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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 22 of 42
NXP Semiconductors
UBA2016A/15/15A
600 V fluorescent lamp driver
7.6.6 Coil saturation protection
When the peak voltage on pin SLHB exceeds saturation threshold voltage V
th(sat)SLHB
, an
additional current I
add(CF)
is sourced to pin CF to shorten the running oscillator cycle. In
Ignition state the fault timer is started and a discharge current I
dch(CIFB)
is drawn from pin
CIFB during the next cycle to increase the switching frequency.
In Burn state the IC will go to Stop state if coil saturation is detected longer than the
saturation detection delay time t
d(det)sat
.
Current I
bias(SLHB)
is sourced to pin SLHB which will force the controller into coil saturation
protection if pin SLHB is left open.
7.6.7 Lamp overcurrent protection
If voltage on pin IFB exceeds the overcurrent detection threshold voltage V
th(ocd)(IFB)
, and
the oscillator is running at f
sw(high)
, an overcurrent is detected and the IC will immediately
enter the Stop state.
7.6.8 Lamp overvoltage protection
When the peak voltage on pin VFB exceeds V
th(ov)(VFB)
, the fault timer is started and a
discharge current I
dch(CIFB)
is drawn from pin CIFB during the next cycle to increase the
switching frequency.
When V
VFB
>V
th(ovextra)(VFB)
for longer than the fault activation delay time t
det(fault)
then the
IC will enter the Stop state.
7.6.9 Lamp removal detection
Removing the lamp from applications that have the resonant capacitor connected via the
lamp filaments, will result in hard switching because current cannot flow through the
ballast inductor.
If hard switching is detected during Ignition or Burn state the fault timer will be started.
For applications with the resonant capacitor connected directly to the ballast inductor,
capacitive mode, coil saturation or over voltage will be detected. Capacitive mode is
activated if the switching frequency ends up below the resonance frequency due to
removal of the lamp. If the switching frequency is near or above the resonance frequency,
the lamp (or rather the lamp socket) voltage and half-bridge current will be very high due
to the unloaded resonant circuit (lamp inductor and lamp capacitor) which activates the
coil saturation protection or the overvoltage protection.
7.6.10 Temperature protection
When the temperature is above T
th(act)otp
and GLHB is high, the IC enters Standby state.
The IC cannot exit the Standby state until the temperature drops below T
th(rel)otp
.
7.6.11 Fault timer
Any fault that starts the fault timer must be detected for longer than the fault activation
delay time t
d(act)fault
to actually start the timer. When the timer is started, the capacitor at
pin CPT is alternately being charged and discharged. After 8 charging and 7 discharging
cycles the fault time-out period t
to(fault)
is reached and the IC enters either the Stop state or
the Auto-restart state, depending on the fault detected, the current state of the timer and
the number of ignition attempts; see Figure 9 “
State diagram”. If the fault that started the
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 23 of 42
NXP Semiconductors
UBA2016A/15/15A
600 V fluorescent lamp driver
timer is no longer detected for a period longer than the fault release delay time t
d(rel)fault
,
the fault timer will be reset and at any new occurance of the fault, the timer will start from
zero.
Faults which activate the fault timer are shown as SlowFault in Figure 9 “
State diagram”.
The fault timer uses the same pin (CPT) to set the time with an external capacitor C
ext(CPT)
as the preheat timer. The ratio between the preheat time-out time t
to(ph)
and the fault
time-out time t
to(fault)
can be changed by adding an external series resistor R
s(ext)(CPT)
or
an external parallel resistor R
p(ext)(CPT)
to the external capacitor C
ext(CPT)
; see Figure 15
“CPT connections”.
The fault timer incorporates a protection that ensures safe operation conditions if the CPT
pin voltage is below V
th(scp)(CPT)
(shorted to GND) by holding the oscillation frequency at
f
sw(high)
.
7.6.12 Brownout protection
Brownout protection is designed to maintain stable and safe lamp operation during dips in
mains supply. Without this protection the current demand from the bus voltage to maintain
constant lamp power would increase upon a drop in bus voltage. This creates an unstable
situation with the mains input voltage dropping and the PFC reaching its regulation range
limit.
Brownout protection reduces the lamp power when the PFC is out of regulation. This
situation is only allowed for a limited time to prevent excessive component stress.
When the PFC is outside its regulation range and the bus voltage is still too low
(V
COMPPFC
=V
clamp(COMPPFC)
and V
FBPFC
<V
reg(FBPFC)
), a brownout current I
bo(CF)
is
added to the charge current at pin CF, thus increasing the f
sw(low)
. A discharge brownout
current I
dch(bo)(CIFB)
is also drawn from pin CIFB. Both I
bo(CF)
and I
dch(bo)(CIFB)
are
proportional to the difference between V
FBPFC
and V
reg(FBPFC)
. If V
FBPFC
<V
th(bo)(FBPFC)
the fault timer will start.
The start-up bleeder resistor and the regulation range of the PFC should be dimensioned
in such a way that if the fault timer times out on brownout protection and the IC enters
Stop state, the input mains voltage is too low to support the standby current of the IC via
the bleeder resistor. The IC will then automatically reset and start-up in normal mode (and
reignite the lamps) when the mains voltage has returned to normal.
Fig 15. CPT connections
001aan210
C
ext(CPT)
R
p(ext)(CPT)
R
s(ext)(CPT)
CPT
C
ext(CPT)
CPT
C
ext(CPT)
CPT
smaller ratio default ratio larger ratio
t
to(ph)
/t
to(fault)
t
to(ph)
/t
to(fault)
t
to(ph)
/t
to(fault)
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 24 of 42
NXP Semiconductors
UBA2016A/15/15A
600 V fluorescent lamp driver
8. Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). All voltages referenced to signal ground (GND
pin 15); current flow into the IC is positive.
Symbol Parameter Conditions Min Max Unit
General
R
ref(IREF)
reference resistance on
pin IREF
30 36 k
SR slew rate pins FSHB, GHHB and SHHB 4+4V/ns
T
amb
ambient temperature 40 +125 C
T
j
junction temperature 40 +150 C
T
stg
storage temperature 55 +150 C
Voltage
V
FSHB
voltage on pin FSHB continuous 0 570 V
t<0.5s 0 630 V
with respect to V
SHHB
0.3 +14 V
V
GHHB
voltage on pin GHHB with respect to V
SHHB
0.3 +14 V
V
GLHB
voltage on pin GLHB 0.3 +14 V
V
GPFC
voltage on pin GPFC 0.3 +14 V
V
VDD
voltage on pin VDD 0.3 +14 V
V
AUXPFC
voltage on pin AUXPFC 9+9V
V
EOL
voltage on pin EOL 9+9V
V
SLHB
voltage on pin SLHB 9+9V
V
IFB
voltage on pin IFB 5+5V
V
DIM
voltage on pin DIM 0.1 +5 V
V
FBPFC
voltage on pin FBPFC 0.1 +5 V
V
BOOST
voltage on pin BOOST 0.3 +2.2 V
V
PH/EN
voltage on pin PH/EN 0.1 +5 V
V
VFB
voltage on pin VFB 0.1 +5 V
Current
I
VDD
current on pin VDD - 50 mA
I
EOL
current on pin EOL 1+1mA
I
SLHB
current on pin SLHB 1+1mA
I
BOOST
current on pin BOOST 50 +50 A
I
AUXPFC
current on pin AUXPFC 1+1mA
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UBA2015T/1,118

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Manufacturer:
NXP Semiconductors
Description:
Display Drivers & Controllers 600V 0.16mA SO20
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