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TEA1713T Datasheet(PDF) 8 Page - NXP Semiconductors |
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TEA1713T Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 47 page TEA1713T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 2 — 9 February 2011 8 of 47 NXP Semiconductors TEA1713T Resonant power supply control IC with PFC external diode DSUPHS. The voltage drop between SUPREG and SUPHS can be minimized by carefully selecting the appropriate diode, especially when using large MOSFETs and high switching frequencies. 7.2.4 High voltage supply input (pin SUPHV) In a stand-alone power supply application, this pin is connected to the boost voltage. CSUPIC and CSUPREG will be charged by the HV start-up source (which delivers a constant current from SUPHV to SUPIC) via this pin. Short-circuit protection on pin SUPIC (SCP-SUPIC; see Section 7.9) limits the dissipation in the HV start-up source when SUPIC is shorted to ground and limits the current on SUPHV (to Ired(SUPHV)) as long as the voltage on SUPIC is below Vscp(SUPIC). Under normal operating conditions, the voltage on pin SUPIC will exceed Vscp(SUPIC) very quickly after start-up and the HV start-up source will switch to the nominal current Inom(SUPHV). During start-up and restart, the HV start-up source will charge CSUPIC and regulate the voltage on SUPIC by hysteretic control. So the start level has a small degree of hysteresis Vstart(hys)(SUPIC). The HV start-up source switches-off when VSUPIC exceeds the start level Vstart(hvd)(SUPIC). Current consumption through pin SUPHV will be low (Itko(SUPHV)). Once start-up is complete and the HBC controller is operating, SUPIC can be supplied from the auxiliary winding of the HBC transformer. In this operational state, the HV start-up source is disabled. 7.3 Flow diagram The operation of the TEA1713 can be divided into a number of states - see Figure 3. The abbreviations used in Figure 3 are explained In Table 8. |
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