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UBA2015T/1,118

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42
UBA2016A_15_15A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 3 — 16 November 2011 16 of 42
NXP Semiconductors
UBA2016A/15/15A
600 V fluorescent lamp driver
The output of the OTA is connected to pin CIFB. The external capacitor C
ext(CIFB)
is
charged and discharged according to the voltage on the OTA inputs and the
transconductance of the OTA, g
m(IFB)
according to the formula:
I
CIFB
=g
m(IFB)
(V
IFB
V
reg(IFB
).
More components can be connected to pin CIFB to improve the response time and
stability of the lamp current control loop.
Pin CIFB is connected to the input of the VCO (Voltage Controlled Oscillator) that
determines the frequency of the IC. Pin CIFB voltage is inversely proportional to the
switching frequency. When the load is inductive, an increase in frequency decreases the
lamp current, and a decrease in frequency increases the lamp current. With the closed
loop for the lamp current in place, the IC will regulate to the required frequency for the
desired lamp current. So when the IC enters Burn state it will go to either point D or H
shown in Figure 10
(UBA2015A) or Figure 11 (UBA2016A) depending on the DIM input
voltage.
Fig 12. Lamp current control
R
ext(IFB)
R
i(IFB)
C
ext(CF)
I
ch(low)(CF)
clock
V
high(CF)
I
bias(DIM)
V
reg(ref)
DOUBLE SIDE
RECTIFIER
OTA
VOLTAGE
CONTROLLED
OSCILLATOR
VOLTAGE
CONTROLLED
CURRENT SOURCE
VDD
VDD
VDD
C
ext(CIFB)
CIFB
g
m(IFB)
VDD
CF
IFB
I
lamp
BOOST
grey circuit parts are not present in some types
I
BOOST
VDD
÷ 2
DIM
1 3.5
1 1 7.8
001aan205
UBA2016A_15_15A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 3 — 16 November 2011 17 of 42
NXP Semiconductors
UBA2016A/15/15A
600 V fluorescent lamp driver
However, the switching frequency can never go below f
sw(low)
(unless for UBA2016A when
the boost function is active, see Section 7.4.7.3
). If the regulation level is not reached at
f
sw(low)
the IC will stay at f
sw(low)
(point E in Figure 10 and Figure 11).
7.4.7.2 Operation without lamp current control
To operate the lamp without current control the lamp current sense pin IFB must be
connected to ground. The lamp now operates at the lowest frequency f
sw(low)
(point E in
Figure 10
or Figure 11). Dimming is not supported in this case.
7.4.7.3 Boost
The boost feature is available only in the UBA2016A to support shorter run up times. The
boost function changes the half-bridge switching frequency by lowering the lowest
possible switching frequency from f
sw(low)
to f
sw(bst)(low)
and increasing the lamp current set
point V
reg(IFB)
by adding a multiple of the boost current to the OTA output current which
translates to an extra voltage being added to V
reg(ref)
. During boost time, the frequency is
lowered, and as a consequence of the inductive load the lamp current is increased.
The implementation of the boost function is shown in Figure 12 “
Lamp current control”.
The boost input is a current input with an input range of 0 to I
sat(BOOST)
. The input current
is internally clamped at I
sat(BOOST)
. If the input current at the pin is above I
sat(BOOST)
the
effect will not become bigger. The voltage on the pin is determined by the voltage drop
across the internal current mirror input and limited by an internal clamp circuit if the input
current at the pin rises above I
sat(BOOST)
. For maximum current allowed into the pin; see
Table 4
. An example of how boost function can be implemented is shown in Figure 13.
The boost current is determined by resistor R
BOOST
. R
bias
provides a small threshold for
the boost function and with capacitor C
BOOST
keeps the BOOST pin at a defined (inactive)
level (0 V) during normal lamp operation (after the boost period). The boost time constant
is reflected by the sum of capacitors C
hv
and C
BOOST
and R
BOOST
. Resistor R
hv
and
capacitor C
BOOST
filter out the ripple on V
o(PFC)
.
An example of component values for V
o(PFC)
=430V is:
R
hv
=22M (500 V); C
hv
= 100 nF (500 V); D
reset
= 1N4148; C
BOOST
= 150 nF (63 V);
R
BOOST
=10M and R
bias
=10M
Fig 13. Boost application example; UBA2016A
001aam539
D
reset
C
boost
C
BUS
V
o(PFC)
C
hv
BOOST
R
BOOST
R
hv
R
bias
UBA2016A
UBA2016A_15_15A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 3 — 16 November 2011 18 of 42
NXP Semiconductors
UBA2016A/15/15A
600 V fluorescent lamp driver
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
sw(bst)(low)
(point G in Figure 11
“Resonance curve application with UBA2016A”) that is determined by Equation 1 or
Equation 2
, depending on the value of I
BOOST
.
(1)
(2)
If the application uses lamp current control, the switching frequency is regulated to boost
regulation voltage on pin IFB, V
reg(bst)(IFB)
(point F in Figure 11 “Resonance curve
application with UBA2016A”) that can be calculated by Equation 3 or Equation 4,
(depending on the value of I
BOOST
) if the switching frequency remains above f
sw(bst)(low)
,
otherwise the switching frequency is f
sw(bst)(low)
; see Equation 1 or Equation 2.
(3)
(4)
7.4.8 Stop state
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
rst(VDD)
or it is disabled, in which case it
will go to Reset state.
The sequence of events for entering the Stop state are shown in Figure 9 “
State diagram”.
7.5 Enable and Disable
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
en(PH/EN)
then the IC goes into the
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
pu(stb)(PH/EN)
will
pull the voltage at pin PH/EN above V
en(PH/EN)
. In Preheat, Ignition and Burn states the
normal output voltage driver of the IC will pull the pin high. In those cases the external
driver must draw a current I
clamp(PH/EN)
from the pin to disable the IC.
7.6 Protection circuits
7.6.1 End-of-life rectifying lamp detection
If voltage on pin EOL is below low threshold voltage V
th(low)EOL
or above V
th(high)EOL
the
fault timer will start. These threshold voltage levels are related to pin FBPFC voltage
according to the formula: V
th(low)EOL
=V
FBPFC
=V
th(high)EOL
/ 2. The FBPFC voltage is
sampled during GPFC low and hold during GPFC high periods to prevent disturbance of
the EOL levels due to the switching of the PFC.
0I
BOOST
I
sat BOOST
f
sw bstlow
 f
sw low
1I
BOOST
– N
fbstlow
=
I
BOOST
I
sat BOOST
f
sw bstlow
f
sw low
1I
sat BOOST
– N
fbstlow
=
0I
BOOST
I
sat BOOST
V
reg IFB
 I
BOOST
V
reg IFB
1I
BOOST
+ N
lbstreg
=
I
BOOST
I
sat BOOST
V
reg bstIFB
V
reg IFB
I
sat BOOST
N
Vreg bst
+=
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UBA2015T/1,118

Mfr. #:
Buy UBA2015T/1,118
Manufacturer:
NXP Semiconductors
Description:
Display Drivers & Controllers 600V 0.16mA SO20
Lifecycle:
New from this manufacturer.
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