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TEA1716T データシート(PDF) 8 Page - NXP Semiconductors |
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TEA1716T データシート(HTML) 8 Page - NXP Semiconductors |
8 / 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 8 of 47 NXP Semiconductors TEA1716T Resonant power supply control IC with PFC • Boost charge state The PFC controller is switching; the HBC controller is off. The current from the high-voltage start-up source is large enough to supply the SUPIC pin (current consumption < Ich(nom)(SUPIC)). • Operational supply state Both the PFC and HBC controllers are switching. Current consumption is Ioper(SUPIC). When the HBC controller is enabled, the switching frequency is high initially and the HBC MOSFET drivers current consumption is dominant. The stored energy in CSUPIC supplies the initial SUPIC current before the SUPIC supply source takes over. • Burst stop mode Only a small section of the IC is active while CSUPREG is kept charged and the sensing of the SNSBURST input is active. The PFC and HBC controllers are stopped. Current consumption is limited to Iburstm(SUPIC). The SUPIC pin has a low short circuit detection voltage (Vscp(SUPIC) = 0.65 V). The current dissipated in the HV start-up source is limited while VSUPIC < Vscp(SUPIC) (see Section 7.2.4). 7.2.2 Regulated supply (SUPREG pin) The voltage range on the SUPIC pin exceeds that of the external MOSFETs gate voltages. The TEA1716T contains an integrated series stabilizer. The series stabilizer creates an accurate regulated voltage (Vreg(SUPREG) = 11.3 V) at the buffer capacitor CSUPREG. This stabilized voltage is used to: • Supply the internal PFC driver • Supply the internal low-side HBC driver • Supply the internal high-side driver using external components • As a reference voltage for optional external circuits The SUPREG series stabilizer is enabled after CSUPIC has been fully charged. Enabling the stabilizer after charging ensures that any optional external circuitry connected to SUPREG does not dissipate any of the start-up current. To ensure that the external MOSFETs receive sufficient gate drive current, the voltage on the SUPREG pin must reach Vstart(SUPREG). In addition, the voltage on the SUPIC pin must reach the start level. The IC starts operating when both voltages reach their start levels. SUPREG is provided with undervoltage protection (UVP-SUPREG; see Section 7.9). When VSUPREG <Vuvp(SUPREG) (10 V), two events are triggered: • The IC stops operating to prevent unreliable switching because the gate driver voltage is too low. The PFC controller stops switching immediately, but the HBC controller continues until the low-side stroke is active. • The maximum current from the internal SUPREG series stabilizer is reduced to Ich(red)(SUPREG) (5.4 mA). This feature reduces the dissipation in the series stabilizer when an overload occurs at the SUPREG pin while the SUPIC pin is supplied from an external DC supply. |
同様の部品番号 - TEA1716T |
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同様の説明 - TEA1716T |
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