[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.
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%).
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%)
The tube current is the minimum when Vbr = 2.5 V (min. brightness,
20%)
3-4. Protection circuit
The protection circuit functions when the CCFT output is open or
shorted for more than 1 second.
