Electronic Components Datasheet Search |
|
ISL97645 Datasheet(PDF) 8 Page - Intersil Corporation |
|
ISL97645 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 14 page 8 FN9263.1 December 14, 2007 Typical Application Diagram Applications Information The ISL97645 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. 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 ISL97645 is shut down reducing the supply current to <10µA. When the voltage at enable pin reaches 2.2V, the ISL97645 is on. Boost Converter Frequency Selection The ISL97645 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 ISL97645 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. Operation The boost converter is a current mode PWM converter operating at either a 650kHz or 1.2MHz. It can operate in both discontinuous conduction mode (DCM) at light load and FIGURE 12. TYPICAL APPLICATION DIAGRAM BOOST GPM CIRCUIT VON AVDD ENABLE VGH VDD_1 VGH_M LX FB VFLK COMP SS POS TO ROW DRIVER NC NC VIN GND VDPM FREQ- CE RE PGND VDD2 AGND VIN C1 22µF C3 2.2nF C4 10nF S1 S2 S3 C5 470P R3 2K C6 0.1µF 0.47µF R2 1.3K R1 10K C2 47µF L1 10µH D1 NEG- OUT VCOM +4.0V AVDD R7 80k C11 1µF R6 130k ISL97645 |
Similar Part No. - ISL97645 |
|
Similar Description - ISL97645 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |