UBA2017P/1,112 NXP Semiconductors, UBA2017P/1,112 Datasheet - Page 16

• Manufacturer Part Number: UBA2017P/1,112
• Description: Display Drivers & Controllers SMPS CTRLR 12.4V
• Manufacturer: NXP Semiconductors

Specifications of UBA2017P/1,112

• Rohs: yes
• Operating Supply Voltage: 12.4 V
• Mounting Style: Through Hole
• Package / Case: DIP-16
• Maximum Output Current: 105 mA
• Product: Fluorescent Lamp Driver
• Factory Pack Quantity: 25
• Supply Current: 2.2 mA

NXP Semiconductors
UBA2017
Product data sheet
7.5.10 Fault timer
7.5.5 Coil saturation protection
7.5.6 Lamp overcurrent protection
7.5.7 Lamp overvoltage protection
7.5.8 Lamp removal detection
7.5.9 Temperature protection
When the peak voltage on pin SLHB exceeds saturation threshold voltage V
additional current I
the Ignition state, the fault timer is started and a discharge current I
pin CIFB during the next cycle to increase the switching frequency.
In the Burn state, the IC will go to the 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 the 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
state. 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
alternately being charged and discharged. After 8 charging and 7 discharging cycles the
fault time-out period t
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 start the timer. When the timer is started, the capacitor at pin CPT is
to(fault)
Rev. 2 — 15 May 2012
is sourced to pin CF to shorten the running oscillator cycle. In
600 V fluorescent lamp driver with linear dimming function
sw(high)
is drawn from pin CIFB during the next cycle to increase the
is reached and the IC enters either the Stop state or the
for longer than the fault activation delay time t
Figure 6 “State
, an overcurrent is detected and the IC will immediately
th(act)otp
d(det)sat
and GLHB is high, the IC enters the Standby
.
UBA2017/UBA2017A
th(ov)(VFB)
diagram”.
, the fault timer is started and a
dch(CIFB)
© NXP B.V. 2012. All rights reserved.
det(fault)
th(ocd)(IFB)
is drawn from
th(sat)SLHB
th(rel)otp
then the
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, and
, an
.