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TEA1716T Datasheet(PDF) 7 Page - NXP Semiconductors |
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TEA1716T Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 47 page  TEA1716T All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 3 — 30 November 2012 7 of 47 NXP Semiconductors TEA1716T Resonant power supply control IC with PFC 7.2 Power supply The TEA1716T contains several supply-related pins SUPIC, SUPREG, SUPHS and SUPHV. These pins are described in Section 7.2.1 to Section 7.2.4. 7.2.1 Low-voltage supply input (SUPIC pin) The SUPIC pin is the main low-voltage supply input to the IC. All internal circuits are supplied from this pin directly or indirectly using the SUPREG pin. The high-voltage circuit, however, is not supplied from the SUPIC pin. The SUPIC pin is connected externally to a buffer capacitor CSUPIC. This buffer capacitor can be charged in several ways: • from the internal high-voltage start-up source • from the HBC transformer auxiliary winding • from the e switching half-bridge node capacitive supply • from an external DC supply, for example, a standby supply The IC starts operating when the voltage on the SUPIC pin reaches the start level, provided the voltage on the SUPREG pin has also reached the start level. The start level depends on the condition of the SUPHV pin: • High voltage present on the SUPHV pin (VSUPHV >Vdet(SUPHV)). In a stand-alone application this is the case because CSUPIC is initially charged from the HV start-up source. The start level is Vstart(hvd)(SUPIC) (20 V). The wide difference between the start and stop (Vuvp(SUPIC)) levels allows sufficient energy to be drawn from the SUPIC buffer capacitor until the output voltage stabilizes. • Not connected or no voltage present at SUPHV (VSUPHV <Vdet(SUPHV)). When the TEA1716T is supplied from an external DC source, this is the case. The start level is Vstart(nohvd)(SUPIC) (15 V). The IC is supplied from the DC supply during start-up. To minimize power dissipation the DC supply to the SUPIC pin must be higher than, but close to Vuvp(SUPIC) (13 V). The IC stops operating when VSUPIC <Vuvp(SUPIC). Vuvp(SUPIC). This voltage is the SUPIC pin UnderVoltage Protection (UVP) voltage (UVP-SUPIC; see Section 7.9). The PFC controller stops switching immediately but the HBC controller continues operating until the low-side MOSFET is active. The current consumption depends on the state of the IC. The TEA1716T operating states are described in Section 7.3. • Disabled IC state When the IC is disabled using the SSHBC/EN pin, the current consumption (Idism(SUPIC)) is very low. • SUPIC charge, SUPREG charge, Thermal hold, Restart and Protection shutdown states Only a small section of the IC is active while CSUPIC and CSUPREG are charging during a restart sequence before start-up or during shutdown after a protection function has been activated. The PFC and HBC controllers are disabled. Current consumption is limited to Iprotm(SUPIC). |
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