NEC 104PW161 POWER INVERTER

104PW161 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.

APPLICATIONS

  • High AC voltage generator of cold cathode fluorescent lamp for LCD

FEATURES

  • Pulse width modulation circuit
  • Alert circuit for malfunction
  • MECHANICAL SPECIFICATIONS
ParameterSpecificationUnit
Board size105.0 ± 0.5 (W) ´ 26.5 ± 0.5 (H) ´ 9.5 ± 0.5 (D) Note1mm
Weight20.0 (typ.), 23.0 (max.)g

Note1: See “5.OUTLINE DRAWINGS“.

  • ABSOLUTE MAXIMUM RATINGS
ParameterSymbolRatingUnitRemarks
 Combined loadResistanceRL105kW   Ta = 25°C
Stray capacityCL5pF
  Input voltagePower supply for inverterVDDB0 to +14.0V
BRTI signalVBI0 to +16.0V
BRTC signalVBC-1.0 to VDDB+1.0V
Storage temperatureTst-30 to +85°C  –
 Operating temperatureFront surfaceTopF-10 to +70°C
Rear surfaceTopR-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£ 78Note2g/m3Ta > 70°C

Note1: No condensation Note2: Ta = 70°C, RH = 42%

  • Driving for inverter(Ta = 25°C)
ParameterSymbolMin.Typ.Max.UnitRemarks
 Combined loadResistanceRL95100105kW   –
Stray capacityCL5pF
   Input voltagePower supply for inverterVDDB10.812.013.2V
BRTI signalVBI02.5V
 BRTC signalLowVBCL00.4Vat inverter power OFF
HighVBCH2.5VDDBVat inverter power ON
Input currentPower supply for inverterIDDB550750mAat maximum luminance, VDDB = 12.0V Note1
  Output voltagePower supply for LCD lampVS1,2001,2501,500VrmsStarting voltage for lamp,RL = ¥, CL = ¥
 AM signalLowVBA00.5Vat normal
HighVBA4.55.05.5Vat malfunction
Output currentLCD lampIBL4.55.05.5mArms  –
Oscillation frequencyFO505560kHz
Luminance control frequency for LCD lampFL220250280Hz

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.

  • Fuses
Fusing lineFuseRatingUnitRemark
TypeSupplier
 VDDB CCP2E15H KOA Corporation1.5AFusing current Note1
72V

Note1: The power capacity should be more than the fusing current rating. If the power capacity is less than the criteria value, the fuse may not blow, and then nasty smell, smoking and so on may occur.

  • CONNECTIONS AND FUNCTIONS FOR INTERFACE PINS
  • Detail of interface pins

CN1 socket: 53261-0890 (MOLEX Inc.)

Adaptable plug: 51021-0800 (MOLEX Inc.)

Pin No.SymbolFunctionRemarks
1VDDBPower supply –
2VDDBPower supply
3GNDBGround
4GNDBGround
5BRTCInverter ON/OFF signalON: High or Open, OFF: Low
6BRTIInput of luminance control by resistor / voltage control methodNote1
7GNDBGround
8AMAlert for malfunction signal5.0V output at malfunction

Note1: See “2.5 LUMINANCE CONTROLS”.

CN2 socket: SM03 (4.0) B-BHS-TB (J.S.T. Mfg Co., Ltd.)

Adaptable plug: BHR-03VS-1 (J.S.T. Mfg Co., Ltd.)

CN1: Figure of socket

Pin No.SymbolSignalRemarks
1VBLCLow voltage (Cold) –
2VBLHHigh voltage (Hot)
3VBLHHigh voltage (Hot)

CN2: Figure of socket

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