOP244Y Family Extended Power, Design Flexible,Integrated Off-line Switcher
TOP245R Family Extended Power, Design Flexible,Integrated Off-line Switcher
TOP245Y Family Extended Power, Design Flexible,Integrated Off-line Switcher
TOP246R Family Extended Power, Design Flexible,Integrated Off-line Switcher
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TOP243Y- 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
TOP243Y/F 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Up to 290 W Extended power. design flexible.
TOP243YN 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 30W 85-265 VAC 45W 230 VAC RoHS:否 制造商:STMicroelectronics 輸出電壓:800 V 輸入/電源電壓（最大值）:23.5 V 輸入/電源電壓（最小值）:11.5 V 開關(guān)頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel
TOP243YN- 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
TOP243YN-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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