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TEA1506AT Datasheet(PDF) 11 Page - NXP Semiconductors |
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TEA1506AT Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 22 page  2003 Sep 09 11 Philips Semiconductors Product specification GreenChip ™II SMPS control IC TEA1506P; TEA1506AP; TEA1506T; TEA1506AT Control pin protection If pin CTRL is open-circuit or not connected, a fault condition is assumed and the converter will stop switching. Operation will recommence as soon as the fault condition is removed. Soft start-up To prevent transformer rattle during hiccup, the transformer peak current is slowly increased by the soft start function. This can be achieved by inserting a resistor and a capacitor between pin Isense and the sense resistor (see Fig.11). An internal current source charges the capacitor to V = ISS × RSS, with a maximum of approximately 0.5 V. The start level and the time constant of the increasing primary current level can be adjusted externally by changing the values of RSS and CSS. The charging current ISS will flow as long as the voltage on pin Isense is below approximately 0.5 V. If the voltage on pin Isense exceeds 0.5 V, the soft start current source will start limiting the current ISS. At the VCC(start) level, the ISS current source is completely switched off. Since the soft start current ISS is supplied from pin DRAIN, the RSS value will not affect the VCC current during start-up. Driver The driver circuit to the gate of the power MOSFET has a current sourcing capability of 135 mA typical and a current sink capability of 560 mA typical. This permits fast turn-on and turn-off of the power MOSFET for efficient operation. A low driver source current has been chosen to limit the ∆V/∆t at switch-on. This reduces Electro Magnetic Interference (EMI) and also limits the current spikes across Rsense. I primary(max) V ocp I SS R SS × () – R sense ----------------------------------------------- = τ R SS C SS × = handbook, halfpage CSS RSS Isense Rsense ISS Vocp start-up MGU237 5 0.5 V Fig.11 Soft start. |
Similar Part No. - TEA1506AT |
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Similar Description - TEA1506AT |
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