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参数资料
| 型号： | TOP244G |
| 厂商： | Power Integrations |
| 文件页数： | 20/52页 |
| 文件大小： | 0K |
| 描述： | IC OFFLINE SWIT OVP UVLO HV 8SMD |
| 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）： | 28W |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 8-SMD（7 个接脚），鸥形翼 |
| 供应商设备封装： | SMD-8B |
| 包装： | 管件 |
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TOP242-250
Application Examples
A High Ef?ciency, 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 ef?ciency. 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 con?guration. A nominal ef?ciency
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
signal that reduces the current limit with increasing line voltage,
which in turn limits the maximum overload power at high input
line voltage. This function in combination with the built-in
soft-start feature of TOPSwitch-GX , allows the use of a low cost
RCD clamp (R3, C3 and D1) with a higher re?ected 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
PERFORMANCE SUMMARY
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
re?ected 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 recti?er D8. As a result a 60 V Schottky recti?er
can be used for up to 15 V outputs, which greatly improves
power supply ef?ciency. 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) speci?cation.
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.
A High Ef?ciency, Enclosed, 70 W, Universal Adapter Supply
The circuit shown in Figure 42 takes advantage of several of the
TOPSwitch-GX features to reduce cost, power supply size and
Output Power:
Regulation:
Efficiency:
Ripple:
30 W
± 4%
≥ 79%
≤ 50 mV pk-pk
CY1
2.2 nF
C14 R15
1 nF 150 ?
BR1
600 V
2A
C3
4.7 nF
1 kV
D1
UF4005
R3
68 k ?
2 W
D8
MBR1060
C10
560 μ F
35 V
C11
560 μ F
35 V
L3
3.3 μ H
12 V @
2.5 A
C12
220 μ F
35 V
RTN
L1
20 mH
CX1
100 nF
250 VAC
C1
68 μ F
400 V
R4
2 M ?
1/2 W
R1
4.7 M ?
1/2 W
D
L
CONTROL
D2
1N4148
T1
TOPSwitch-GX
U1
TOP244Y
C
C6
0.1 μ F
R6
150 ?
R8
150 ?
U2
LTV817A
J1
L
N
F1
3.15 A
R2
9.09 k ?
S
X
F
C5
47 μ F
10 V
R5
6.8 ?
VR2
1N5240C
10 V, 2%
PI-2657-081204
Figure 41. 30 W Power Supply using External Current Limit Programming and Line Sensing for UV and OV.
20
O
11/05
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TOP244G- | 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 |
| TOP244GN | 功能描述:交流/直流开关转换器 20 W 85-265 VAC 28 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 |
| TOP244GN- | 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 |
| TOP244GN-TL | 功能描述:交流/直流开关转换器 20 W 85-265 VAC 28 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 |
| TOP244G-TL | 功能描述:IC OFFLINE SWIT OVP UVLO HV 8SMD RoHS:否 类别:集成电路 (IC) >> PMIC - AC-DC 转换器，离线开关 系列:TOPSwitch®-GX 标准包装:1 系列:FPS™ 输出隔离:隔离 频率范围:61kHz ~ 73kHz 输入电压:8 V ~ 26 V 输出电压:650V 功率（瓦特）:12W 工作温度:-40°C ~ 115°C 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-MDIP 包装:Digi-Reel® 其它名称:FSL206MRBNFSDKR |
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