UBA2017P/1,112 NXP Semiconductors, UBA2017P/1,112 Datasheet - Page 13

• 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
7.3.7.2 Operation without lamp current control
7.3.8 Stop state
7.5.1 End-of-life rectifying lamp detection
7.5.2 End-of-life overvoltage detection
7.4 Enable and Disable
7.5 Protection circuits
However, the switching frequency can never go below f
reached at f
To operate the lamp without current control the lamp current sense, pin IFB must be
connected to ground. The lamp now operates at the lowest frequency f
Figure
When in the Stop state, the IC is off and all driver outputs are low. The IC will remain in the
Stop state until the voltage on pin VDD drops below V
case it will go to the Reset state.
The sequence of events for entering the Stop state are shown in
The enable function works via pin PH/EN. If this pin is pulled below the enable voltage
V
will continue its normal clock cycle until GLHB is high and then go to the Standby state).
The external interface with pin PH/EN for the enable signal should be an open collector or
open drain type driver. To enable the IC, the open collector or open drain should be open
(high ohmic) to not disturb the fixed frequency preheat setting function of pin PH/EN.
In the Restart, Standby and Stop states, the standby pull-up current source I
will pull the voltage at pin PH/EN above V
states, the normal output voltage driver of the IC will pull the pin high. In those cases, the
external driver must draw a current I
If voltage on pin EOL is below low threshold voltage V
fault timer will start.
A programmable end-of-life window is achieved by the internal bias current sink I
The effective relative size of the EOL window will decrease in line with the increasing
series resistance connected to pin EOL.
The end-of-life lamp rectifying detection is only active during the Burn state.
This protection is intended to protect against symmetrical lamp aging. When in the Burn
state, the voltage on pin VFB exceeds the overvoltage end-of-life threshold voltage
V
V
on the voltage on pin DIM (see
according to the formula
Parameters a and b can be calculated from the V
en(PH/EN)
th(oveol)(VFB)
th(oveol)(VFB)
7). Dimming is not supported in this case.
, the IC goes into the Standby state (immediately if GLHB is high, otherwise it
sw(low)
by more than 50 % of each switching cycle the fault timer will start.
is related to the regulation voltage on pin IFB V
All information provided in this document is subject to legal disclaimers.
the IC will stay at f
Rev. 2 — 15 May 2012
V
600 V fluorescent lamp driver with linear dimming function
th oveol
(
Section 7.3.7.1 “Lamp current control and
) VFB
(
clamp(PH/EN)
sw(low)
)
=
en(PH/EN)
a b
(point E in
–
UBA2017/UBA2017A
×
from the pin to disable the IC.
V
th(oveol)(VFB)
. In the Preheat, Ignition and Burn
reg IFB
(
rst(VDD)
Figure
th(low)EOL
sw(low)
)
:
reg(IFB)
. If the regulation level is not
values given in
7).
or it is disabled, in which
or above V
Figure 6 “State
that itself is dependent
sw(low)
© NXP B.V. 2012. All rights reserved.
dimming”)
th(high)EOL,
pu(stb)(PH/EN)
Table
(point E in
diagram”.
bias(EOL)
6.
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the
.