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TNY285KG-TL Datasheet(PDF) 8 Page - Power Integrations, Inc. |
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TNY285KG-TL Datasheet(HTML) 8 Page - Power Integrations, Inc. |
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8 / 26 page  Rev. A 09/12 8 TNY284-290 www.powerint.com Applications Example The circuit shown in Figure 16 is a low cost, high efficiency, flyback power supply designed for 5 V, 4 A output from universal input using the TNY290PG. The supply features undervoltage lockout, primary sensed output overvoltage latching shutdown protection, high efficiency (>80%), and very low no-load consumption (<50 mW at 265 VAC). Output regulation is accomplished using a simple Zener reference and optocoupler feedback. The rectified and filtered input voltage is applied to the primary winding of T1. The other side of the transformer primary is driven by the integrated MOSFET in U1. Diode D1, C3, R1, and VR1 comprise the clamp circuit, limiting the leakage inductance turn-off voltage spike on the DRAIN pin to a safe value. The output voltage is regulated by TL431 U2. When the output voltage ripple exceeds the sum of the U2 (CATHODE D6) and optocoupler LED forward drop, current will flow in the optocoupler LED. This will cause the transistor of the optocoupler to sink current. When this current exceeds the ENABLE pin threshold current the next switching cycle is inhibited. When the output voltage falls below the feedback threshold, a conduction cycle is allowed to occur and, by adjusting the number of enabled cycles, output regulation is maintained. As the load reduces, the number of enabled cycles decreases, lowering the effective switching frequency and scaling switching losses with load. This provides almost constant efficiency down to very light loads, ideal for meeting energy efficiency requirements. As the TinySwitch-4 devices are completely self-powered, there is no requirement for an auxiliary or bias winding on the transformer. However by adding a bias winding, the output overvoltage protection feature can be configured, protecting the load against open feedback loop faults. When an overvoltage condition occurs, such that bias voltage exceeds the sum of VR2 and the BYPASS/MULTIFUNCTION (BYPASS/MULTI-FUNCTIONAL) pin voltage, current begins to flow into the BYPASS/MULTI-FUNCTIONAL pin. When this current exceeds I SD the internal latching shutdown circuit in TinySwitch-4 is activated. This condition is reset when the ENABLE/UNDERVOLTAGE pin current flowing through R12 and R13 drop below 18.75 μA each AC line half-cycle. The configuration of Figure 16 is therefore non-latching for an overvoltage fault. Latching overvoltage protection can be achieved by connecting R12 and R13 to the positive terminal of C2, at the expense of higher standby consumption. In the example shown, on opening the loop, the OVP trips at an output of 17 V. For lower no-load input power consumption, the bias winding may also be used to supply the TinySwitch-4 device. Resistor Figure 16. TNY290PG, 5 V, 4 A Universal Input Power Supply. D S EN/UV BP/M 90 - 295 VAC 5 V, 4 A RTN PI-6559-062012 R12 2 M Ω R13 2 M Ω R15 1.5 M Ω 1/8 W C9 10 µF 16 V C11 2.2 µF 50 V R14 3.3 k Ω 1/8 W R8 1 k Ω 1/8 W R7 10 k Ω 1% R2 8.2 Ω R3 4.7 Ω 1/2 W R9 47 Ω R4 30 k Ω 1/8 W R6 10 k Ω 1% R1 22 Ω 1/2 W D1 UF4006-E3 D3 1N4937 U2 TL431 VR2 1N5254 27 V VR1 P6KE150A TinySwitch-4 U1 TNY290PG U3 PC817 In a PC standby application input stage will be part of main power supply input D4 STPS30L60CT RT1 6 Ω F1 5 A C3 2.2 nF 1 kV BR1 2KBP10M 1000 V C2 68 µF 450 V C4 100 µF 50 V C8 1000 µF 10 V L1 10 mH L2 2.2 µH C5 1.5 nF 100 V C6, C7 1500 µF 10 V C10 47 nF 100 V C13 2.2 nF 250 VAC 1 9,10 7,8 T1 EE22 4 5 3 C1 100 nF 275 VAC C16 100 nF 100 V |
Similar Part No. - TNY285KG-TL |
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Similar Description - TNY285KG-TL |
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