UBA2017P/1,112 NXP Semiconductors, UBA2017P/1,112 Datasheet - Page 12

• 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
Fig 8.
I
lamp
R ext(IFB)
DIM input is only present in the UBA2017A
Lamp current control
DIM
IFB
VDD
R i(IFB)
I bias(DIM)
The output of the OTA is connected to pin CIFB. The external capacitor C
charged and discharged according to the voltage on the OTA inputs and the
transconductance of the OTA, g
I
More components can be connected to pin CIFB to improve the response time and
stability of the lamp current control loop.
Pin CIFB is connected to the input of the VCO (Voltage Controlled Oscillator) that
determines the frequency of the IC. Pin CIFB voltage is inversely proportional to the
switching frequency. When the load is inductive, an increase in frequency decreases the
lamp current, and a decrease in frequency increases the lamp current. With the closed
loop for the lamp current in place, the IC will regulate to the required frequency for the
desired lamp current. So when the IC enters the Burn state it will go to either point D or H
shown in
DOUBLE SIDE
RECTIFIER
CIFB
= g
V reg(ref)
m(IFB)
Figure 7
× (V
All information provided in this document is subject to legal disclaimers.
VDD
IFB
depending on the DIM input voltage or V
− V
Rev. 2 — 15 May 2012
reg(IFB
600 V fluorescent lamp driver with linear dimming function
).
m(IFB)
VOLTAGE
CONTROLLED
OSCILLATOR
VDD
according to the formula:
I ch(low)(CF)
CF
C ext(CF)
UBA2017/UBA2017A
OTA
g m(IFB)
VDD
VOLTAGE
CONTROLLED
CURRENT SOURCE
/ 2
reg(ref)
V high(CF)
clock
.
aaa-001481
© NXP B.V. 2012. All rights reserved.
ext(CIFB)
CIFB
C ext(CIFB)
is
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