参数资料
| 型号： | UBA2071ATS/N1,118 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 8/35页 |
| 文件大小： | 0K |
| 描述： | IC DVR HALF BRIDGE 24-SSOP |
| 标准包装： | 1,000 |
| 类型： | CCFL/EEFL 控制器 |
| 频率： | 38 ~ 42kHz |
| 电流 - 电源： | 1.5mA |
| 电源电压： | 14V |
| 工作温度： | -25°C ~ 100°C |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | 935285777118 |
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NXP Semiconductors
UBA2071; UBA2071A
Half bridge control IC for CCFL backlighting
8.2 V DD clamp
When the UBA2071 is disabled (EN pin low) or in the stop state, the V DD clamp is
activated. The V DD clamp is an internal active zener limiting the voltage to V clamp(VDD) . It
prevents the start-up current source from charging the V DD buffer capacitor to too high a
voltage.
The maximum current that is allowed to be delivered by the start-up current source is
determined by the clamp voltage as stated in Table 6 and the maximum allowed V DD
The UBA2071A has no V DD clamp.
8.3 Enable
The UBA2071 or UBA2071A can be activated or set to standby via the EN pin. If the
voltage on the EN pin is below V th(L)(EN) , the IC will stop oscillating at the next GL high
state 2 , and most parts of the internal circuits will shut down. When the EN pin is left open,
it is pulled low by an internal bias current of I bias(EN) .
When the voltage on the EN pin comes above V th(H)1(EN) , the IC will start up in
DC blocking capacitor charging mode (see Section 8.8 ). When the voltage on the EN pin
goes over V th(H)2(EN) , the IC will start with the initial ignition frequency sweep (see
8.4 The oscillator
The UBA2071 and UBA2071A have an internal voltage controlled sawtooth oscillator, see
The IC switches GL on and GH off during one oscillator period and GL off and GH on
during the next oscillator period. This results in a half bridge voltage with a frequency
(called the switching frequency f sw from here on) of half the oscillator frequency and with a
duty cycle of exactly 50 %.
The oscillator frequency is controlled by changing the charge current at the CF pin. By
changing the frequency the lamp current is controlled. It is also used to limit the
transformer output voltage and for gradually switching the lamps on and off during PWM
dimming.
2.
When both GH and GL are low during the lamps off period of PWM dimming (so PWMD is high), the IC will wait with entering the
standby state until PWMD becomes low again and GL can be made high.
UBA2071_A_1
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 23 June 2008
8 of 35
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相关代理商/技术参数 |
参数描述 |
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| UBA2071T | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Half bridge control IC for CCFL backlighting |
| UBA2071T/N1,118 | 功能描述:显示驱动器和控制器 Half brdg control IC for CCFL bcklighting RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| UBA2071TS | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Half bridge control IC for CCFL backlighting |
| UBA2071TS/N1,118 | 功能描述:显示驱动器和控制器 Half brdg control IC for CCFL bcklighting RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| UBA2072T/N1,518 | 功能描述:显示驱动器和控制器 L-VOLT FULL-BRG CNTR IC FOR CCFL BCKLIGHT RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
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