UBA2017P/1,112 NXP Semiconductors, UBA2017P/1,112 Datasheet - Page 10

• 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
7.3.5 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