JBT6K49-AS Datasheet, PDF (6/14 Pages) Toshiba Semiconductor – Power supply IC for TFT LCD Panels

Pin Function Description (1)
JBT6K49-AS
Pin Name
CKSEL
EXTCK
FSEL1
FSEL2
I/O
Function
I
External clock pulse selection pin
CKSEL = “L”・・・the built-in oscillator is used.
CKSEL = “H”・・・an external clock pulse is accepted. It must be input on the EXTCK pin.
I/O External clock pulse input pin
Input an external clock pulse on this pin if External Clock Pulse Supply Mode has been
selected. If the built-in oscillator is selected (Self-Oscillation Mode), this pin must be fixed Low.
I
Oscillation frequency switching input pins
These pins can be used to select the oscillation frequency for the DC-DC converters.
FSEL2
0
0
1
1
FSEL1
0
1
0
1
DC-DC converter clock frequency
(typ.)
3.5 kHz
5.0 kHz
7.5 kHz
10.0 kHz
CA1+､CA1-
CA2+､CA2-
V_SOUT1
V_SOUT2
V_SIN
V_REFIN
V_REF
I/O DC-DC converter 1 capacitor connection pins
These pins can be connected to voltage booster capacitors. The recommended capacitance for
the DC-DC converter capacitors is 1 mF.
O DC-DC converter 1 output pins
These pins output the supply voltage (AV_DD) for the T6K47. They are electrically connected via
an aluminum wire inside the IC chip.
Normally a capacitor with a capacitance of approximately 10 mF is connected across the V_SS
pins in order to maintain the voltage level.
I
DC-DC converter 1 power supply input pin
This is the power supply feedback pin for DC-DC converter 1. It is normally connected to the
V_SOUT1 pin.
I
Reference voltage input pin
An operational-amplifier output feedback voltage is input on this pin to generate the VS voltage.
It should normally be connected to the V_REF pin.
O Reference power supply output pin
This is an operational-amplifier output pin which generates the VS voltage. It is normally
connected to a capacitor with a capacitance of 0.1 mF to 0.47 mF. The capacitance should be
adjusted as necessary to suit the conditions in which the device is used.
6
2002-03-12