UBA2015 PHILIPS [NXP Semiconductors], UBA2015 Datasheet - Page 18

• 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
7.4.8 Stop state
7.6.1 End-of-life rectifying lamp detection
7.5 Enable and Disable
7.6 Protection circuits
The amount of boost depends on the current into the BOOST pin and the lamp current
control. If the application does not use lamp current control, the switching frequency will
go down to the lowest possible boost switching frequency f
“Resonance curve application with
Equation
If the application uses lamp current control, the switching frequency is regulated to boost
regulation voltage on pin IFB, V
application with
(depending on the value of I
otherwise the switching frequency is f
When in Stop state the IC is off and all driver outputs are low. The IC will remain in Stop
state until the voltage on pin VDD drops below V
will go to Reset state.
The sequence of events for entering the Stop state are shown in
The enable function is only available in the UBA2015 and UBA2015A and works via pin
PH/EN. If this pin is pulled below the enable voltage V
Standby state (immediately if GLHB is high, otherwise it will continue its normal clock
cycle until GLHB is high and then go to the Standby state).
The external interface with pin PH/EN for the enable signal should be an open collector or
open drain type driver. To enable the IC the open collector or open drain should be open
(high ohmic) to not disturb the fixed frequency preheat setting function of pin PH/EN.
In Restart, Standby and Stop states the standby pull-up current source I
pull the voltage at pin PH/EN above V
normal output voltage driver of the IC will pull the pin high. In those cases the external
driver must draw a current I
If voltage on pin EOL is below low threshold voltage V
fault timer will start. These threshold voltage levels are related to pin FBPFC voltage
according to the formula: V
sampled during GPFC low and hold during GPFC high periods to prevent disturbance of
the EOL levels due to the switching of the PFC.
0
I
0
I
BOOST
BOOST


I
I
BOOST
BOOST


I
I
2, depending on the value of I
sat BOOST
sat BOOST




I
I
sat BOOST
sat BOOST
All information provided in this document is subject to legal disclaimers.


UBA2016A”) that can be calculated by




Rev. 3 — 16 November 2011


f
V

sw bst

reg bst

f
V

th(low)EOL
sw bst
clamp(PH/EN)
reg IFB
BOOST
 low


 IFB


reg(bst)(IFB)
 low


) if the switching frequency remains above f


=
UBA2016A”) that is determined by

I
= V
=

BOOST
f
sw(bst)(low)
sw low
en(PH/EN)
=
V
from the pin to disable the IC.
BOOST
FBPFC

reg IFB
f
sw low
(point F in





=
1 I
.
= V
. In Preheat, Ignition and Burn states the

; see
–

V

+
rst(VDD)
1 I
reg IFB
sat BOOST
th(high)EOL
I
–
sat BOOST
UBA2016A/15/15A


Equation 1
Figure 11 “Resonance curve

BOOST
en(PH/EN)
th(low)EOL

Equation 3

or it is disabled, in which case it
1
600 V fluorescent lamp driver

+
sw(bst)(low)
/ 2. The FBPFC voltage is



I
N
N

BOOST
N
f bst
f bst


then the IC goes into the
or above V
Vreg bst
or
Figure 9 “State
 low
 low

Equation

or


N
(point G in
Equation


l bst

Equation 1



© NXP B.V. 2011. All rights reserved.
pu(stb)(PH/EN)
reg
th(high)EOL
2.

sw(bst)(low)
4,
Figure 11
diagram”.
or
18 of 42
will
the
(1)
(2)
,
(3)
(4)