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参数资料
| 型号： | TNY279GN |
| 厂商： | Power Integrations |
| 文件页数： | 7/24页 |
| 文件大小： | 0K |
| 描述： | IC OFFLINE SWIT OVP OTP HV 8SMD |
| 标准包装： | 50 |
| 系列： | TinySwitch®-III |
| 输出隔离： | 隔离 |
| 频率范围： | 124kHz ~ 140kHz |
| 输出电压： | 700V |
| 功率（瓦特）： | 32W |
| 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-8C |
| 包装： | 管件 |
| 配用： | 596-1194-ND - KIT DESIGN REF TINYSWITCH-III |
TNY274-280
Power Up/Down
The TinySwitch-III requires only a 0.1 μ F capacitor on the
BYPASS/MULTI-FUNCTION pin to operate with standard
current limit. Because of its small size, the time to charge this
capacitor is kept to an absolute minimum, typically 0.6 ms. The
time to charge will vary in proportion to the BYPASS/MULTI-
FUNCTION pin capacitor value when selecting different current
limits. Due to the high bandwidth of the ON/OFF feedback,
there is no overshoot at the power supply output. When an
external resistor (4 M Ω ) is connected from the positive DC input
to the EN/UV pin, the power MOSFET switching will be delayed
during power up until the DC line voltage exceeds the threshold
(100 V). Figures 10 and 11 show the power up timing waveform
in applications with and without an external resistor (4 M Ω )
connected to the EN/UV pin.
Under startup and overload conditions, when the conduction
time is less than 400 ns, the device reduces the switching
frequency to maintain control of the peak drain current.
During power down, when an external resistor is used, the
power MOSFET will switch for 64 ms after the output loses
regulation. The power MOSFET will then remain off without any
glitches since the undervoltage function prohibits restart when
the line voltage is low.
Figure 12 illustrates a typical power down timing waveform.
Figure 13 illustrates a very slow power down timing waveform
as in standby applications. The external resistor (4 M Ω ) is
connected to the EN/UV pin in this case to prevent unwanted
restarts.
No bias winding is needed to provide power to the chip
because it draws the power directly from the DRAIN pin (see
www.powerint.com
Functional Description). This has two main bene?ts. First, for a
nominal application, this eliminates the cost of a bias winding
and associated components. Secondly, for battery charger
applications, the current-voltage characteristic often allows the
output voltage to fall close to zero volts while still delivering
power. TinySwitch-III accomplishes this without a forward bias
winding and its many associated components. For applications
that require very low no-load power consumption (50 mW), a
resistor from a bias winding to the BYPASS/MULTI-FUNCTION
pin can provide the power to the chip. The minimum
recommended current supplied is 1 mA. The BYPASS/MULTI-
FUNCTION pin in this case will be clamped at 6.4 V. This
method will eliminate the power draw from the DRAIN pin,
thereby reducing the no-load power consumption and
improving full-load ef ?ciency.
Current Limit Operation
Each switching cycle is terminated when the DRAIN current
reaches the current limit of the device. Current limit operation
provides good line ripple rejection and relatively constant power
delivery independent of input voltage.
BYPASS/MULTI-FUNCTION Pin Capacitor
The BYPASS/MULTI-FUNCTION pin can use a ceramic
capacitor as small as 0.1 μ F for decoupling the internal power
supply of the device. A larger capacitor size can be used to
adjust the current limit. For TNY275-280, a 1 μ F BP/M pin
capacitor will select a lower current limit equal to the standard
current limit of the next smaller device and a 10 μ F BP/M pin
capacitor will select a higher current limit equal to the standard
current limit of the next larger device. The higher current limit
level of the TNY280 is set to 850 mA typical. The TNY274
MOSFET does not have the capability for increased current limit
so this feature is not available in this device.
7
Rev. I 01/09
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TNY279GN0152-TL | 制造商:Power Integrations 功能描述: |
| TNY279GN-TL | 功能描述:交流/直流开关转换器 25W 85-265 VAC 32W/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 |
| TNY279GTL | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:Energy Efficient, Off-Line Switcher with Enhanced Flexibility and Extended Power Range |
| TNY279P | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:Energy Efficient, Off-Line Switcher with Enhanced Flexibility and Extended Power Range |
| TNY279PG | 功能描述:交流/直流开关转换器 25 W (85-265 VAC) 32 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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