UBA2017P/1,112 NXP Semiconductors, UBA2017P/1,112 Datasheet - Page 10
![no-image](/images/manufacturer_photos/0/4/487/nxp_semiconductors_sml.jpg)
UBA2017P/1,112
Manufacturer Part Number
UBA2017P/1,112
Description
Display Drivers & Controllers SMPS CTRLR 12.4V
Manufacturer
NXP Semiconductors
Datasheet
1.UBA2017AP1112.pdf
(29 pages)
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
7.3.5 Ignition
The preheat frequency can also be regulated via pin PH/EN. During preheat, the output
voltage of pin PH/EN is V
connected to this pin sinks is compared to
at pin CF with no fault condition present and the capacitor at that pin being charged minus
the same current at f
frequency is being decreased (by charging pin CIFB with I
the external resistor is larger, the frequency is increased (by discharging pin CIFB with
I
Current and fixed frequency control mechanisms are active at the same time. For fixed
frequency preheat using pin PH/EN, the half-bridge current sense resistor connected to
pin SLHB should be small enough not the activate the current control mechanism. If
current controlled preheat is used, pin PH/EN should be left open (except for the open
collector or open drain that drives the enable function). The preheat time t
with capacitor C
After the Preheat state the IC enters the Ignition state. During the Ignition state, the
switching frequency is decreased by charging pin CIFB with I
increasing lamp voltage until the lamp ignites (see point C in
application”) and lamp-on or f
occurs when the average absolute voltage on pin IFB is above lamp-on detection
threshold V
below the lamp-on detection threshold V
dch(CIFB)
Fig 7.
(1) Lamp voltage when lamp is off (not ignited yet).
(2) Lamp current when lamp is on.
I
).
lamp(nominal)
Resonance curve application
th(lod)(IFB)
(1)
(2)
V
V
I
lamp
lamp
ign
All information provided in this document is subject to legal disclaimers.
CPT
(2)
on pin CPT.
and the voltage on pin VFB is more than 50 % of each clock cycle
sw(low)
Rev. 2 — 15 May 2012
ph(PH/EN)
600 V fluorescent lamp driver with linear dimming function
). As long as the output current of the VCO is bigger the
sw(low)
. The output current that an external resistor R
f
sw(low)
(lowest frequency) is detected. Lamp-on detection
E
f
(1)
sw(reg)
th(lod)(VFB)
D
4
⁄
f
5
sw(ign)
of the output current of the VCO (the current
UBA2017/UBA2017A
C
f
sw(dim)
and after a delay t
H
ch(CIFB)
Figure 7 “Resonance curve
ch(CIFB)
). If the current through
f
sw(ph)
B
. This will result in
d(lod)
© NXP B.V. 2012. All rights reserved.
f
sw(high)
.
to(ph)
A
001aan202
f
can be set
ext(PH/EN)
10 of 29