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CS5126XD8 Datasheet(PDF) 9 Page - Cherry Semiconductor Corporation |
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CS5126XD8 Datasheet(HTML) 9 Page - Cherry Semiconductor Corporation |
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9 / 10 page  9 be used in synchronized operation, the inductor value should be recalculated to work with the slope compensa- tion ramp reduced to 67% of the normal value. Powering the CS5124/6 from a Transformer Winding There are numerous ways to power the CS5124/6 from a transformer winding to enable the converter to be operated at high efficiency over a wide input range. Two ways are shown in the application circuits. The CS5124 application circuit (main application diagram) is a flyback converter that uses a second flyback winding to power VCC. R4 improves VCC regulation with load changes by snubbing the turn off spike. Once the turn off spike has subsided the voltage of this winding is voltage proportional to the voltage on the main flyback winding. This voltage is regulated because the main winding is clamped by the regulated output voltage. In the CS5126 application circuit (below) an extra winding is added to the forward inductor to power VCC. This wind- ing is phased to conduct during the off time of the forward converter and performs the same function as the flyback winding above. A flyback winding from a forward transformer can also be used to power VCC. Ideally the transformer volt-second product of a forward converter would be constant over the range of line voltages and load currents; and the trans- former inductance could be chosen to store the required level of energy during each cycle to power VCC. Even though the flyback energy is not directly regulated it would remain constant. Unfortunately in a real converter there are many non-ideal effects that degrade regulation. Transformer inductance varies, converter frequency varies, energy stored in primary leakage inductance varies with output current, stray transformer capacitances and various parasitics all effect the level of energy available for VCC. If too little energy is provided to VCC, the bootstrapping cir- cuit must provide power and efficiency will be reduced. If too much energy is provided VCC rises and may damage the controller. If this approach is taken the circuit must be carefully designed and component values must be con- trolled for good regulation. Application Information: continued Additional Application Diagram V CC UVLO SS Gnd GATE IS V FB R4 0.2Ω 1/4W Q2 IRF634 R6 17.4k C2 1.5µF, 100V C3 0.2µF, 100V 10µH 36-75VIN L1 R1 39k R7 2k C12 .01µF C9 .01µF R3 30.1k C7 47µF ISOLATED RTN 5VOUT ENABLE 48VRTN C10 1000pF C11 0.1µF TPS5908 U2 R8 10.0k SYNC C1 1.5µF, 100V SYNC CS5126 R2 200k MMBD6100L D2 C5 1µF, 25V C6 390pF C8 47µF D3 11V R10 10k R9 10k C4 1000pF Q1 F2T493 T1 T2 MBRB2060CT CTX15-14527 CTX15-14526 48V to 5V, 5A forward converter using the CS5126 |
Similar Part No. - CS5126XD8 |
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Similar Description - CS5126XD8 |
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