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UBA2074 の電気的特性と機能

UBA2074のメーカーはNXP Semiconductorsです、この部品の機能は「High Voltage Full-bridge control IC」です。


製品の詳細 ( Datasheet PDF )

部品番号 UBA2074
部品説明 High Voltage Full-bridge control IC
メーカ NXP Semiconductors
ロゴ NXP Semiconductors ロゴ 




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UBA2074 Datasheet, UBA2074 PDF,ピン配置, 機能
UBA2074(A)
High Voltage Full-bridge control IC for CCFL backlighting
Rev. 02.0 — February 2007
Preliminary data sheet
1. General description
The UBA2074 is a high voltage IC intended to drive Cold Cathode Fluorescent Lamps
(CCFLs) for back-lighting applications. The IC contains level-shifters, bootstrap diodes
and drivers for the external full-bridge power switches.
Furthermore, the UBA2074 has a build-in HF oscillator which determines the operating
frequency, a phase shift controller for obtaining constant lamp current, and a PWM
generator which is used to set the brightness level of the CCFLs.
Multiple inverters can be synchronized to a single operating frequency, while maintaining
constant lamp current. Also, PWM dimming can be synchronized by either using the
internal PWM generator, or by using an externally applied PWM signal.
The UBA2074 is designed to operate in a very wide inverter supply voltage range. The IC
can be configured to be supplied directly from a low voltage supply up to 30 V DC. The
fullbridge voltage can range up to 550V.
The A-version has no hardswitching protection in order to suit medium voltage (e.g 60V)
full bridge systems.
2. Features
Suitable for operating in a very wide inverter supply voltage range (up to 550 V DC for
SO28 package, up to 225 V for SSOP28 package)
Wide IC supply voltage range (9 V to 30 V DC)
Suitable for synchronizing multiple inverters to a single operating frequency with equal
lamp current phase
Adjustable maximum fault timing
Integrated level-shifters
Integrated bootstrap diodes
Lamp current control
Over-voltage control
Over-current protection
Ignition failure detection
Hard-switching control (not in the A-version)
Arcing detection
Brightness level adjustment through PWM dimming
Integrated PWM generator
Free Datasheet http://www.datasheet4u.net/

1 Page





UBA2074 pdf, ピン配列
NXP Semiconductors
5. Block diagram
UBA2074(A)
High Voltage Full-bridge control IC for CCFL backlighting
Fig 1. Block diagram UBA2074(A) (Shaded circuit not present in the UBA2074A).
UBA2074(A)
Preliminary data sheet
Rev. 02.0 — February 2007
© NXP B.V. 2007. All rights reserved.
3 of 33
Free Datasheet http://www.datasheet4u.net/


3Pages


UBA2074 電子部品, 半導体
NXP Semiconductors
UBA2074(A)
High Voltage Full-bridge control IC for CCFL backlighting
7. Functional description
The UBA2074 is designed to drive a full-bridge inverter with resonant load. The load
consists typically of transformers with CCFLs. Two parameters are used by the UBA2074
to control the switches of the full-bridge inverter: the phase shift and the switching
frequency.
The two full bridge halves A and B (Figure 3) always operate at the same switching
frequency. The frequency is used to control transformer output voltage during the first
ignition of the lamps. The phase difference between the full-bridge halves A and B
voltages (VA and VB) controls the lamp current, as this determines the rms value of the
full-bridge inverter voltage VA - VB (Figure 4).
Fig 3. Full-bridge inverter definition
Fig 4. Full-bridge inverter voltage and definition of phase shift
UBA2074(A)
Preliminary data sheet
Rev. 02.0 — February 2007
© NXP B.V. 2007. All rights reserved.
6 of 33
Free Datasheet http://www.datasheet4u.net/

6 Page



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