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TEA18361T Fiches technique(PDF) 10 Page - NXP Semiconductors |
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TEA18361T Fiches technique(HTML) 10 Page - NXP Semiconductors |
10 / 29 page TEA18361T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 2 — 12 December 2013 10 of 29 NXP Semiconductors TEA18361T GreenChip SMPS control IC [1] When the voltage on the PROTECT pin is between Vth(pd)(PROTECT) and Vdet(PROTECT), the clock of the delay counter is changed from the driver pulse to 1 ms internal pulse. When the system stops switching, the VCC pin is not supplied via the auxiliary winding anymore. Depending on the protection triggered, the VCC is regulated to Vstartup via the HV pin (see Table 3). Releasing the latched protections or shortening the safe restart timer can be achieved by removing or shorting the mains voltage. This is called a fast latch reset. It is mainly used to shorten the test time in production (See Section 7.6.8). 7.6.1 OverPower Protection (OPP) The overpower function is used to realize a maximum output power which is nearly constant over the full input mains. The overpower compensation circuit measures the input voltage via the AUX pin and outputs two reference voltages (see Figure 1). If the measured voltage at the ISENSE pin exceeds the highest reference voltage (Vopc(ISENSE)) the DRIVER output is pulled low. If the measured ISENSE voltage exceeds the lower reference voltage (Vopp(ISENSE)), the OverPower counter starts. Both reference voltages depend on the measured input voltage. In this way the system allows 150 % overpower over the rated power on a cycle-by-cycle base. 100 % overpower triggers the overpower counter of 200 ms. Figure 9 shows the overpower protection curves. Table 3. Protections Protection Delay Action VCC regulated AUX open no wait until AUX is connected no brownout 30 ms wait until Vmains >Vbrownin yes maximum on-time no safe restart 800 ms yes OTP internal no latch yes OTP via the PROTECT pin 2 ms to 4 ms latch yes OVP via the AUX pin 4 driver pulses[1] latch yes overpower compensation no via AUX; cycle-by-cycle - overpower time-out 40 ms or 200 ms safe restart 800 ms yes overpower + UVLO no safe restart 800 ms yes overcurrent protection blanking time cycle-by-cycle no UVLO no Wait until VCC >Vstartup yes |
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