UBA2015 PHILIPS [NXP Semiconductors], UBA2015 Datasheet - Page 9

• Manufacturer Part Number: UBA2015
• Description: 600 V fluorescent lamp driver with PFC, linear dimming and boost function
• Manufacturer: PHILIPS [NXP Semiconductors]

NXP Semiconductors
UBA2016A_15_15A
Product data sheet
7.3.1 VDD supply
7.3.2 Low- and high-side drivers
7.3.3 Non-overlap
The UBA2016A/15/15A is intended to be supplied by a start-up bleeder resistor
connected between the bus voltage V
half-bridge point at pin SHHB.
The IC starts up when the voltage at pin VDD rises above start-up voltage V
locks out (stops oscillating) when the voltage at pin VDD drops below stop voltage
V
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 V
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
I
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.
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
t
(assuming the load always has an inductive behavior), and enabling zero voltage
switching; see
clamp(VDD)
no
stop(VDD)
to allow the half-bridge point to be charged or discharged by the load current
. The hysteresis between the start and stop levels allows the IC to be supplied
.
Figure
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 16 November 2011
8.
BUS
and VDD and a dV/dt supply from the
clamp(VDD)
UBA2016A/15/15A
600 V fluorescent lamp driver
. No external Zener diode is
© NXP B.V. 2011. All rights reserved.
startup(VDD)
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and