1. OUTLINE
1.1 STRUCTURE AND PRINCIPLE
104PW191 inverter for LCD (Liquid crystal display) modules is composed of a DC/AC inversion circuit, a luminance control circuit and a boosting transformer.
The DC/AC inversion circuit inverts a direct current (DC) power supply into an altar current (AC) by the center-tap transmitter circuit that used transistors.
The luminance control circuit can control the luminance of cold cathode lamps for LCD backlight unit.
The boosting transformer is translated the low AC voltage that obtained from a DC/AC inversion circuit to the high AC voltage. Also the high AC voltage is outputted from a secondary side of the boosting transformer.
1.2 APPLICATIONS
· High AC voltage generator of cold cathode fluorescent lamp for LCD
1.3 FEATURES
· Pulse width modulation circuit
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2. DETAILED SPECIFICATIONS
2.1 MECHANICAL SPECIFICATIONS
| Parameter | Specification | Unit |
| Board size | 105.0 ± 0.5 (W) ´ 26.5 ± 0.5 (H) ´ 10.0 ± 0.5 (D) Note1 | mm |
| Weight | 20.0 (typ.), 23.0 (max.) | g |
2.2 ABSOLUTE MAXIMUM RATINGS
| Parameter | Symbol | Rating | Unit | Remarks |
| Combined load | Resistance | RL | 90 | kW | Ta = 25°C |
| Stray capacity | CL | 5 | pF |
| Input voltage | Power supply for inverter | VDDB | 0 to +15.0 | V |
| BRTI signal | VBI | -0.3 to +15.0 | V |
| BRTC signal | VBC | -0.3 to +15.0 | V |
| Storage temperature | Tst | -30 to +85 | °C | - |
| Operating temperature | Front surface | TopF | -10 to +70 | °C |
| Rear surface | TopR | -10 to +70 | °C |
| Relative humidity Note1 | RH | £ 95 | % | Ta £ 40°C |
| £ 85 | % | 40 < Ta £ 50°C |
| £ 70 | % | 50 < Ta £ 55°C |
| £ 60 | % | 55 < Ta £ 60°C |
| £ 50 | % | 60 < Ta £ 65°C |
| £ 42 | % | 65 < Ta £ 70°C |
| Absolute humidity Note1 | - | £ 78 Note2 | g/m3 | Ta > 70°C |
Note1: No condensation
Note2: Ta = 70°C, RH = 42%
2.3 ELECTRICAL CHARACTERISTICS
| Parameter | Symbol | Min. | Typ. | Max. | Unit | Remarks |
| Combined load | Resistance | RL | - | 85 | 90 | kW | - |
| Stray capacity | CL | - | 5 | - | pF |
| Input voltage | Power supply for inverter | VDDB | 10.8 | 12.0 | 13.2 | V |
| BRTI signal | VBI | 0 | - | 2.5 | V |
| BRTC signal | Low | VBCL | 0 | - | 0.8 | V | at inverter power OFF |
| High | VBCH | 2.0 | - | VDDB | V | at inverter power ON |
| Input current | Power supply for inverter | IDDB | - | 530 | 750 | mA | at maximum luminance, VDDB = 12.0V Note1 |
| Output voltage | Power supply for LCD lamp | VS | 1,150 | 1,250 | 1,500 | Vrms | Starting voltage for lamp, RL = ¥, CL = ¥ |
| Output current | LCD lamp | IBL | 4.5 | 5.0 | 5.5 | mArms | - |
| Oscillation frequency | FO | 60 | 65 | 70 | kHz |
| Luminance control frequency for LCD lamp | FL | 240 | 270 | 300 | Hz |
Note1: The power supply lines (VDDB and GNDB) occurs large ripple voltage while luminance control of LCD lamps.
There is the possibility that the ripple voltage produces acoustic noise and signal wave noise in audio circuit and so on.
Put a capacitor (5,000 to 6,000mF) between the power source lines (VDDB and GNDB) to reduce the noise,
if the noise occurred in the circuit.
Product Tags:
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NEC 104PW191 LCD CCFL Power Inverter Original New Condition For Electronic Component Images
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