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UBA2015TN1 Datasheet(PDF) 8 Page - NXP Semiconductors |
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UBA2015TN1 Datasheet(HTML) 8 Page - NXP Semiconductors |
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8 / 42 page  UBA2016A_15_15A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Objective data sheet Rev. 1 — 20 May 2011 8 of 42 NXP Semiconductors UBA2016A/15/15A 600 V fluorescent lamp driver 7.2.2 Protection The PFC incorporates the following protection mechanisms: • When voltage on pin FBPFC drops below open/short protection threshold voltage Vth(osp)(FBPFC), the gate is turned off and the start of a new cycle is inhibited. A small internal filter prevents this protection reacting to a negative spike. • When pin FBPFC is left open, a pull-down bias current Ibias(FBPFC) ensures that the pin voltage drops below Vth(osp)(FBPFC). • When voltage at pin FBPFC rises above overvoltage threshold voltage Vth(ov)(FBPFC) the gate immediately turns off. A new cycle will not start while VFBPFC remains above Vth(ov)(FBPFC). This limits the PFC output voltage. This protection is disabled during the leading edge blanking time tleb(FBPFC) after GPFC goes high. • When the toff(PFC)low timer sequence has ended with no demagnetization detected (VAUXPFC has not risen above Vdet(demag)) the on-time of the next cycle will be the no demagnetization detected PFC on-time ton(PFC)nodemag to prevent excessive current build up in the coil. • Bias current Ibias(AUXPFC) ensures that pin AUXPFC is HIGH when not connected ensuring pin GPFC stays LOW. 7.3 Half-bridge driver The IC incorporates drivers for the half-bridge switches and all related circuits such as non-overlap, high voltage level shifter, bootstrap circuit for the floating supply and hard switching and capacitive mode detection. The UBA2016A/15/15A is designed to drive a half-bridge inverter with an inductive load. The load consists typically of an inductor with a resonant capacitor and a TL or CFL. A basic half-bridge application circuit driving a TL is shown in Figure 7 which also shows a typical IC supply configuration with a start-up bleeder resistor and a dV/dt supply. Fig 7. Basic half-bridge and IC supply connection diagram VBUS UBA2016A UBA2015 UBA2015A VDD GND GHHB SHHB FSHB GLHB 001aam534 |
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