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ISL97644IRZ Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL97644IRZ Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 15 page 9 FN9228.0 April 11, 2006 Typical Application Diagram Applications Information The ISL97644 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 Gate Pulse Modulator circuit that can help to optimize the picture quality. Enable Control When enable pin is pulling down, the ISL97644 is shut down reducing the supply current to <10µA. When the voltage at enable pin reaches 2.2V, the ISL97644 is on. Boost Converter Frequency Selection The ISL97644 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 ISL97644 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. 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 FIGURE 14. TYPICAL APPLICATION DIAGRAM C9 (OPTIONAL) TO ROW DRIVER VCOM +4.0V AVDD R6 130k R7 80k C11 1µF ISL97644 |
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