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| 型号： | TNY279GN |
| 厂商： | Power Integrations |
| 文件页数： | 9/24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
Undervoltage lockout is con?gured by R5 connected between
the DC bus and EN/UV pin of U1. When present, switching is
inhibited until the current in the EN/UV pin exceeds 25 μ A. This
allows the startup voltage to be programmed within the normal
operating input voltage range, preventing glitching of the output
under abnormal low voltage conditions and also on removal of
the AC input.
8. Increased current limit is selected for peak and open frame
power columns and standard current limit for adapter
columns.
9. The part is board mounted with SOURCE pins soldered to a
suf?cient area of copper and/or a heatsink is used to keep
the SOURCE pin temperature at or below 110 °C.
10. Ambient temperature of 50 °C for open frame designs and
40 °C for sealed adapters.
In addition to the simple input pi ?lter (C1, L1, C2) for differential
mode EMI, this design makes use of E-Shield? shielding
techniques in the transformer to reduce common mode EMI
displacement currents, and R2 and C4 as a damping network
to reduce high frequency transformer ringing. These
techniques, combined with the frequency jitter of TNY278, give
excellent conducted and radiated EMI performance with this
design achieving >12 dB μ V of margin to EN55022 Class B
conducted EMI limits.
For design ?exibility the value of C7 can be selected to pick one
of the 3 current limits options in U1. This allows the designer to
select the current limit appropriate for the application.
*Below a value of 1, K P is the ratio of ripple to peak primary
current. To prevent reduced power capability due to premature
termination of switching cycles a transient K P limit of ≥0.25 is
recommended. This prevents the initial current limit (I INIT ) from
being exceeded at MOSFET turn on.
For reference, Table 2 provides the minimum practical power
delivered from each family member at the three selectable
current limit values. This assumes open frame operation (not
thermally limited) and otherwise the same conditions as listed
above. These numbers are useful to identify the correct current
limit to select for a given device and output power requirement.
?
?
?
Standard current limit (I LIMIT ) is selected with a 0.1 μ F BP/M pin
capacitor and is the normal choice for typical enclosed
adapter applications.
When a 1 μ F BP/M pin capacitor is used, the current limit is
reduced (I LIMITred or I LIMIT -1) offering reduced RMS device
currents and therefore improved ef?ciency, but at the expense
of maximum power capability. This is ideal for thermally
challenging designs where dissipation must be minimized.
When a 10 μ F BP/M pin capacitor is used, the current limit is
increased (I LIMITinc or I LIMIT +1), extending the power capability for
applications requiring higher peak power or continuous power
Overvoltage Protection
The output overvoltage protection provided by TinySwitch-III
uses an internal latch that is triggered by a threshold current of
approximately 5.5 mA into the BP/M pin. In addition to an
internal ?lter, the BP/M pin capacitor forms an external ?lter
providing noise immunity from inadvertent triggering. For the
bypass capacitor to be effective as a high frequency ?lter, the
capacitor should be located as close as possible to the
SOURCE and BP/M pins of the device.
Peak Output Power Table
where the thermal conditions allow.
230 VAC ± 15%
85-265 VAC
Further ?exibility comes from the current limits between
Product
I LIMIT -1
I LIMIT
I LIMIT +1
I LIMIT -1
I LIMIT
I LIMIT +1
adjacent TinySwitch-III family members being compatible. The
reduced current limit of a given device is equal to the standard
current limit of the next smaller device and the increased
TNY274P/G
TNY275P/G
8W
10.8 W
10.9 W
12 W
9.1 W
15.1 W
7.1 W
8.4 W
8.5 W
9.3 W
7.1 W
11.8 W
current limit is equal to the standard current limit of the next
TNY276P/G
11.8 W 15.3 W 19.4 W
9.2 W
11.9 W 15.1 W
larger device.
TNY277P/G
15.1 W 19.6 W 23.7 W 11.8 W 15.3 W 18.5 W
Key Application Considerations
TNY278P/G
19.4 W
24 W
28 W
15.1 W 18.6 W 21.8 W
TNY279P/G
23.7 W 28.4 W 32.2 W 18.5 W
22 W
25.2 W
TinySwitch-lll Design Considerations
TNY280P/G
28 W
32.7 W 36.6 W 21.8 W 25.4 W 28.5 W
Output Power Table
The data sheet output power table (Table 1) represents the
Table 2.
Minimum Practical Power at Three Selectable Current Limit Levels.
minimum practical continuous output power level that can be
obtained under the following assumed conditions:
1. The minimum DC input voltage is 100 V or higher for 85 VAC
input, or 220 V or higher for 230 VAC input or 115 VAC with
a voltage doubler. The value of the input capacitance should
be sized to meet these criteria for AC input designs.
2. Ef?ciency of 75%.
3. Minimum data sheet value of I 2 f.
4. Transformer primary inductance tolerance of ±10%.
5. Re?ected output voltage (V OR ) of 135 V.
6. Voltage only output of 12 V with a fast PN recti?er diode.
7. Continuous conduction mode operation with transient K P *
value of 0.25.
www.powerint.com
For best performance of the OVP function, it is recommended
that a relatively high bias winding voltage is used, in the range
of 15 V-30 V. This minimizes the error voltage on the bias
winding due to leakage inductance and also ensures adequate
voltage during no-load operation from which to supply the
BP/M pin for reduced no-load consumption.
Selecting the Zener diode voltage to be approximately 6 V
above the bias winding voltage (28 V for 22 V bias winding)
gives good OVP performance for most designs, but can be
adjusted to compensate for variations in leakage inductance.
Adding additional ?ltering can be achieved by inserting a low
9
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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