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TEA1533AP 数据表(PDF) 11 Page - NXP Semiconductors |
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TEA1533AP 数据表(HTML) 11 Page - NXP Semiconductors |
11 / 24 page 2002 Aug 23 11 Philips Semiconductors Product specification GreenChipTMII SMPS control IC TEA1533P; TEA1533AP 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.10). 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 subtracted from pin VCC charging current, the RSS value will affect the VCC charging current level by a maximum of 60 µA (typical value). Driver The driver circuit to the gate of the power MOSFET has a current sourcing capability of 170 mA typical and a current sink capability of 700 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.10 Soft start. |
类似零件编号 - TEA1533AP |
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类似说明 - TEA1533AP |
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