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ADM8845 датащи(PDF) 16 Page - Analog Devices

номер детали ADM8845
подробное описание детали  Charge Pump Driver for LCD White LED Backlights
PDF  20 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

ADM8845 датащи(HTML) 16 Page - Analog Devices

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ADM8845
Rev. 0 | Page 16 of 20
DRIVING FOUR BACKLIGHT WHITE LEDS AND FLASH LEDS
The ADM8845 also can be configured to power four backlight
white LEDs and a camera flash, packaged into one package. FB1
to FB4 power the backlight light, FB5 and FB6 powers the two
of the flash LEDs, and the third is powered an external current
mirror to control the current flowing through the third flash LED
(see Figure 33). All the backlight white LEDs have 15 mA/LED,
and the flash current is 20 mA/LED. The total load on the
ADM8845 charge pump is 120 mA; the maximum load on
the ADM8845 charge pump is 180 mA (see Figure 21).
CTRL1 controls the flash on/off, and CTRL2 controls the back-
light on/off and brightness control. Because the RSET resistor sets
the current that each of the six current control blocks can sink,
a PWM signal is used to change the current in the backlight
from 20 mA to 5 mA/LED. The CTRL2 duty cycle is 15/20 to
give 15 mA/backlight LED.
CONTROL
LOGIC
VREF
CHARGE PUMP
1×/1.5×/2× MODE
OSC
LED
CURRENT
CONTROL
CIRCUIT
FB1
CURRENT CONTROLLED SINKS
FB2
FB3
FB4
FB5
FB6
VOUT
C4
4.7
µF
VCC
CTRL1
CTRL2
C2
1
µF
C1
1
µF
RSET
7.32k
Ω
ISET
GND
C3
2.2
µF
ADM8845
15mA/LED
20mA/LED
CURRENT
CONTROL 7
R
BACK-
LIGHT
FLASH
Figure 33. Driving Four Backlight LEDs and Flash LED



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