Read Sharp LL-T1610W (serv.man11) Service Manual online
[9] uPD72012
This is a Bus-Powered hub controller which conforms Rev.1.1. This
block is independent from the system and thus there is no need for
software control.
block is independent from the system and thus there is no need for
software control.
Inverter unit
1. Outline
1-1. Outline
The inverter unit is a lighting unit consisting of 4 cold cathode tubes,
with the brightness control function and operation stop function (20%
- 100%).
with the brightness control function and operation stop function (20%
- 100%).
1-2. Part code
RUNTZ1002MPZZ
1-3. Applicable load
4-tube CCFT incorporated in 15-inch high-brightness TFT LCD unit.
2. I/O connectors
2-1. I/O connector specification
Input (CN1)
Product name: S7B-PH-SM3 (Nihon Acchakutanshi)
Pin
Signal name
1, 2
Circuit power supply voltage Vin (+12V)
3, 4
Circuit power supply (GND)
5
Brightness control voltage Vbr input
6
N.C.
7
Operation control input Von
CCFT output high-voltage side (CN2, CN4)
Product name: SM02B-BHSS-1 (Nihon Acchakutansi)
Pin
Signal name
1
CCFT1 output (high-voltage side)
2
CCFT2 output (high-voltage side)
CCFT output low-voltage side (CN3, CN5)
Product name: SM02(4.0) B-BHS (Nihon Acchakutansi)
Pin
Signal name
1
CCFT1 output (low-voltage side)
2
CCFT2 output (low-voltage side)
3. Electric characteristics
3-1. Inverter circuit
3-1-1. Input voltage range
11.0 V - 13.2 V DC (12.0 V typ)
3-1-2. Output current (per tube)
6.0 mA (Vbr = 0 V)
2.0 mA (Vbr = 2.5 V)
3-1-3. Efficiency
more than 75%
3-1-4. Output voltage
more than 1600 V (at 0 °C and 12 V DC input)
3-1-5. Minimum starting voltage
10.0 V DC (0 °C)
3-2. Operation control input Von
OFF when Von = 0 - 0.5 V (current consumption is less than 10 mA)
ON when Von = 2.0 - Vin
3-3. Brightness control input Vbr
The tube current is the maximum when Vbr = 0 - 0.6 V (max. bright-
ness, 100%)
ness, 100%)
The tube current is the minimum when Vbr = 2.5 V (min. brightness,
20%)
20%)
3-4. Protection circuit
The protection circuit functions when the CCFT output is open or
shorted for more than 1 second.
shorted for more than 1 second.
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