UBA2015 PHILIPS [NXP Semiconductors], UBA2015 Datasheet - Page 22

• 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
7.6.10 Temperature protection
7.6.11 Fault timer
7.6.6 Coil saturation protection
7.6.7 Lamp overcurrent protection
7.6.8 Lamp overvoltage protection
7.6.9 Lamp removal detection
When the peak voltage on pin SLHB exceeds saturation threshold voltage V
additional current I
Ignition state the fault timer is started and a discharge current I
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
Current I
protection if pin SLHB is left open.
If voltage on pin IFB exceeds the overcurrent detection threshold voltage V
the oscillator is running at f
enter the Stop state.
When the peak voltage on pin VFB exceeds V
discharge current I
switching frequency.
When V
IC will enter the Stop state.
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.
When the temperature is above T
The IC cannot exit the Standby state until the temperature drops below T
Any fault that starts the fault timer must be detected for longer than the fault activation
delay time t
pin CPT is alternately being charged and discharged. After 8 charging and 7 discharging
cycles the fault time-out period t
the Auto-restart state, depending on the fault detected, the current state of the timer and
the number of ignition attempts; see
VFB
bias(SLHB)
d(act)fault
> V
th(ovextra)(VFB)
All information provided in this document is subject to legal disclaimers.
is sourced to pin SLHB which will force the controller into coil saturation
add(CF)
dch(CIFB)
to actually start the timer. When the timer is started, the capacitor at
Rev. 3 — 16 November 2011
is sourced to pin CF to shorten the running oscillator cycle. In
sw(high)
is drawn from pin CIFB during the next cycle to increase the
for longer than the fault activation delay time t
to(fault)
d(det)sat
, an overcurrent is detected and the IC will immediately
th(act)otp
Figure 9 “State
is reached and the IC enters either the Stop state or
.
and GLHB is high, the IC enters Standby state.
th(ov)(VFB)
UBA2016A/15/15A
diagram”. If the fault that started the
, the fault timer is started and a
600 V fluorescent lamp driver
dch(CIFB)
is drawn from pin
© NXP B.V. 2011. All rights reserved.
th(rel)otp
det(fault)
th(ocd)(IFB)
th(sat)SLHB
.
then the
22 of 42
, and
, an