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TNY266PN Datasheet(PDF) 7 Page - Power Integrations, Inc. |
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TNY266PN Datasheet(HTML) 7 Page - Power Integrations, Inc. |
7 / 22 page Rev. H 02/09 7 TNY263-268 www.powerint.com Figure 14. 2.5 W Constant Voltage, Constant Current Battery Charger with Universal Input (85-265 VAC). PI-2706-021809 + 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 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 single inductor (or two small resistors for under 3 W applications 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 undervoltage 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. 2.5 W CV/CC Cell-Phone Charger As an example, Figure 14 shows a TNY264 based 5 V, 0.5 A, cellular phone charger operating over a universal input range (85 VAC to 265 VAC). The inductor (L1) forms a π-filter in conjunction with C1 and C2. The resistor R1 damps resonances in the inductor L1. Frequency jittering operation of TinySwitch-II allows the use of a simple π-filter described above in combination with a single low value Y1-capacitor (C8) to meet worldwide conducted EMI standards. The addition of a shield winding in the transformer allows conducted EMI to be met even with the output capacitively earthed (which is the worst case condition for EMI). The diode D6, capacitor C3 and resistor R2 comprise the clamp circuit, limiting the leakage inductance turn-off voltage spike on the TinySwitch-II DRAIN pin to a safe value. The output voltage is determined by the sum of the optocoupler U2 LED forward drop (~1 V), and Zener diode VR1 voltage. Resistor R8 maintains a bias current through the Zener diode to ensure it is operated close to the Zener test current. |
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