參數(shù)資料
型號(hào)： TOP250R
英文描述： Up to 290 W Extended power. design flexible.
中文描述： 高達(dá)290瓦的擴(kuò)展能力。設(shè)計(jì)靈活。
文件頁(yè)數(shù)： 22/52頁(yè)
文件大?。?/td> 468K
代理商： TOP250R
TOP242-250
22
K
9/03
General Information & Table of Contents
discharge path for C14. Capacitor C13 and R8 provide control
loop compensation and are required due to the gain associated
with such a high output voltage.
Application Notes 3
Design Ideas 4
L2
3
μ
H
8A
Design Tools 5
C12
68
μ
F
Quality and Reliability 6
Package Information 7
DPA-SwitchDC-DC Seminar 8
R6
100
C13
150 nF
63 V
VR2 22 V
BZX79B22
LinkSwitch & TinySwitch-IIAC-DC Seminar 9
CONTROL
250 W
±
1%
±
5%
≥
85%
<
100 mV pk-pk
No Load Consumption:
≤
1.4 W (300 VDC)
TOPSwitch-GXAC-DC Seminar 10
C3
0.1
μ
F
50 V
47
μ
F
10 V
BZX79B12
A High Efficiency, 250 W, 250-380 VDC Input Power Supply
The circuit shown in figure 43 delivers 250 W (48 V @ 5.2 A)
at 84% efficiency using a TOP249 from a 250 to 380 VDC
input. DC input is shown, as typically at this power level a
p.f.c. boost stage would preceed this supply, providing the DC
input (C1 is included to provide local decoupling). Flyback
topology is still useable at this power level due to the high
output voltage, keeping the secondary peak currents low enough
so that the output diode and capacitors are reasonably sized.
In this example the TOP249 is at the upper limit of its power
capability and the current limit is set to the internal maximum
by connecting the X pin to SOURCE. However, line sensing
is implemented by connecting a 2 M
resistor from the L pin
to the DC rail. If the DC input rail rises above 450 VDC, then
TOPSwitch-GX
will stop switching until the voltage returns to
normal, preventing device damage.
Due to the high primary current, a low leakage inductance
transformer is essential. Therefore, a sandwich winding with
a copper foil secondary was used. Even with this technique
the leakage inductance energy is beyond the power capability
of a simple Zener clamp. Therefore, R2, R3 and C6 are added
in parallel to VR1. These have been sized such that during
normal operation very little power is dissipated by VR1, the
leakage energy instead being dissipated by R2 and R3.
However, VR1 is essential to limit the peak drain voltage
during start-up and/or overload conditions to below the 700 V
rating of the
TOPSwitch-GX
MOSFET.
The secondary is rectifed and smoothed by D2 and C9, C10
and C11. Three capacitors are used to meet the secondary ripple
current requirement. Inductor L2 and C12 provide switching
noise filtering.
A simple Zener sensing chain regulates the output voltage. The
sum of the voltage drop of VR2, VR3 and VR4 plus the LED
drop of U2 gives the desired output voltage. Resistor R6
limits LED current and sets overall control loop DC gain.
Diode D4 and C14 provide secondary soft-finish, feeding
current into the CONTROL pin prior to output regulation and
thus ensuring that the output voltage reaches regulation at start-
up under low line, full load conditions. Resistor R9 provides a
Sufficient heat sinking is required to keep the
TOPSwitch-GX
device below 110
°
C when operating under full load, low line
and maximum ambient temperature. Airflow may also be
required if a large heat sink area is not acceptable.
Figure 43. 250 W, 48 V Power Supply using TOP249.
+250 - 380 VDC
0 V
S
X
F
C
RTN
PI-2692-042203
All resistor 1/8 W 5% unless
otherwise stated.
TOP249Y
U1
C1
22
μ
F
400 V
R4
R8
56
R9
C3
C6
4.7 nF
1 kV
1
μ
F
C14
22
μ
F
63 V
C9
560
μ
F
63 V
C10
560
μ
F
63 V
C11
560
μ
F
63 V
C7
2.2 nF Y1
D2
MUR1640CT
D2
1N4148
LTV817A
D1
BYV26C
T1
R1
2 M
1/2 W
R3
68 k
2 W
R2
68 k
2 W
VR1
P6KE200
VR3 12 V
BZX79B12
VR4 12 V
1N4148
PERFORMANCE SUMMARY
Output Power:
Line Regulation:
Load Regulation:
Efficiency:
Ripple:
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TOP250R- 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
TOP250RN- 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
TOP250RN-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
TOP250R-TL 功能描述:交流/直流開(kāi)關(guān)轉(zhuǎn)換器 55 W 85-265 VAC 82 W 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(kāi)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
TOP250Y 功能描述:交流/直流開(kāi)關(guān)轉(zhuǎn)換器 210 W 85-265 VAC 290 W 230 VACX 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(kāi)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
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