ISL97645AIRZ 데이터 시트보기 (PDF) - Renesas Electronics
부품명
상세내역
일치하는 목록
ISL97645AIRZ Datasheet PDF : 16 Pages
| |||
ISL97645A
Functional Block Diagram
VIN
VIN
COMP
SS
VSHDN
FREQ-
VDPM
VFLK
CE
RE
POS
NEG-
VIN
RESET
AGND
GND
BOOST
GPM
CIRCUIT
REF
LX
FB
PGND
VON
VGH
VDD1
AVDD
VGH_M
VDD2
OUT
VGATE
CD2
VIN
VDIV
FIGURE 13. FUNCTIONAL BLOCK DIAGRAM
Applications Information
The ISL97645A provides a complete power solution for TFT
LCD applications. The system consists of one boost converter
to generate AVDD voltage for column drivers, one integrated
VCOM buffer which can provide up to 400mA peak current, and
one supply monitor to generate the reset signal when the input
voltage is low. This part also integrates Gate Pulse Modulator
circuit that can help to optimize the picture quality.
Enable Control
When enable pin is pulling down, the ISL97645A is shut down
reducing the supply current to <10µA. When the voltage at
enable pin reaches 2.2V, the ISL97645A is on.
Boost Converter
Frequency Selection
The ISL97645A 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 the FREQ pin to GND
sets the PWM switching frequency to 650kHz, 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 ISL97645A ramps
up current limit from 0A up to full value, as the voltage at SS
pin ramps from 0 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.
FN6353 Rev 1.00
October 21, 2010
Page 9 of 16
Share Link: 