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TNY290PG-TL 参数 Datasheet PDF下载

TNY290PG-TL图片预览
型号: TNY290PG-TL
PDF下载: 下载PDF文件 查看货源
内容描述: 高能效,离线式开关本着补偿过载功率 [Energy-Efficient, Off-Line Switcher With Line Compensated Overload Power]
分类和应用: 开关
文件页数/大小: 26 页 / 2282 K
品牌: POWERINT [ Power Integrations ]
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TNY284-290  
R4 feeds current into the BYPASS/MULTI-FUNCTIONAL pin,  
inhibiting the internal high-voltage current source that normally  
maintains the BYPASS/MULTI-FUNCTIONAL pin capacitor  
voltage (C7) during the internal MOSFET off-time. This reduces  
the no-load consumption of this design from 140 mW to 40 mW  
at 26ꢀ VAC.  
Function  
TinySwitch-III  
TinySwitch-4  
BVDSS  
700 V  
N/A  
72ꢀ V  
Yes  
Line Compensated OCP  
Typical OCP Change from  
8ꢀ VAC to 26ꢀ VAC  
>405  
<1ꢀ5  
UV Threshold  
2ꢀ μA ±105  
2ꢀ μA ±ꢀ5  
Undervoltage lockout is configured by Rꢀ connected between  
the DC bus and ENABLE/UNDERVOLTAGE pin of U1. When  
present, switching is inhibited until the current in the ENABLE/  
UNDERVOLTAGE pin exceeds 2ꢀ μA. This allows the start-up  
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.  
VBP Reset Voltage  
2.6 V Typical  
3.0 V Typical  
DIP-8C (P),  
eSOP-12B (K),  
SO-8C (D)  
DIP-8C (P),  
SMD-8C (G)  
Packages  
Table 2.  
Comparisons Between TinySwitch-III and TinySwitch-4.  
In addition to the simple input pi filter (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 TNY288, give excellent  
conducted and radiated EMI performance with this design  
achieving >12 dBμV of margin to ENꢀꢀ022 Class B conducted  
EMI limits.  
TinySwitch-4 Design Considerations  
Output Power Table  
The data sheet output power table (Table 1) represents the  
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 8ꢀ VAC  
input, or 220 V or higher for 230 VAC input or 11ꢀ VAC with  
a voltage doubler. The value of the input capacitance should  
be sized to meet these criteria for AC input designs.  
2. Efficiency of 7ꢀ5.  
For design flexibility 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.  
3. Minimum data sheet value of I2f.  
4. Transformer primary inductance tolerance of 105.  
ꢀ. Reflected output voltage (VOR) of 13ꢀ V.  
•ꢀ Standard current limit (ILIMIT) is selected with a 0.1 μF BYPASS/  
MULTI-FUNCTIONAL pin capacitor and is the normal choice  
for typical enclosed adapter applications.  
•ꢀ When a 1 μF BYPASS/MULTI-FUNCTIONAL pin capacitor is  
used, the current limit is reduced (ILIMITred or ILIMIT-1) offering  
reduced RMS device currents and therefore improved  
efficiency, but at the expense of maximum power capability.  
This is ideal for thermally challenging designs where dissipa-  
tion must be minimized.  
•ꢀ When a 10 μF BYPASS/MULTI-FUNCTIONAL pin capacitor is  
used, the current limit is increased (ILIMITinc or ILIMIT+1), extending  
the power capability for applications requiring higher peak  
power or continuous power where the thermal conditions allow.  
6. Voltage only output of 12 V with a fast PN rectifier diode.  
7. Continuous conduction mode operation with transient KP*  
value of 0.2ꢀ.  
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  
sufficient area of copper and/or a heat sink is used to keep  
the SOURCE pin temperature at or below 110 °C.  
10. Ambient temperature of ꢀ0 °C for open frame designs and  
40 °C for sealed adapters.  
*Below a value of 1, KP is the ratio of ripple to peak primary  
current. To prevent reduced power capability due to premature  
termination of switching cycles a transient KP limit of ≥0.2ꢀ is  
recommended. This prevents the initial current limit (IINIT) from  
being exceeded at MOSFET turn-on.  
Further flexibility comes from the current limits between  
adjacent TinySwitch-4 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  
current limit is equal to the standard current limit of the next  
larger device.  
For reference, Table 3 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.  
Key Application Considerations  
TinySwitch-4 vs. TinySwitch-III  
Table 2 compares the features and performance differences  
between TinySwitch-4 and TinySwitch-III. TinySwitch-4 is pin  
compatible to TinySwitch-III with improved features. It requires  
minimum design effort to adapt into a new design. In addition  
to the feature enhancement, TinySwitch-4 offers two new  
packages; eSOP-12B (K) and SO-8C (D) to meet various  
application requirements.  
Overvoltage Protection  
The output overvoltage protection provided by TinySwitch-4  
uses an internal latch that is triggered by a threshold current of  
approximately ꢀ.ꢀ mA into the BYPASS/MULTI-FUNCTIONAL  
pin. In addition to an internal filter, the BYPASS/MULTI-  
FUNCTIONAL pin capacitor forms an external filter providing  
noise immunity from inadvertent triggering. For the bypass  
9
www.powerint.com  
Rev. A 09/12