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CAT4134 Datasheet(PDF) 9 Page - Catalyst Semiconductor |
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CAT4134 Datasheet(HTML) 9 Page - Catalyst Semiconductor |
9 / 13 page CAT4134 © 2006 Catalyst Semiconductor, Inc. 9 Doc. No. 5021 Rev. A Characteristics subject to change without notice. APPLICATION INFORMATION The typical application for the CAT4134 is in a camera-equipped cellular phone where the LEDs are used for illumination in flash mode with short duration high-current pulse and in movie mode with continuous lighter load. In movie mode, the FLASH pin is set low. Note: Hot-plugging the LEDs while the output is fully charged is not recommended. If the LEDs are disconnected, the device should first be powered-down and the output discharged before reconnecting the LEDs to the output and the LED pins. TIMING DIAGRAM LED CURRENT SETTING Flash Mode The enable EN and FLASH logic input signals control the LED current. When both the EN and FLASH inputs are high, the driver is in flash or strobe mode. In this mode, the LED1 and LED2 pin currents are set by the resistor RFLASH and are regulated to 1800 times the current in the RFLASH resistor and follows the equation: LED current = 1800 x 1.2V / RFLASH Movie Mode When the EN input is high and FLASH is low, the driver is in movie mode. In this mode, the LED1 and LED2 pin currents are set by the resistor RSET and are regulated to 360 times the current in the RSET resistor and follows the equation: LED current = 360 x 1.2V / RSET Table 1 lists the various LED currents and the asso- ciated resistor values in movie and flash modes. Table 1. Resistor Selection in Movie and Flash Mode Movie Mode Flash Mode LED Current (mA) RSET (kΩ) LED Current (mA) RFLASH (kΩ) 5 86.4 50 43.2 10 43.2 75 28.8 20 21.6 100 21.6 30 14.4 150 14.4 Shutdown Mode When the EN input is low, the driver is in shutdown mode and there is no current flowing in either LED1 or LED2 pins. EN FLASH LED1, LED2 Current movie mode movie mode flash mode |
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