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| 型号： | TOP269EG |
| 厂商： | Power Integrations |
| 文件页数： | 19/40页 |
| 文件大小： | 0K |
| 描述： | IC OFFLINE SW PWM OCP OVP 7ESIP |
| 特色产品： | TopSwitch?-JX Integrated Switcher Ics |
| 标准包装： | 48 |
| 输出隔离： | 隔离 |
| 频率范围： | 66 ~ 132kHz |
| 输出电压： | 725V |
| 功率（瓦特）： | 120W |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 7-SIP，6 引线，裸露焊盘，成形引线 |
| 供应商设备封装： | eSIP-7C |
| 包装： | 管件 |
| 其它名称： | 596-1278-5 |
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TOP264-271
TOPSwitch-HX vs. TOPSwitch-JX
Function
CONTROL current I C(OFF) at
0% duty cycle
eDIP-12 / eSOP-12
packages
TOPSwitch-HX
I C(OFF) = I B + 3.4 mA
(TOP256-258)
I B = External bias current
Not available
TOPSwitch-JX
I C(OFF) = I B + 1.6 mA
(TOP266-268)
Available
TOPSwitch-JX Advantages
? Reduced CONTROL current
? Better no-load performance (<0.1 W)
? Better standby performance
? 66/132 kHz frequency option for DIP style heat sink
less designs
? Better thermal performance for increased power
capability over DIP-8 / SMD-8 packages
Breakdown voltage BV DSS
Min. 700 V at T J = 25 °C
Min. 725 V at T J = 25 °C
? Simplifies meeting customer derating requirements
(e.g. 80%)
? Extended line surge withstand
Fast AC reset
3 external transistor circuits
using the V pin
1 external transistor circuit
using the X pin
? Saves 5 components
Table 3.
Comparison Between TOPSwitch-HX and TOPSwitch-JX.
6. Power levels shown in the power table for the V package
device assume 6.45 cm 2 of 610 g/m 2 copper heat sink area
in an enclosed adapter, or 19.4 cm 2 in an open frame.
The provided peak power depends on the current limit for the
respective device.
TOP264-271 Selection
Selecting the optimum TOP264-271 depends upon required
maximum output power, efficiency, heat sinking constraints,
system requirements and cost goals. With the option to
externally reduce current limit, TOP264-271 may be used for
lower power applications where higher efficiency is needed or
minimal heat sinking is available.
Input Capacitor
The input capacitor must be chosen to provide the minimum
DC voltage required for the TOP264-271 converter to maintain
regulation at the lowest specified input voltage and maximum
output power. Since TOP264-271 has a high DC MAX limit and an
optimized dual slope line feed forward for ripple rejection, it is
possible to use a smaller input capacitor. For TOP264-271, a
capacitance of 2 m F per watt is possible for universal input with
an appropriately designed transformer.
Primary Clamp and Output Reflected Voltage V OR
A primary clamp is necessary to limit the peak TOP264-271 drain
to source voltage. A Zener clamp requires few parts and takes
up little board space. For good efficiency, the clamp Zener
should be selected to be at least 1.5 times the output reflected
voltage V OR , as this keeps the leakage spike conduction time
short. When using a Zener clamp in a universal input application,
a V OR of less than 135 V is recommended to allow for the absolute
tolerances and temperature variations of the Zener. This will
ensure efficient operation of the clamp circuit and will also keep
the maximum drain voltage below the rated breakdown voltage
of the TOP264-271 MOSFET. A high V OR is required to take full
advantage of the wider DC MAX of TOP264-271. An RCD (or
RCDZ) clamp provides tighter clamp voltage tolerance than a
Zener clamp and allows a V OR as high as 150 V. RCD clamp
www.powerint.com
dissipation can be minimized by reducing the external current
limit as a function of input line voltage (see Figure 19). The RCD
clamp is more cost effective than the Zener clamp but requires
more careful design (see Quick Design Checklist).
Output Diode
The output diode is selected for peak inverse voltage, output
current, and thermal conditions in the application (including heat
sinking, air circulation, etc.). The higher DC MAX of TOP264-271,
along with an appropriate transformer turns ratio, can allow the
use of a 80 V Schottky diode for higher efficiency on output
voltages as high as 15 V.
Bias Winding Capacitor
Due to the low frequency operation at no-load, a bias winding
capacitance of 10 m F minimum is recommended. Ensure a
minimum bias winding voltage of >9 V at zero load for correct
operation and output voltage regulation.
Soft-Start
Generally, a power supply experiences maximum stress at
start-up before the feedback loop achieves regulation. For a
period of 17 ms, the on-chip soft-start linearly increases the
drain peak current and switching frequency from their low
starting values to their respective maximum values. This
causes the output voltage to rise in an orderly manner, allowing
time for the feedback loop to take control of the duty cycle.
This reduces the stress on the TOP264-271 MOSFET, clamp
circuit and output diode(s), and helps prevent transformer
saturation during start-up. Also, soft-start limits the amount of
output voltage overshoot and, in many applications, eliminates
the need for a soft-finish capacitor. Note that as soon as the
loop closes the soft-start function ceases even if this is prior to
the end of the 17 ms soft-start period.
EMI
The frequency jitter feature modulates the switching frequency
over a narrow band as a means to reduce conducted EMI peaks
associated with the harmonics of the fundamental switching
frequency. This is particularly beneficial for average detection
19
Rev. E 08/12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TOP269EG/VG | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:Integrated Off-Line Switcher with EcoSmart Technology for Highly Efficient Power Supplies |
| TOP269EG-TL | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:Integrated Off-Line Switcher with EcoSmart Technology for Highly Efficient Power Supplies |
| TOP269KG | 功能描述:交流/直流开关转换器 Int Off-Line Switchr EcoSmart,55W/81W 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 |
| TOP269KG-TL | 功能描述:交流/直流开关转换器 Int Off-Line Switchr EcoSmart,55W/81W 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 |
| TOP269VG | 功能描述:交流/直流开关转换器 Int Off-Line Switchr 120W/162W 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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