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UBA2015T/N1 View Datasheet(PDF) - NXP Semiconductors.

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UBA2015T/N1 Datasheet PDF : 42 Pages
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NXP Semiconductors
UBA2016A/15/15A
600 V fluorescent lamp driver
7.3.1 VDD supply
The UBA2016A/15/15A is intended to be supplied by a start-up bleeder resistor
connected between the bus voltage VBUS and VDD and a dV/dt supply from the
half-bridge point at pin SHHB.
The IC starts up when the voltage at pin VDD rises above start-up voltage Vstartup(VDD) and
locks out (stops oscillating) when the voltage at pin VDD drops below stop voltage
Vstop(VDD). The hysteresis between the start and stop levels allows the IC to be supplied
by a buffer capacitor until the dV/dt supply is settled. The UBA2016A/15/15A has an
internal VDD clamp. This is an internal active Zener (or shunt regulator) that limits the
voltage on the VDD supply pin to clamp voltage Vclamp(VDD). No external Zener diode is
needed in the dV/dt supply circuit if the maximum current of the dV/dt supply minus the
current consumption of the IC (mainly determined by the gate drivers’ load) is below
Iclamp(VDD).
7.3.2 Low- and high-side drivers
The low- and high-side drivers are identical. The output of each driver is connected to the
equivalent gate of an external power MOSFET. The high-side driver is supplied by the
bootstrap capacitor, which is charged from the VDD supply voltage via an internal diode
when the low-side power MOSFET is on. The low-side driver is directly supplied by the
VDD supply voltage.
7.3.3 Non-overlap
During each transition between the two states GLHB HIGH/GHHB LOW and
GLHB LOW/GHHB HIGH, GLHB and GHHB will both be LOW for a fixed non-overlap time
tno to allow the half-bridge point to be charged or discharged by the load current
(assuming the load always has an inductive behavior), and enabling zero voltage
switching; see Figure 8.
UBA2016A_15_15A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 16 November 2011
© NXP B.V. 2011. All rights reserved.
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