Electronic Components Datasheet Search |
|
TNY263GN Datasheet(PDF) 7 Page - Power Integrations, Inc. |
|
TNY263GN Datasheet(HTML) 7 Page - Power Integrations, Inc. |
7 / 24 page 7 TNY263-268 G 4/05 Figure 14. 2.5 W Constant Voltage, Constant Current Battery Charger with Universal Input (85-265 VAC). PI-2706-080404 + 5 V 500 mA RTN D1 1N4005 C1 3.3 µF 400 V Fusible RF1 8.2 Ω C3 0.1 µF C7 10 µF 10 V 85-265 VAC L1 2.2 mH D2 1N4005 D3 1N4005 D4 1N4005 R2 200 k Ω U2 LTV817 D5 1N5819 Shield L2 3.3 µH C5 330 µF 16 V C2 3.3 µF 400 V C6 100 µF 35 V R7 100 Ω R4 1.2 Ω 1/2 W Q1 2N3904 R8 270 Ω VR1 BZX79- B3V9 3.9 V U1 TNY264 C3 2.2 nF D6 1N4937 R6 1 Ω 1/2 W T1 R1 1.2 k Ω 1 8 4 5 R3 22 Ω R9 47 Ω C8 680 pF Y1 Safety TinySwitch-II D S BP EN/UV The TinySwitch-II does not require a bias winding to provide power to the chip, because it draws the power directly from the DRAIN pin (see Functional Description above). This has two main benefits. First, for a nominal application, this eliminatesthecostofabiaswindingandassociatedcomponents. Secondly, for battery charger applications, the current-voltage characteristic often allows the output voltage to fall close to zero volts while still delivering power. This type of application normally requires a forward-bias winding which has many more associated components. With TinySwitch-II, neither are necessary.Forapplicationsthatrequireaverylowno-loadpower consumption (50 mW), a resistor from a bias winding to the BYPASS pin can provide the power to the chip. The minimum recommended current supplied is 750 µA. The BYPASS pin in thiscasewillbeclampedat6.3V.Thismethodwilleliminatethe power draw from the DRAIN pin, thereby reducing the no-load power consumption and improving full-load efficiency. Current Limit Operation Each switching cycle is terminated when the DRAIN current reaches the current limit of the TinySwitch-II. Current limit operation provides good line ripple rejection and relatively constant power delivery independent of input voltage. BYPASS Pin Capacitor The BYPASS pin uses a small 0.1 µF ceramic capacitor for decoupling the internal power supply of the TinySwitch-II. Application Examples The TinySwitch-II is ideal for low cost, high efficiency power supplies in a wide range of applications such as cellular phone chargers, PC standby, TV standby,AC adapters, motor control, appliance control and ISDN or a DSL network termination. The 132 kHz operation allows the use of a low cost EE13 or EF12.6 core transformer while still providing good efficiency. The frequency jitter in TinySwitch-II makes it possible to use a singleinductor(ortwosmallresistorsforunder3Wapplications if lower efficiency is acceptable) in conjunction with two input capacitors for input EMI filtering. The auto-restart function removes the need to oversize the output diode for short circuit conditions allowing the design to be optimized for low cost and maximum efficiency. In charger applications, it eliminates the need for a second optocoupler and Zener diode for open loop fault protection.Auto-restart also saves the cost of adding a fuse or increasing the power rating of the current sense resistors to survive reverse battery conditions. For applications requiring under-voltage lock out (UVLO), such as PC standby, the TinySwitch-II eliminates several components and saves cost. TinySwitch-II is well suited for applications that require constant voltage and constant current output. As TinySwitch-II is always powered from the input high voltage, it therefore does not rely on bias winding voltage. Consequently this greatly simplifies designing chargers that must work down to zero volts on the output. |
Similar Part No. - TNY263GN |
|
Similar Description - TNY263GN |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |