DS3992 Maxim Integrated Products, DS3992 Datasheet
DS3992
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DS3992 Summary of contents
Page 1
... The DS3992 can drive multiple CCFLs per channel, making it ideal for 4- and 6-lamp LCD PC monitor and TV applications. The DS3992 uses a push-pull drive scheme to convert a DC voltage (5V to 24V) to the high voltage (300V 1400V ) AC waveform that is required to power the RMS CCFLs ...
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Two-Channel, Push-Pull CCFL Controller ABSOLUTE MAXIMUM RATINGS Voltage on V Relative to Ground.......................-0.5V to +6.0V CC Voltage on Any Leads Other Than V ..............0. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage ...
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... SYMBOL CONDITIONS f LOSC resistor ±2% over temperature LFS:TOL DS3992Z-09P/N f DSR:OSC DS3992Z-18P/N f POSC resistor ±2% over temperature DSR:TOL DS3992Z-09P / DS3992Z-18P V BMIN DS3992Z-09N / DS3992Z-18N DS3992Z-09P / DS3992Z-18P V BMAX DS3992Z-09N / DS3992Z-18N 600pF STRIKE DCB. Typical Operating Characteristics ACTIVE SUPPLY CURRENT vs. TEMPERATURE 10 ...
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Two-Channel, Push-Pull CCFL Controller (V = 5.0V +25°C, unless otherwise noted TYPICAL OPERATION AT 16V 10μs 5. 10μs 5. 10μs 2.0V LCM 10μs 2.0V OVD BURST DIMMING AT 150Hz AND 50% ...
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... Burst Dimming DPWM Oscillator Resistor Adjust. A resistor (RPOSC) to ground on this lead sets the frequency ( the burst-dimming DPWM oscillator. [R DSR:OSC ⎯ for DS3992Z-09P and DS3992Z-09N and R DS3992Z-18N]. Lamp Brightness Control. An analog voltage at this input controls the lamp brightness. See I Table 1 for details. ...
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... Two-Channel, Push-Pull CCFL Controller LOSC EXTERNAL RESISTOR LAMP FREQUENCY SET ANALOG BRIGHTNESS BRIGHT CONTROL POSC EXTERNAL RESISTOR DPWM FREQUENCY SET Figure 1. DS3992 Functional Diagram 6 _____________________________________________________________________ 4 DataSheet U .com SYSTEM ENABLE / POR DS3992 CHANNEL FAULT FAULT CHANNEL ENABLE HANDLING [20.48MHz TO 40.96MHz] [40kHz TO 80kHz] ...
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... See the Typical Operating Circuits section for more information. Block diagrams of the DS3992 are shown in Figures 1 and 2. More operating details of the DS3992 are dis- cussed on the following pages of this data sheet. ...
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... The DS3992 provides extensive fault monitoring for each channel. It can detect open-lamp, lamp overcur- rent, failure to strike, and overvoltage conditions. Figure 4 shows a flowchart of how the DS3992 controls and monitors each channel. The steps are as follows: The lamps will not turn on unless the DS3992 supply voltage is > ...
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... RUN LAMP STAGE In the case of a lamp overcurrent condition, the DS3992 will instantaneously declare the controller fault state. If either channel on the DS3992 goes into the fault state, only the faulty channel will be shut down. Once a fault state is entered, the controller will remain in that state until one of the following occurs: • ...
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Two-Channel, Push-Pull CCFL Controller efficiency and transient response of the system. Table 2 shows a transformer specification that has been utilized for a 12V inverter supply, 438mm x 2.2mm lamp design. The n-channel MOSFET must have a threshold voltage ...
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... POSC RESISTOR SET BURST DIMMING FREQUENCY 4 DataSheet U .com SVM DUAL POWER MOSFET GA1 GB1 OVD1 LCM1 DS3992 DUAL POWER MOSFET GA2 GB2 OVD2 LCM2 GND ____________________________________________________________________ Typical Operating Circuits Single Per Channel Operating Circuit INVERTER SUPPLY VOLTAGE (5V ±10% TO 24V ±10 LCM ...
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... RESISTOR SET BURST DIMMING FREQUENCY GND 12 ____________________________________________________________________ 4 DataSheet U .com Typical Operating Circuits (continued) Multi-Lamp Per Channel Operating Circuit ON = OPEN OFF/RESET = CLOSED SVM DS3992 DUAL N-CHANNEL POWER MOSFET GA GB +5V LCM 2N3904 +5V 2N3904 +5V 2N3904 OVD INVERTER SUPPLY VOLTAGE (12V ±10% TO 24V ±10 CHANNELS ...
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... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © 2006 Maxim Integrated Products is a registered trademark of Dallas Semiconductor Corporation ...