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ISL97646 Fiches technique(PDF) 9 Page - Renesas Technology Corp

No de pièce ISL97646
Description  Boost LDO VON Slice VCOM
Download  15 Pages
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Fabricant  RENESAS [Renesas Technology Corp]
Site Internet  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ISL97646 Fiches technique(HTML) 9 Page - Renesas Technology Corp

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ISL97646
FN6265 Rev 2.00
Page 9 of 15
February 8, 2016
Typical Application Diagram
Applications Information
The ISL97646 provides a complete power solution for TFT
LCD applications. The system consists of one boost converter
to generate AVDD voltage for column drivers, one logic LDO
regulator to provide voltage to logic circuit in the LCD panel,
one integrated VCOM buffer which can provide up to 400mA
peak current. This part also integrates a Gate Pulse Modulator
circuit that can help to optimize the picture quality.
Enable Control
When enable pin is pulling down, the ISL97646 is shut down
reducing the supply current to <10µA. When the voltage at
enable pin reaches 2.2V, the ISL97646 is on.
Boost Converter
Frequency Selection
The ISL97646 switching frequency can be user selected to
operate at either constant 650kHz or 1.2MHz. Lower switching
frequency can save power dissipation, while higher switching
frequency can allow smaller external components like inductor
and output capacitors, etc. Connecting FREQ pin to ground
sets the PWM switching frequency to 650MHz, or connecting
FREQ pin to VIN for 1.2MHz.
Soft-Start
The soft-start is provided by an internal 2.5µA current source to
charge the external soft start capacitor. The ISL97646 ramps
up current limit from 0A up to full value, as the voltage at SS
pin ramps from 0V to 1.2V. Hence the soft-start time is 4.8ms
when the soft-start capacitor is 10nF, 22.6ms for 47nF and
48ms for 100nF.
BOOST
GPM
CIRCUIT
VON
AVDD
VIN2
ENABLE
VGH
VDD_1
VGH_M
LX
FB
VFLK
COMP
SS
POS
NEG-
LDO
CONTROLLER
LDO_OUT
ADJ
VIN1
GND
VDPM
FREQ-
CE
RE
OUT
VLOGIC
PGND
VDD2
AGND
VIN
C1
22µF
C3
2.2nF
C4
10nF
C5
470P
R3
2k
C6
0.1µF
C7
4.7µF
2.2µF
R2
1.3k
R1
10k
C2
47µF
L1
10µH
D1
R5
10k
C10
C9 (OPTIONAL)
TO ROW DRIVER
VCOM
+4.0V
AVDD
R6
130k
R7
80k
C11
1µF
FIGURE 14. TYPICAL APPLICATION DIAGRAM


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