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CAT4134
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.
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
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.
EN
1.2 V
RSET
Table 5 lists the various LED currents and the associated
resistor values in movie and flash modes.
Table 5.
RESISTOR SELECTION IN MOVIE AND FLASH MODE
FLASH
Movie Mode
LED Current
RSET
Flash Mode
LED Current RFLASH
LED1, LED2
Current
movie
mode
flash
mode
movie
mode
(mA)
5
10
(k W )
86.4
43.2
(mA)
50
75
(k W )
43.2
28.8
20
21.6
100
21.6
Figure 16. Timing Diagram
30
14.4
150
14.4
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:
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.
LED current + 1800
1.2 V
RFLASH
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