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| 型号： | TOP246FN |
| 厂商： | Power Integrations |
| 文件页数： | 22/52页 |
| 文件大小： | 0K |
| 描述： | IC OFFLINE SWIT UVLO HV TO262 |
| 标准包装： | 50 |
| 系列： | TOPSwitch®-GX |
| 输出隔离： | 隔离 |
| 频率范围： | 66 ~ 132kHz |
| 输出电压： | 700V |
| 功率（瓦特）： | 125W |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | TO-262-7（成形引线），6 引线 |
| 供应商设备封装： | TO-262-7C |
| 包装： | 管件 |
| 产品目录页面： | 1204 (CN2011-ZH PDF) |
| 其它名称： | 596-1168 TOP246FN-ND |
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TOP242-250
A High Ef?ciency, 250 W, 250-380 VDC Input Power Supply
The circuit shown in Figure 43 delivers 250 W (48 V @
5.2 A) at 84% ef?ciency using a TOP249 from a 250 VDC 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 usable 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 ?ltering.
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-?nish, 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
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.
Suf?cient heat sinking is required to keep the TOPSwitch-GX
device below 110 ° C when operating under full load, low line
and maximum ambient temperature. Air?ow may also be
required if a large heatsink area is not acceptable.
+250-380
VDC
VR1
P6KE200
R2
68 k ?
2 W
R3
68 k ?
2 W
C6
4.7 nF
1 kV
C7
2.2 nF Y1
D2
MUR1640CT
C10
560 μ F
63 V
C11
560 μ F
63 V
L2
3 μ H 8A
48 V@
5.2 A
C9
560 μ F
63 V
C12
68 μ F
63 V
C1
22 μ F
400 V
R1
2 M ?
1/2 W
D1
BYV26C
D2
1N4148
T1
TOPSwitch-GX
C4
1 μ F
50 V
U2
LTV817A
R6
100 ?
R9
10 k ?
RTN
PERFORMANCE SUMMARY
Output Power: 250 W
Line Regulation: ± 1%
Load Regulation: ± 5%
Efficiency: ≥ 85%
Ripple: < 100 mV pk-pk
No Load Consumption: ≤ 1.4 W (300 VDC)
D
S
L TOP249Y
U1
CONTROL
C
X F
C3
0.1 μ F
50 V
R4
6.8 ?
C3
47 μ F
10 V
C13
150 nF
63 V
VR2 22 V
BZX79B22
VR3 12 V
BZX79B12
VR4 12 V
BZX79B12
R8
56 ?
D4
1N4148
C14
22 μ F
63 V
0 V
Figure 43. 250 W, 48 V Power Supply using TOP249.
22
O
11/05
All resistor 1/8 W 5% unless
otherwise stated.
PI-2692-081204
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TOP246FN- | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher |
| TOP246FN-TL | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher |
| TOP246F-TL | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher |
| TOP246G- | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher |
| TOP246GN | 功能描述:交流/直流开关转换器 22W 85-265 VAC 30 W 230 VAC RoHS:否 制造商:STMicroelectronics 输出电压:800 V 输入/电源电压（最大值）:23.5 V 输入/电源电压（最小值）:11.5 V 开关频率:115 kHz 电源电流:1.6 mA 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:SSO-10 封装:Reel |
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