BD8150KVT ROHM Co. Ltd., BD8150KVT Datasheet - Page 7

• Manufacturer Part Number: BD8150KVT
• Description: System Power Supplies Power Suuply Ic Series For Tft-lcd Panels
• Manufacturer: ROHM Co. Ltd.

•U/D selector
•VREF17
•REG
•2-bit counter
•DRV block (DC/DC converter)
•DRV (charge pump)
•Buffer Amp
•VCOM
Timing Chart
This selector switches between the step-up DC/DC and step-down DC/DC. Step-down operation is performed for high input,
and step-up operation is performed for low input.
A 1.7V reference voltage is output. This is used for the DTC setting. Perform resistance division from this voltage and set the
DTC voltage.
This is the regulator output for the gamma correction setting. Providing gamma correction resistance division under this
regulator makes it possible to obtain a stable gamma correction voltage.
A charge pump switching frequency is generated from the DC/DC converter frequency. This becomes 1/4 of the DC/DC
converter frequency.
This is a driver block that outputs the pulse between Vcc and GND. This directly drives the P-channel FET or N-channel FET.
For step-up, connect the N-channel FET, for step-down, connect the P-channel FET.
This driver block outputs the pulse between FB and GND. Feedback control is applied to the FB voltage to stabilize the
charge pump. The FB voltage only increases to the Reg Vcc voltage, so the Reg Vcc voltage is the maximum switching
amplitude.
This IC has a built-in 10channel buffer amp for gamma correction voltage generation. Using this amp allows generation of a
gamma correction voltage that is input to the source driver.
A 1-channel differential input operation amp is built-in for VCOM. Using an external bipolar Tr buffer makes it possible to
generate a VCOM voltage.
•Basic Operation
Vcc
Each output
voltage
ENABLE
5 V
SS2
3.3 V
SS1
10 V
-6 V
Fig. 20 Basic Operation
23 V
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